26 results on '"Maria Gabriela Figueiro Longo"'
Search Results
2. MarkIt: A Collaborative Artificial Intelligence Annotation Platform Leveraging Blockchain For Medical Imaging Research
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Jan Witowski, Jongmun Choi, Soomin Jeon, Doyun Kim, Joowon Chung, John Conklin, Maria Gabriela Figueiro Longo, Marc D. Succi, and Synho Do
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artificial intelligence ,data annotation ,learning from crowds ,blockchain ,rewarding system ,Computer applications to medicine. Medical informatics ,R858-859.7 - Abstract
Current research on medical image processing relies heavily on the amount and quality of input data. Specifically, supervised machine learning methods require well-annotated datasets. A lack of annotation tools limits the potential to achieve high-volume processing and scaled systems with a proper reward mechanism. We developed MarkIt, a web-based tool, for collaborative annotation of medical imaging data with artificial intelligence and blockchain technologies. Our platform handles both Digital Imaging and Communications in Medicine (DICOM) and non-DICOM images, and allows users to annotate them for classification and object detection tasks in an efficient manner. MarkIt can accelerate the annotation process and keep track of user activities to calculate a fair reward. A proof-of-concept experiment was conducted with three fellowship-trained radiologists, each of whom annotated 1,000 chest X-ray studies for multi-label classification. We calculated the inter-rater agreement and estimated the value of the dataset to distribute the reward for annotators using a crypto currency. We hypothesize that MarkIt allows the typically arduous annotation task to become more efficient. In addition, MarkIt can serve as a platform to evaluate the value of data and trade the annotation results in a more scalable manner in the future. The platform is publicly available for testing on https://markit.mgh.harvard.edu.
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- 2021
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3. An artificial intelligence‐accelerated 2‐minute multi‐shot echo planar imaging protocol for comprehensive high‐quality clinical brain imaging
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Bryan Clifford, John Conklin, Susie Y. Huang, Thorsten Feiweier, Zahra Hosseini, Augusto Lio M. Goncalves Filho, Azadeh Tabari, Serdest Demir, Wei‐Ching Lo, Maria Gabriela Figueiro Longo, Michael Lev, Pam Schaefer, Otto Rapalino, Kawin Setsompop, Berkin Bilgic, and Stephen Cauley
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Diffusion Magnetic Resonance Imaging ,Artificial Intelligence ,Echo-Planar Imaging ,Image Processing, Computer-Assisted ,Brain ,Humans ,Neuroimaging ,Radiology, Nuclear Medicine and imaging - Abstract
We introduce and validate an artificial intelligence (AI)-accelerated multi-shot echo-planar imaging (msEPI)-based method that provides T1w, T2w,The rapid imaging technique combines a novel machine learning (ML) scheme to limit g-factor noise amplification and improve SNR, a magnetization transfer preparation module to provide clinically desirable contrast, and high per-shot EPI undersampling factors to reduce distortion. The ML training and image reconstruction incorporates a tunable parameter for controlling the level of denoising/smoothness. The performance of the reconstruction method is evaluated across various acceleration factors, contrasts, and SNR conditions. The 2-minute protocol is directly compared to a 10-minute clinical reference protocol through deployment in a clinical setting, where five representative cases with pathology are examined.Optimization of custom msEPI sequences and protocols was performed to balance acquisition efficiency and image quality compared to the five-fold longer clinical reference. Training data from 16 healthy subjects across multiple contrasts and orientations were used to produce ML networks at various acceleration levels. The flexibility of the ML reconstruction was demonstrated across SNR levels, and an optimized regularization was determined through radiological review. Network generalization toward novel pathology, unobserved during training, was illustrated in five clinical case studies with clinical reference images provided for comparison.The rapid 2-minute msEPI-based protocol with tunable ML reconstruction allows for advantageous trade-offs between acquisition speed, SNR, and tissue contrast when compared to the five-fold slower standard clinical reference exam.
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- 2021
4. Low-Level Light Therapy Effect on Resting-State Connectivity in Patients Following Moderate Traumatic Brain Injury
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Suk-tak Chan, Nathaniel Mercaldo, Maria Gabriela Figueiro Longo, Jonathan Welt, Arman Avesta, Jacqueline Namati, Jarone Lee, Michael Lev, Eva-Maria Ratai, Michael Wenke, Blair Parry, Lynn Drake, Richard Anderson, Terry Rauch, Ramon Diaz-Arrastia, Kenneth Kwong, Michael Hamblin, Benjamin Vakoc, and Rajiv Gupta
- Abstract
Recent studies demonstrate that low-level light therapy (LLLT) modulates recovery in patients with traumatic brain injury (TBI). However, the impact of LLLT on brain activity following TBI has not been well described. Here we use a randomized, double-blind, placebo-controlled design to investigate the effect of LLLT on resting-state connectivity at acute (within 1-week), subacute (2–3 weeks), and late-subacute (3-month) time-points following moderate TBI. A characteristic connectivity profile was observed during TBI recovery in both sham- (n = 21) and LLLT-treated patients (n = 17) compared to healthy controls, with increased resting-state connectivity between frontal and parietal cortices. Temporal comparisons between LLLT- and sham-treated patients showed that the acute-to-subacute changes in resting-state connectivity were significantly greater in LLLT-treated patients. These results demonstrate that LLLT increased resting-state connectivity in the presence of a regional hyperconnectivity response to moderate TBI, suggesting that LLLT can modulate activity in the injured brain and encouraging its further exploration as a therapy for TBI.
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- 2022
5. Pediatric Emergency MRI
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Maria Gabriela Figueiro Longo, Camilo Jaimes, Fedel Machado, Jorge Delgado, and Michael S. Gee
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Humans ,Radiology, Nuclear Medicine and imaging ,Child ,Emergency Service, Hospital ,Tomography, X-Ray Computed ,Magnetic Resonance Imaging - Abstract
There is an overall increase in the use of imaging in the pediatric emergency room setting, which is accompanied by a reduction in computed tomography examinations performed mainly due to the increased awareness of the risks of ionizing radiation. Advances in MRI technology have led to shortened scan time, decreased motion sensitivity, and improved spatial resolution. With increased access to MRI in the emergency room setting, the goal of this article is to review major applications of MR in pediatric emergency room patients.
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- 2022
6. Comparison of ultrafast wave-controlled aliasing in parallel imaging (CAIPI) magnetization-prepared rapid acquisition gradient echo (MP-RAGE) and standard MP-RAGE in non-sedated children: initial clinical experience
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Stephen F. Cauley, Paul J Caruso, Otto Rapalino, John Conklin, Michael S. Gee, Susie Y. Huang, John E. Kirsch, Kawin Setsompop, Camilo Jaimes, Azadeh Tabari, and Maria Gabriela Figueiro Longo
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Artifact (error) ,medicine.diagnostic_test ,business.industry ,media_common.quotation_subject ,Ultrasound ,Magnetic resonance imaging ,Noise ,Neuroimaging ,Pediatrics, Perinatology and Child Health ,medicine ,Image noise ,Contrast (vision) ,Radiology, Nuclear Medicine and imaging ,business ,Nuclear medicine ,human activities ,Neuroradiology ,media_common - Abstract
Fast magnetic resonance imaging (MRI) sequences are advantageous in pediatric imaging as they can lessen child discomfort, decrease motion artifact and improve scanner availability. To evaluate the feasibility of an ultrafast wave-CAIPI (controlled aliasing in parallel imaging) MP-RAGE (magnetization-prepared rapid gradient echo) sequence for brain imaging of awake pediatric patients. Each MRI included a standard MP-RAGE sequence and an ultrafast wave-MP-RAGE sequence. Two neuroradiologists evaluated both sequences in terms of artifacts, noise, anatomical contrast and pathological contrast. A predefined 5-point scale was used by two independent pediatric neuroradiologists. A Wilcoxon signed-rank test was used to evaluate the difference between sequences for each variable. Twenty-four patients (14 males; mean age: 11.5±4.5 years, range: 1 month to 17.8 years) were included. Wave-CAIPI MP-RAGE provided a 77% reduction in scan time using a 32-channel coil and a 70% reduction using a 20-channel coil. Visualization of the pathology, artifacts and pathological enhancement (including parenchymal, leptomeningeal and dural enhancement) was not significantly different between standard MP-RAGE and wave-CAIPI MP-RAGE (all P>0.05). For central (P
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- 2021
7. 'All-in-one' window/level whole-body computed tomography scan - A faster way to evaluate trauma cases
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Maria Gabriela Figueiro Longo, Pieter Vuylsteke, Can Ozan Tan, Joris A.M. Soons, Laura Avery, Marc D. Succi, Vinit Baliyan, Ali Pourvaziri, Limin Xu, Daniel Chonde, Michael Lev, Jeroen Cant, and Rajiv Gupta
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Abdomen ,Emergency Medicine ,Humans ,Whole Body Imaging ,General Medicine ,Thorax ,Tomography, X-Ray Computed ,Retrospective Studies - Abstract
To investigate the accuracy and total assessment time (TAT) of the "All-in-one" (AIO)-window/level setting for whole-body computed tomography (CT) image compared to multiple tissue-specific window/level settings conventionally used for detection of traumatic injuries.Contrast-enhanced chest, abdomen, and pelvic CT scans of 50 patients who presented to our emergency department (ED) for major trauma were retrospectively selected. In a simulation of a "wet read" performed at the CT scanner console, 6 readers with different levels of experience had up to 3 min to describe any traumatic finding identified on the CTs. The readers reviewed each patient in two different sessions separated by a washout period to suppress any recall bias from one session to the next. Each scan was reviewed once using the AIO-window/level setting and another time using the conventional bone, lung, and soft tissue window/level display settings, in a randomized order. The CT reports were used as reference standard.Overall, there was no statistically significant difference in the assessment accuracy of the review based on the AIO or the conventional window/level settings (0.89 ± 0.09 vs 0.90 ± 0.08). Using the AIO-window/level settings, TAT was 14.3 s faster when compared with the conventional window/level settings (2.33 ± 0.63 vs 2.57 ± 0.51 min; p0.001).In a time-delimited image review, similar diagnostic accuracy was reached faster using the AIO vs the conventional window/level settings. When providing a "wet read" at the CT console, the ability to identify traumatic injury using a single AIO-window/level may help expedite patient management.
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- 2022
8. Determinants of cerebral radiological progression in Fabry disease
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Carla E. M. Hollak, Marcel G. W. Dijkgraaf, Marjana R. Lima, Mirjam Langeveld, Ivo N. van Schaik, Maria Gabriela Figueiro Longo, Simon Körver, Leonardo Vedolin, Mohamed El Sayed, Endocrinology, Graduate School, AGEM - Inborn errors of metabolism, ANS - Neuroinfection & -inflammation, Epidemiology and Data Science, APH - Methodology, and ACS - Diabetes & metabolism
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,Renal function ,Infarction ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,medicine ,Humans ,Young adult ,Child ,Aged ,030304 developmental biology ,0303 health sciences ,medicine.diagnostic_test ,business.industry ,Brain ,Atrial fibrillation ,Magnetic resonance imaging ,Enzyme replacement therapy ,Middle Aged ,medicine.disease ,Magnetic Resonance Imaging ,White Matter ,Fabry disease ,Hyperintensity ,Psychiatry and Mental health ,Disease Progression ,Cardiology ,Fabry Disease ,Female ,Surgery ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,Follow-Up Studies - Abstract
Background and aimIt is unclear which patients with Fabry disease (FD) are at risk for progression of white matter lesions (WMLs) and brain infarctions and whether enzyme replacement therapy (ERT) changes this risk. The aim of this study was to determine the effect of ERT and clinical characteristics on progression of WMLs and infarctions on MRI in patients with FD.MethodsMRIs were assessed for WMLs (Fazekas scale), infarctions and basilar artery diameter (BAD). The effect of clinical characteristics (renal and cardiac involvement, cardiovascular risk factors, cardiac complications, BAD) and ERT on WML and infarction progression was evaluated using mixed models.ResultsOne hundred forty-nine patients were included (median age: 39 years, 38% men, 79% classical phenotype). Median follow-up time was 7 years (range: 0–13 years) with a median number of MRIs per patient of 5 (range: 1–14), resulting in a total of 852 scans. Variables independently associated with WML and infarction progression were age, male sex and a classical phenotype. Progression of WMLs and infarctions was not affected by adding ERT to the model, neither for the whole group, nor for early treated patients. Progression was highly variable among patients which could not be explained by other known variables such as hypertension, cholesterol, atrial fibrillation and changes in kidney function, left ventricular mass or BAD.ConclusionProgression of WMLs and cerebral infarctions in FD is mainly related to age, sex and phenotype. Additional effects of established cardiovascular risk factors, organ involvement and treatment with ERT are probably small to negligible.
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- 2020
9. Depressive symptoms in Fabry disease: the importance of coping, subjective health perception and pain
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Marjana R. Lima, Marcel G. W. Dijkgraaf, Gert J. Geurtsen, Mirjam Langeveld, Ivo N. van Schaik, Carla E. M. Hollak, Maria Gabriela Figueiro Longo, Leonardo Modesti Vedolin, Simon Körver, Endocrinology, AGEM - Inborn errors of metabolism, Graduate School, Medical Psychology, AMS - Restoration & Development, ANS - Neurodegeneration, Epidemiology and Data Science, APH - Methodology, APH - Mental Health, and ACS - Diabetes & metabolism
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Adult ,Male ,Coping (psychology) ,Psychological intervention ,Pain ,lcsh:Medicine ,Health perception ,Social support ,Surveys and Questionnaires ,Medicine ,Humans ,Pharmacology (medical) ,Genetics (clinical) ,Depressive symptoms ,Aged ,Fabry disease ,business.industry ,Depression ,Research ,lcsh:R ,Brain ,General Medicine ,Center for Epidemiologic Studies Depression Scale ,Middle Aged ,medicine.disease ,Magnetic Resonance Imaging ,Cohort ,Female ,Coping ,business ,Clinical psychology - Abstract
Background Despite the high prevalence of depressive symptoms in Fabry disease (FD), it is unclear which patient characteristics are important in relation to these symptoms. Additionally, the impact of coping styles in relation to depressive symptoms in FD has been unexplored. Determining the impact of different factors relating to depressive symptoms in FD can guide both prevention and treatment of these symptoms. Methods Depressive symptoms (Center for Epidemiologic Studies Depression scale (CESD)) and coping styles (Utrecht Coping List) were assessed in a Dutch FD cohort. Other potentially important variables were identified from FD literature and assessed in this cohort. Relations were evaluated using multiple linear models. Results Potentially important variables in FD literature were: pain, unemployment, health perception, being single, comorbidities and stroke. Employed coping styles were “avoidance and brooding”, “positivity and problem solving” and “seeking social support”. Thirty-one of the 81 FD patients (38%) had depressive symptoms. CESD-scores were lower in patients with better health perception and more “positivity and problem solving” and higher in patients with more pain and “avoidance and brooding”. The best model explained 70% (95%CI: 54–76%) of observed variance of the CESD. Conclusions Depressive symptoms in FD are related to pain, negative health perception and use of specific coping styles. Psychological interventions could be employed to alter coping behavior and alleviate depressive symptoms.
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- 2020
10. Evaluation of Ultrafast Wave–Controlled Aliasing in Parallel Imaging 3D-FLAIR in the Visualization and Volumetric Estimation of Cerebral White Matter Lesions
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Stephen F. Cauley, Qiuyun Fan, Maria Gabriela Figueiro Longo, John Conklin, Chanon Ngamsombat, Wei-Ching Lo, Qiyuan Tian, R. Gilberto Gonzalez, A.L.M. Gonçalves Filho, Kawin Setsompop, Daniel Polak, Wei Liu, John E. Kirsch, Otto Rapalino, Susie Y. Huang, and Pamela W. Schaefer
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Intraclass correlation ,business.industry ,Cerebral white matter ,Adult Brain ,Brain ,Fluid-attenuated inversion recovery ,Magnetic Resonance Imaging ,White Matter ,Hyperintensity ,Visualization ,Lesion ,Motion ,Aliasing ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Neurology (clinical) ,medicine.symptom ,Parallel imaging ,Nuclear medicine ,business ,Artifacts - Abstract
BACKGROUND AND PURPOSE: Our aim was to evaluate an ultrafast 3D-FLAIR sequence using Wave–controlled aliasing in parallel imaging encoding (Wave-FLAIR) compared with standard 3D-FLAIR in the visualization and volumetric estimation of cerebral white matter lesions in a clinical setting. MATERIALS AND METHODS: Forty-two consecutive patients underwent 3T brain MR imaging, including standard 3D-FLAIR (acceleration factor = 2, scan time = 7 minutes 50 seconds) and resolution-matched ultrafast Wave-FLAIR sequences (acceleration factor = 6, scan time = 2 minutes 45 seconds for the 20-channel coil; acceleration factor = 9, scan time = 1 minute 50 seconds for the 32-channel coil) as part of clinical evaluation for demyelinating disease. Automated segmentation of cerebral white matter lesions was performed using the Lesion Segmentation Tool in SPM. Student t tests, intraclass correlation coefficients, relative lesion volume difference, and Dice similarity coefficients were used to compare volumetric measurements among sequences. Two blinded neuroradiologists evaluated the visualization of white matter lesions, artifacts, and overall diagnostic quality using a predefined 5-point scale. RESULTS: Standard and Wave-FLAIR sequences showed excellent agreement of lesion volumes with an intraclass correlation coefficient of 0.99 and mean Dice similarity coefficient of 0.97 (SD, 0.05) (range, 0.84–0.99). Wave-FLAIR was noninferior to standard FLAIR for visualization of lesions and motion. The diagnostic quality for Wave-FLAIR was slightly greater than for standard FLAIR for infratentorial lesions (P
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- 2021
11. Clinical validation of Wave-CAIPI susceptibility-weighted imaging for routine brain MRI at 1.5 T
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John Conklin, Maria Gabriela Figueiro Longo, Azadeh Tabari, Augusto Lio Goncalves Filho, Wei Liu, Daniel Nicolas Splitthoff, Wei-Ching Lo, Stephen F. Cauley, Kawin Setsompop, Pamela W. Schaefer, John E. Kirsch, Otto Rapalino, and Susie Y. Huang
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Imaging, Three-Dimensional ,Brain ,Humans ,Radiology, Nuclear Medicine and imaging ,Neuroimaging ,General Medicine ,Artifacts ,Magnetic Resonance Imaging - Abstract
Wave-CAIPI (Controlled Aliasing in Parallel Imaging) enables dramatic reduction in acquisition time of 3D MRI sequences such as 3D susceptibility-weighted imaging (SWI) but has not been clinically evaluated at 1.5 T. We sought to compare highly accelerated Wave-CAIPI SWI (Wave-SWI) with two alternative standard sequences, conventional three-dimensional SWI and two-dimensional T2*-weighted Gradient-Echo (T2*w-GRE), in patients undergoing routine brain MRI at 1.5 T.In this study, 172 patients undergoing 1.5 T brain MRI were scanned with a more commonly used susceptibility sequence (standard SWI or T2*w-GRE) and a highly accelerated Wave-SWI sequence. Two radiologists blinded to the acquisition technique scored each sequence for visualization of pathology, motion and signal dropout artifacts, image noise, visualization of normal anatomy (vessels and basal ganglia mineralization), and overall diagnostic quality. Superiority testing was performed to compare Wave-SWI to T2*w-GRE, and non-inferiority testing with 15% margin was performed to compare Wave-SWI to standard SWI.Wave-SWI performed superior in terms of visualization of pathology, signal dropout artifacts, visualization of normal anatomy, and overall image quality when compared to T2*w-GRE (all p0.001). Wave-SWI was non-inferior to standard SWI for visualization of normal anatomy and pathology, signal dropout artifacts, and overall image quality (all p0.001). Wave-SWI was superior to standard SWI for motion artifact (p0.001), while both conventional susceptibility sequences were superior to Wave-SWI for image noise (p0.001).Wave-SWI can be performed in a 1.5 T clinical setting with robust performance and preservation of diagnostic quality.• Wave-SWI accelerated the acquisition of 3D high-resolution susceptibility images in 70% of the acquisition time of the conventional T2*GRE. • Wave-SWI performed superior to T2*w-GRE for visualization of pathology, signal dropout artifacts, and overall diagnostic image quality. • Wave-SWI was noninferior to standard SWI for visualization of normal anatomy and pathology, signal dropout artifacts, and overall diagnostic image quality.
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- 2021
12. Highly-accelerated volumetric brain examination using optimized wave-CAIPI encoding
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Berkin Bilgic, Daniel Polak, Maria Gabriela Figueiro Longo, Stephen F. Cauley, Esther Raithel, Kawin Setsompop, John Conklin, Peter Bachert, Ned A. Ohringer, Susie Y. Huang, and Lawrence L. Wald
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Scanner ,education.field_of_study ,Image quality ,business.industry ,Population ,Fluid-attenuated inversion recovery ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,Noise ,0302 clinical medicine ,Sampling (signal processing) ,Encoding (memory) ,Radiology, Nuclear Medicine and imaging ,Nuclear medicine ,business ,education ,Brain examination ,Mathematics - Abstract
BACKGROUND Rapid volumetric imaging protocols could better utilize limited scanner resources. PURPOSE To develop and validate an optimized 6-minute high-resolution volumetric brain MRI examination using Wave-CAIPI encoding. STUDY TYPE Prospective. POPULATION/SUBJECTS Ten healthy subjects and 20 patients with a variety of intracranial pathologies. FIELD STRENGTH/SEQUENCE At 3 T, MPRAGE, T2 -weighted SPACE, SPACE FLAIR, and SWI were acquired at 9-fold acceleration using Wave-CAIPI and for comparison at 2-4-fold acceleration using conventional GRAPPA. ASSESSMENT Extensive simulations were performed to optimize the Wave-CAIPI protocol and minimize both g-factor noise amplification and potential T1 /T2 blurring artifacts. Moreover, refinements in the autocalibrated reconstruction of Wave-CAIPI were developed to ensure high-quality reconstructions in the presence of gradient imperfections. In a randomized and blinded fashion, three neuroradiologists assessed the diagnostic quality of the optimized 6-minute Wave-CAIPI exam and compared it to the roughly 3× slower GRAPPA accelerated protocol using both an individual and head-to-head analysis. STATISTICAL TEST A noninferiority test was used to test whether the diagnostic quality of Wave-CAIPI was noninferior to the GRAPPA acquisition, with a 15% noninferiority margin. RESULTS Among all sequences, Wave-CAIPI achieved negligible g-factor noise amplification (gavg ≤ 1.04) and burring artifacts from T1 /T2 relaxation. Improvements of our autocalibration approach for gradient imperfections enabled increased robustness to gradient mixing imperfections in tilted-field of view (FOV) prescriptions as well as variations in gradient and analog-to-digital converter (ADC) sampling rates. In the clinical evaluation, Wave-CAIPI achieved similar mean scores when compared with GRAPPA (MPRAGE: OW = 4.03, OG = 3.97; T2 w SPACE: OW = 4.00, OG = 4.00; SPACE FLAIR: OW = 3.97, OG = 3.97; SWI: OW = 3.93, OG = 3.83) and was statistically noninferior (N = 30, P
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- 2019
13. Predictors of objective cognitive impairment and subjective cognitive complaints in patients with Fabry disease
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Ivo N. van Schaik, Gert J. Geurtsen, Maria Gabriela Figueiro Longo, Marcel G. W. Dijkgraaf, Marjana R. Lima, Leonardo Modesti Vedolin, Mirjam Langeveld, Simon Körver, Carla E. M. Hollak, Medical Psychology, AMS - Restoration & Development, Amsterdam Neuroscience - Neurodegeneration, Endocrinology, AGEM - Inborn errors of metabolism, Epidemiology and Data Science, APH - Methodology, APH - Mental Health, and ACS - Diabetes & metabolism
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0301 basic medicine ,Adult ,Male ,lcsh:Medicine ,Neuropsychological Tests ,Article ,03 medical and health sciences ,0302 clinical medicine ,Sex Factors ,Interview, Psychological ,History of depression ,medicine ,Humans ,Cognitive Dysfunction ,Neuropsychological assessment ,Cognitive skill ,lcsh:Science ,Stroke ,Depressive Disorder ,Multidisciplinary ,medicine.diagnostic_test ,business.industry ,lcsh:R ,Cognition ,Neuropsychological test ,Middle Aged ,medicine.disease ,Fabry disease ,030104 developmental biology ,Structured interview ,Fabry Disease ,Female ,lcsh:Q ,business ,Cognition Disorders ,030217 neurology & neurosurgery ,Clinical psychology - Abstract
This study investigates the relationship between objective cognitive impairment (OCI), subjective cognitive complaints and depressive symptoms in men and women with classical and non-classical Fabry disease (FD). Cognitive functioning was assessed using a neuropsychological test battery, subjective cognitive complaints using a structured interview and depressive symptoms using a depression scale (CESD). Eighty-one patients were included (mean age 44.5 ± 14.3, 35% men, 74% classical). Subjective cognitive complaints were reported by 64% of all patients. OCI was present in thirteen patients (16%), predominantly in men with classical FD. Thirty-one patients (38%) had a high score (≥16) on the CESD scale. Male sex (OR, 6.8; 95%CI, 1.6–39.8; p = 1.6 * 10−2) and stroke (OR, 6.4; 95% CI, 1.1–41.0; p = 3.7 * 10−2) were independently positively associated with OCI, and premorbid IQ (one IQ point increase: OR, 0.91; 95%CI, 0.82–0.98; p = 3.8 * 10−2) was independently negatively associated with OCI. The CESD-score (one point increase: OR, 1.07; 95% CI, 1.02–1.13; p = 3.3 * 10−3) and a history of depression (OR, 2.7; 95% CI, 1.1–7.3; p = 3.9 * 10−2) were independently positively associated with subjective cognitive complaints. OCI is present in 16% of FD patients, warranting referral for neuropsychological assessment. Nevertheless, subjective cognitive complaints are related to depressive symptoms, emphasizing the importance of recognition and treatment of the latter.
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- 2019
14. Evaluation of highly accelerated wave controlled aliasing in parallel imaging (Wave-CAIPI) susceptibility-weighted imaging in the non-sedated pediatric setting: a pilot study
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John Conklin, Azadeh Tabari, Maria Gabriela Figueiro Longo, Camilo Jaimes Cobos, Kawin Setsompop, Stephen F. Cauley, John E. Kirsch, Susie Yi Huang, Otto Rapalino, Michael S. Gee, and Paul J. Caruso
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Male ,Imaging, Three-Dimensional ,Pediatrics, Perinatology and Child Health ,Brain ,Humans ,Radiology, Nuclear Medicine and imaging ,Female ,Neuroimaging ,Pilot Projects ,Artifacts ,Child ,Magnetic Resonance Imaging - Abstract
Susceptibility-weighted imaging (SWI) is highly sensitive for intracranial hemorrhagic and mineralized lesions but is associated with long scan times. Wave controlled aliasing in parallel imaging (Wave-CAIPI) enables greater acceleration factors and might facilitate broader application of SWI, especially in motion-prone populations.To compare highly accelerated Wave-CAIPI SWI to standard SWI in the non-sedated pediatric outpatient setting, with respect to the following variables: estimated scan time, image noise, artifacts, visualization of normal anatomy and visualization of pathology.Twenty-eight children (11 girls, 17 boys; mean age ± standard deviation [SD] = 128.3±62 months) underwent 3-tesla (T) brain MRI, including standard three-dimensional (3-D) SWI sequence followed by a highly accelerated Wave-CAIPI SWI sequence for each subject. We rated all studies using a predefined 5-point scale and used the Wilcoxon signed rank test to assess the difference for each variable between sequences.Wave-CAIPI SWI provided a 78% and 67% reduction in estimated scan time using the 32- and 20-channel coils, respectively, corresponding to estimated scan time reductions of 3.5 min and 3 min, respectively. All 28 children were imaged without anesthesia. Inter-reader agreement ranged from fair to substantial (k=0.67 for evaluation of pathology, 0.55 for anatomical contrast, 0.3 for central noise, and 0.71 for artifacts). Image noise was rated higher in the central brain with wave SWI (P0.01), but not in the peripheral brain. There was no significant difference in the visualization of normal anatomical structures and visualization of pathology between the standard and wave SWI sequences (P=0.77 and P=0.79, respectively).Highly accelerated Wave-CAIPI SWI of the brain can provide similar image quality to standard SWI, with estimated scan time reduction of 3-3.5 min depending on the radiofrequency coil used, with fewer motion artifacts, at a cost of mild but perceptibly increased noise in the central brain.
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- 2021
15. Comparison of ultrafast wave-controlled aliasing in parallel imaging (CAIPI) magnetization-prepared rapid acquisition gradient echo (MP-RAGE) and standard MP-RAGE in non-sedated children: initial clinical experience
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Azadeh, Tabari, John, Conklin, Maria Gabriela, Figueiro Longo, Camilo, Jaimes, Kawin, Setsompop, Stephen F, Cauley, John E, Kirsch, Susie Yi, Huang, Otto, Rapalino, Michael S, Gee, and Paul J, Caruso
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Male ,Imaging, Three-Dimensional ,Adolescent ,Brain ,Humans ,Artifacts ,Child ,Magnetic Resonance Imaging - Abstract
Fast magnetic resonance imaging (MRI) sequences are advantageous in pediatric imaging as they can lessen child discomfort, decrease motion artifact and improve scanner availability.To evaluate the feasibility of an ultrafast wave-CAIPI (controlled aliasing in parallel imaging) MP-RAGE (magnetization-prepared rapid gradient echo) sequence for brain imaging of awake pediatric patients.Each MRI included a standard MP-RAGE sequence and an ultrafast wave-MP-RAGE sequence. Two neuroradiologists evaluated both sequences in terms of artifacts, noise, anatomical contrast and pathological contrast. A predefined 5-point scale was used by two independent pediatric neuroradiologists. A Wilcoxon signed-rank test was used to evaluate the difference between sequences for each variable.Twenty-four patients (14 males; mean age: 11.5±4.5 years, range: 1 month to 17.8 years) were included. Wave-CAIPI MP-RAGE provided a 77% reduction in scan time using a 32-channel coil and a 70% reduction using a 20-channel coil. Visualization of the pathology, artifacts and pathological enhancement (including parenchymal, leptomeningeal and dural enhancement) was not significantly different between standard MP-RAGE and wave-CAIPI MP-RAGE (all P0.05). For central (P0.001) and peripheral (P0.001) noise, and the evaluation of the anatomical structures (P0.001), the observers favored standard MP-RAGE over wave-CAIPI MP-RAGE.Ultrafast brain imaging with wave-CAIPI MP-RAGE is feasible in awake pediatric patients, providing a substantial reduction in scan time at a cost of subjectively increased image noise.
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- 2020
16. Effect of Transcranial Low-Level Light Therapy Among Patients With Moderate Traumatic Brain Injury
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Isabel Chico-Calero, Emad Ahmadi, Benjamin J. Vakoc, Michael H. Lev, Anastasia Yendiki, Jonathan Welt, Blair A. Perry, Suk-Tak Chan, Can Ozan Tan, Jarone Lee, Michael R. Hamblin, Rajiv Gupta, Nathaniel D. Mercaldo, Jacqueline Namati, Maria Gabriela Figueiro Longo, and Eva M. Ratai
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Low-Level Light Therapy ,business.industry ,Traumatic brain injury ,Anesthesia ,Medicine ,business ,medicine.disease ,Biological Psychiatry - Published
- 2021
17. Effect of Transcranial Low-Level Light Therapy vs Sham Therapy Among Patients With Moderate Traumatic Brain Injury
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Terry Rauch, Ramon Diaz-Arrastia, Maria Gabriela Figueiro Longo, Benjamin J. Vakoc, Isabel Chico-Calero, Jacqueline Namati, Eva M. Ratai, Michael H. Lev, Jonathan Welt, Blair A. Parry, Arman Avesta, Rox Anderson, Anastasia Yendiki, Michael R. Hamblin, Lynn A. Drake, Jarone Lee, Suk-Tak Chan, Nathaniel D. Mercaldo, Can Ozan Tan, and Rajiv Gupta
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Light therapy ,Adult ,Male ,Traumatic brain injury ,medicine.medical_treatment ,Population ,Ultraviolet therapy ,Severity of Illness Index ,law.invention ,Placebos ,Randomized controlled trial ,Double-Blind Method ,law ,Surveys and Questionnaires ,Severity of illness ,Brain Injuries, Traumatic ,Neural Pathways ,medicine ,Humans ,Low-Level Light Therapy ,education ,Aged ,Original Investigation ,education.field_of_study ,medicine.diagnostic_test ,business.industry ,Post-Concussion Syndrome ,Research ,Magnetic resonance imaging ,General Medicine ,Rivermead post-concussion symptoms questionnaire ,Middle Aged ,medicine.disease ,Magnetic Resonance Imaging ,White Matter ,Online Only ,Diffusion Tensor Imaging ,Treatment Outcome ,Neurology ,Anesthesia ,Anisotropy ,Feasibility Studies ,Female ,business - Abstract
Key Points Question Is near-infrared low-level light therapy (LLLT) feasible and safe after moderate traumatic brain injury, and does LLLT affect the brain and exhibit neuroreactivity? Findings In this randomized clinical trial including 68 patients with moderate traumatic brain injury who were randomized to receive LLLT or sham therapy, 28 patients completed at least 1 LLLT session without any reported adverse events. In the late subacute stage, there were statistically significant differences in the magnetic resonance imaging–derived diffusion parameters of the white matter tracts between the sham- and light-treated groups, demonstrating neuroreactivity of LLLT. Meaning The results of this clinical trial show that transcranial LLLT is feasible, safe, and affects the brain in a measurable manner., Importance Preclinical studies have shown that transcranial near-infrared low-level light therapy (LLLT) administered after traumatic brain injury (TBI) confers a neuroprotective response. Objectives To assess the feasibility and safety of LLLT administered acutely after a moderate TBI and the neuroreactivity to LLLT through quantitative magnetic resonance imaging metrics and neurocognitive assessment. Design, Setting, and Participants A randomized, single-center, prospective, double-blind, placebo-controlled parallel-group trial was conducted from November 27, 2015, through July 11, 2019. Participants included 68 men and women with acute, nonpenetrating, moderate TBI who were randomized to LLLT or sham treatment. Analysis of the response-evaluable population was conducted. Interventions Transcranial LLLT was administered using a custom-built helmet starting within 72 hours after the trauma. Magnetic resonance imaging was performed in the acute (within 72 hours), early subacute (2-3 weeks), and late subacute (approximately 3 months) stages of recovery. Clinical assessments were performed concomitantly and at 6 months via the Rivermead Post-Concussion Questionnaire (RPQ), a 16-item questionnaire with each item assessed on a 5-point scale ranging from 0 (no problem) to 4 (severe problem). Main Outcomes and Measures The number of participants to successfully and safely complete LLLT without any adverse events within the first 7 days after the therapy was the primary outcome measure. Secondary outcomes were the differential effect of LLLT on MR brain diffusion parameters and RPQ scores compared with the sham group. Results Of the 68 patients who were randomized (33 to LLLT and 35 to sham therapy), 28 completed at least 1 LLLT session. No adverse events referable to LLLT were reported. Forty-three patients (22 men [51.2%]; mean [SD] age, 50.49 [17.44] years]) completed the study with at least 1 magnetic resonance imaging scan: 19 individuals in the LLLT group and 24 in the sham treatment group. Radial diffusivity (RD), mean diffusivity (MD), and fractional anisotropy (FA) showed significant time and treatment interaction at 3-month time point (RD: 0.013; 95% CI, 0.006 to 0.019; P, This randomized clinical trial evaluates the effect of near-infrared low-level light therapy in patients with traumatic brain injury from the time of injury until 3 months after the injury.
- Published
- 2020
18. Cognitive functioning and depressive symptoms in Fabry disease: A follow-up study
- Author
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Marcel G. W. Dijkgraaf, Gert J. Geurtsen, Mirjam Langeveld, Carla E. M. Hollak, Maria Gabriela Figueiro Longo, Ivo N. van Schaik, Marjana R. Lima, Simon Körver, AGEM - Amsterdam Gastroenterology Endocrinology Metabolism, Endocrinology, Graduate School, Medical Psychology, ANS - Neurodegeneration, AMS - Amsterdam Movement Sciences, Neurology, Epidemiology and Data Science, APH - Methodology, ACS - Diabetes & metabolism, and APH - Mental Health
- Subjects
Adult ,Male ,Coping (psychology) ,medicine.medical_specialty ,Pain ,Neuropsychological Tests ,cognitive functioning ,03 medical and health sciences ,Young Adult ,depressive symptoms ,depressive disorder ,Epidemiology ,Adaptation, Psychological ,follow-up ,Genetics ,Medicine ,Humans ,Cognitive Dysfunction ,Cognitive skill ,Prospective Studies ,Prospective cohort study ,Genetics (clinical) ,Depressive symptoms ,030304 developmental biology ,Aged ,follow‐up ,0303 health sciences ,Fabry disease ,medicine.diagnostic_test ,business.industry ,Depression ,030305 genetics & heredity ,Follow up studies ,Brain ,Neuropsychological test ,Original Articles ,Middle Aged ,medicine.disease ,Magnetic Resonance Imaging ,Stroke ,coping ,Linear Models ,Quality of Life ,Female ,Original Article ,business ,Clinical psychology ,Follow-Up Studies - Abstract
Patients with Fabry disease (FD) have a high prevalence of depressive symptoms and can suffer from cognitive impairment, negatively affecting their life. The course of cognitive functioning and depressive symptoms in FD is unknown. The aim of this prospective cohort study was to describe changes in cognitive functioning and depressive symptoms and to identify related variables in patients with FD over 1 year. Assessments were conducted twice, using a neuropsychological test battery and the Centre of Epidemiological Studies Depression scale (CESD). Eighty‐one patients were included of which 76 patients (94%) completed both assessments (age: 44 years, 34% men, 75% classical phenotype). A significant decrease in cognitive functioning was found in four patients (5%), with patients regressing from excellent to average/good. Changes were not related to sex, phenotype, stroke, IQ or CESD scores. CESD scores ≥16 were present in 29 patients (38%) at baseline. Using the reliable change index a decrease in CESD scores was found in six patients (8%). Decreased CESD scores were independently related to employing a positive and problem solving coping style and increased CESD scores to an avoiding and brooding coping style and worsening health perception. We found no major changes in cognitive functioning in patients with FD during 1 year follow‐up making it an unsuitable outcome in FD treatment trials. Considering the high prevalence of persistent depressive symptoms, assessment of depressive symptoms should be part of routine follow‐up. Altering coping styles and health perception may improve psychological well‐being in FD.
- Published
- 2020
19. Evaluation of Ultrafast Wave-CAIPI MPRAGE for Visual Grading and Automated Measurement of Brain Tissue Volume
- Author
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Pamela W. Schaefer, Otto Rapalino, Maria Gabriela Figueiro Longo, Kawin Setsompop, Maya N. Polackal, Daniel Polak, Qiyuan Tian, John E. Kirsch, Stephen F. Cauley, John Conklin, Daniel N. Splitthoff, R. G. Gonzalez, Susie Y. Huang, and Wei Liu
- Subjects
Adult ,Male ,Adolescent ,Neuroimaging ,Brain tissue ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,Visual grading ,Young Adult ,0302 clinical medicine ,Sørensen–Dice coefficient ,Image Interpretation, Computer-Assisted ,Medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,In patient ,Aged ,Aged, 80 and over ,business.industry ,Adult Brain ,Brain ,Reproducibility of Results ,Neurodegenerative Diseases ,Middle Aged ,Mr imaging ,Magnetic Resonance Imaging ,Healthy Volunteers ,Brain size ,Acquisition time ,Female ,Neurology (clinical) ,business ,Nuclear medicine ,030217 neurology & neurosurgery ,Volume (compression) - Abstract
BACKGROUND AND PURPOSE: Volumetric brain MR imaging typically has long acquisition times. We sought to evaluate an ultrafast MPRAGE sequence based on Wave-CAIPI (Wave-MPRAGE) compared with standard MPRAGE for evaluation of regional brain tissue volumes. MATERIALS AND METHODS: We performed scan-rescan experiments in 10 healthy volunteers to evaluate the intraindividual variability of the brain volumes measured using the standard and Wave-MPRAGE sequences. We then evaluated 43 consecutive patients undergoing brain MR imaging. Patients underwent 3T brain MR imaging, including a standard MPRAGE sequence (acceleration factor [R] = 2, acquisition time [TA] = 5.2 minutes) and an ultrafast Wave-MPRAGE sequence (R = 9, TA = 1.15 minutes for the 32-channel coil; R = 6, TA = 1.75 minutes for the 20-channel coil). Automated segmentation of regional brain volume was performed. Two radiologists evaluated regional brain atrophy using semiquantitative visual rating scales. RESULTS: The mean absolute symmetrized percent change in the healthy volunteers participating in the scan-rescan experiments was not statistically different in any brain region for both the standard and Wave-MPRAGE sequences. In the patients undergoing evaluation for neurodegenerative disease, the Dice coefficient of similarity between volumetric measurements obtained from standard and Wave-MPRAGE ranged from 0.86 to 0.95. Similarly, for all regions, the absolute symmetrized percent change for brain volume and cortical thickness showed
- Published
- 2020
20. Validation of Highly Accelerated Wave–CAIPI SWI Compared with Conventional SWI and T2*-Weighted Gradient Recalled-Echo for Routine Clinical Brain MRI at 3T
- Author
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John E. Kirsch, Stephen F. Cauley, Kawin Setsompop, Pamela W. Schaefer, Maria Gabriela Figueiro Longo, John Conklin, R. G. Gonzalez, Susie Y. Huang, and Otto Rapalino
- Subjects
Adult ,Male ,cells ,genetic processes ,Neuroimaging ,macromolecular substances ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Motion artifacts ,Standard sequence ,Gradient recalled echo ,Brain mri ,Humans ,Medicine ,Radiology, Nuclear Medicine and imaging ,Aged ,Adult patients ,business.industry ,Adult Brain ,Brain ,Middle Aged ,Magnetic Resonance Imaging ,enzymes and coenzymes (carbohydrates) ,Diagnostic quality ,Female ,Neurology (clinical) ,biological phenomena, cell phenomena, and immunity ,Artifacts ,T2 weighted ,business ,Nuclear medicine ,Intracranial Hemorrhages ,030217 neurology & neurosurgery - Abstract
BACKGROUND AND PURPOSE: SWI is valuable for characterization of intracranial hemorrhage and mineralization but has long acquisition times. We compared a highly accelerated wave–controlled aliasing in parallel imaging (CAIPI) SWI sequence with 2 commonly used alternatives, standard SWI and T2*-weighted gradient recalled-echo (T2*W GRE), for routine clinical brain imaging at 3T. MATERIALS AND METHODS: A total of 246 consecutive adult patients were prospectively evaluated using a conventional SWI or T2*W GRE sequence and an optimized wave–CAIPI SWI sequence, which was 3–5 times faster than the standard sequence. Two blinded radiologists scored each sequence for the presence of hemorrhage, the number of microhemorrhages, and severity of motion artifacts. Wave–CAIPI SWI was then evaluated in head-to-head comparison with the conventional sequences for visualization of pathology, artifacts, and overall diagnostic quality. Forced-choice comparisons were used for all scores. Wave–CAIPI SWI was tested for superiority relative to T2*W GRE and for noninferiority relative to standard SWI using a 15% noninferiority margin. RESULTS: Compared with T2*W GRE, wave–CAIPI SWI detected hemorrhages in more cases (P
- Published
- 2019
21. Correlation of CSF flow using phase-contrast MRI with ventriculomegaly and CSF opening pressure in mucopolysaccharidoses
- Author
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Maria Gabriela Figueiro Longo, Maurício Anés, Amauri Dalla Corte, Mônica Moraes Ferreira, Carolina Fischinger Moura de Souza, Leonardo Modesti Vedolin, Roberto Giugliani, Solanger Graciana Paulão Perrone, Armelle Lokossou, Olivier Balédent, and Fábio Kunihiro Maeda
- Subjects
Adult ,Male ,Pathology ,medicine.medical_specialty ,Adolescent ,Neuroimaging ,Fluid-attenuated inversion recovery ,lcsh:RC346-429 ,030218 nuclear medicine & medical imaging ,Young Adult ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,0302 clinical medicine ,Cerebrospinal fluid ,Developmental Neuroscience ,Cerebrospinal Fluid Pressure ,medicine ,Humans ,Cognitive decline ,Child ,Stroke ,lcsh:Neurology. Diseases of the nervous system ,Third ventricle ,business.industry ,Infant ,Correction ,General Medicine ,Stroke volume ,Mucopolysaccharidoses ,medicine.disease ,Magnetic Resonance Imaging ,Hydrocephalus ,Cross-Sectional Studies ,medicine.anatomical_structure ,Neurology ,Brain MRI ,Child, Preschool ,Ventricular enlargement ,Female ,business ,030217 neurology & neurosurgery ,Ventriculomegaly - Abstract
Background Very little is known about the incidence and prevalence of hydrocephalus in patients with mucopolysaccharidoses (MPS). The biggest challenge is to distinguish communicating hydrocephalus from ventricular dilatation secondary to brain atrophy, because both conditions share common clinical and neuroradiological features. The main purpose of this study is to assess the relationship between ventriculomegaly, brain and cerebrospinal fluid (CSF) volumes, aqueductal and cervical CSF flows, and CSF opening pressure in MPS patients, and to provide potential biomarkers for abnormal CSF circulation. Methods Forty-three MPS patients (12 MPS I, 15 MPS II, 5 MPS III, 9 MPS IV A and 2 MPS VI) performed clinical and developmental tests, and T1, T2, FLAIR and phase-contrast magnetic resonance imaging (MRI) followed by a lumbar puncture with the CSF opening pressure assessment. For the analysis of MRI variables, we measured the brain and CSF volumes, white matter (WM) lesion load, Evans’ index, third ventricle width, callosal angle, dilated perivascular spaces (PVS), craniocervical junction stenosis, aqueductal and cervical CSF stroke volumes, and CSF glycosaminoglycans concentration. Results All the scores used to assess the supratentorial ventricles enlargement and the ventricular CSF volume presented a moderate correlation with the aqueductal CSF stroke volume (ACSV). The CSF opening pressure did not correlate either with the three measures of ventriculomegaly, or the ventricular CSF volume, or with the ACSV. Dilated PVS showed a significant association with the ventriculomegaly, ventricular CSF volume and elevated ACSV. Conclusions In MPS patients ventriculomegaly is associated with a severe phenotype, increased cognitive decline, WM lesion severity and enlarged PVS. The authors have shown that there are associations between CSF flow measurements and measurements related to CSF volumetrics. There was also an association of volumetric measurements with the degree of dilated PVS.
- Published
- 2017
22. Diagnostic Performance of a 10-Minute Gadolinium-Enhanced Brain MRI Protocol Compared with the Standard Clinical Protocol for Detection of Intracranial Enhancing Lesions
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Bruce R. Rosen, Pamela W. Schaefer, Thomas Witzel, Keith Heberlein, Otto Rapalino, J. Fagundes, Maria Gabriela Figueiro Longo, R. G. Gonzalez, and Susie Y. Huang
- Subjects
Adult ,Male ,Image quality ,Movement ,Gadolinium ,Population ,Contrast Media ,chemistry.chemical_element ,Neuroimaging ,Image processing ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Precontrast ,Clinical Protocols ,Image Processing, Computer-Assisted ,Brain mri ,Humans ,Medicine ,Radiology, Nuclear Medicine and imaging ,Prospective Studies ,education ,Aged ,Protocol (science) ,Brain Diseases ,education.field_of_study ,business.industry ,Adult Brain ,Brain ,Reproducibility of Results ,Middle Aged ,Magnetic Resonance Imaging ,chemistry ,Calibration ,Female ,Neurology (clinical) ,Artifacts ,Nuclear medicine ,business ,030217 neurology & neurosurgery - Abstract
BACKGROUND AND PURPOSE: The development of new MR imaging scanners with stronger gradients and improvement in coil technology, allied with emerging fast imaging techniques, has allowed a substantial reduction in MR imaging scan times. Our goal was to develop a 10-minute gadolinium-enhanced brain MR imaging protocol with accelerated sequences and to evaluate its diagnostic performance compared with the standard clinical protocol. MATERIALS AND METHODS: Fifty-three patients referred for brain MR imaging with contrast were scanned with a 3T scanner. Each MR image consisted of 5 basic fast precontrast sequences plus standard and accelerated versions of the same postcontrast T1WI sequences. Two neuroradiologists assessed the image quality and the final diagnosis for each set of postcontrast sequences and compared their performances. RESULTS: The acquisition time of the combined accelerated pre- and postcontrast sequences was 10 minutes and 15 seconds; and of the fast postcontrast sequences, 3 minutes and 36 seconds, 46% of the standard sequences. The 10-minute postcontrast axial T1WI had fewer image artifacts (P < .001) and better overall diagnostic quality (P < .001). Although the 10-minute MPRAGE sequence showed a tendency to have more artifacts than the standard sequence (P = .08), the overall diagnostic quality was similar (P = .66). Moreover, there was no statistically significant difference in the diagnostic performance between the protocols. The sensitivity, specificity, and accuracy values for the 10-minute protocol were 100.0%, 88.9%, and 98.1%. CONCLUSIONS: The 10-minute brain MR imaging protocol with contrast is comparable in diagnostic performance with the standard protocol in an inpatient motion-prone population, with the additional benefits of reducing acquisition times and image artifacts.
- Published
- 2017
23. Simultaneous Multislice-Based 5-Minute Lumbar Spine MRI Protocol: Initial Experience in a Clinical Setting
- Author
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Maria Gabriela Figueiro Longo, Ramon G. Gonzalez, Thomas Witzel, Joana Fagundes, Himanshu Bhat, Susie Y. Huang, Keith Heberlein, Otto Rapalino, Pamela W. Schaefer, William A. Mehan, Bruce R. Rosen, and Daniel I. Rosenthal
- Subjects
Protocol (science) ,medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,Image quality ,Lumbar spine MRI ,Simultaneous multislice ,Magnetic resonance imaging ,Sagittal plane ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,medicine.anatomical_structure ,medicine ,Standard protocol ,Radiology, Nuclear Medicine and imaging ,Neurology (clinical) ,Radiology ,Parallel imaging ,Nuclear medicine ,business ,030217 neurology & neurosurgery - Abstract
BACKGROUND AND PURPOSE Previous studies have used parallel imaging (PI) techniques to decrease spine magnetic resonance imaging (MRI) protocol acquisition times. Recently developed MRI sequences allow even faster acquisitions. Our purpose was to develop a lumbar spine MRI protocol using PI with GRAPPA (generalized autocalibrating partially parallel acquisition) and a simultaneous multislice (SMS)–based sequence and to evaluate its diagnostic performance compared to a standard lumbar spine MRI protocol. METHODS Ten patients were scanned in a 3-Tesla scanner (MAGNETOM Skyra, Siemens Healthcare). Each patient was imaged using a standard protocol and an optimized fast protocol acquiring the same contrasts and planes. The fast protocol included sagittal T1, T2, and fat suppressed T2 sequences accelerated with GRAPPA and an SMS-based axial T2-weighted sequence using a high-density spine coil (Siemens MR, 30 channel spine). Two blinded neuroradiologists independently assessed image quality and diagnostic accuracy for clinically relevant imaging findings. RESULTS The fast protocol acquisition time was 5:28 minutes, compared with 16:30 minutes for the standard protocol. Both protocols had a similar performance for definition of anatomical structures, diagnostic quality, and identification of clinically relevant imaging findings. There were more artifacts in the SMS Turbo Spin Echo (P = .014) sequence without compromising diagnostic performance. Artifacts in the remaining non-SMS sequences were similar in both protocols (P > .180). The sensitivity, specificity, and accuracy of the 5-minute protocol were 92.3%, 100.0%, and 99.6%, respectively, for the clinically relevant findings (P = 1.0, interrater agreement .57). CONCLUSIONS A 5-minute SMS-based MRI protocol for lumbar spine imaging is feasible and can be achieved without significant impact in the overall diagnostic quality.
- Published
- 2017
24. Advanced neuroimaging methods for assessment of low-level light therapy
- Author
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Eva-Maria Ratai, Suk-Tak Chan, Maria Gabriela Figueiro Longo, and Rajiv Gupta
- Subjects
Light therapy ,Traumatic brain injury ,business.industry ,medicine.medical_treatment ,Disease ,medicine.disease ,Low-Level Light Therapy ,Neuroimaging ,Effect light ,medicine ,Dementia ,business ,Stroke ,Neuroscience - Abstract
Light modulates multiple neurophysiologic pathways within brain. The effect of light therapy on these pathways may be assessed using a variety of techniques including symptom inventories, neurocognitive testing, and neuroimaging. This chapter describes various neuroimaging techniques that may be employed in studying the effect light has on brain in a variety of conditions and diseases such as traumatic brain injury, dementia syndromes, stroke, Parkinson disease, and others. While the chapter focuses on traumatic brain injury, the described neuroimaging methods are general and may be applied to any neurological condition.
- Published
- 2019
25. Correction to: Correlation of CSF flow using phase-contrast MRI with ventriculomegaly and CSF opening pressure in mucopolysaccharidoses
- Author
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Fábio Kunihiro Maeda, Maurício Anés, Olivier Balédent, Armelle Lokossou, Solanger Graciana Paulão Perrone, Roberto Giugliani, Amauri Dalla Corte, Leonardo Modesti Vedolin, Maria Gabriela Figueiro Longo, Carolina Fischinger Moura de Souza, and Mônica Moraes Ferreira
- Subjects
0301 basic medicine ,Pathology ,medicine.medical_specialty ,Phase contrast microscopy ,lcsh:RC346-429 ,law.invention ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,0302 clinical medicine ,Developmental Neuroscience ,law ,medicine ,lcsh:Neurology. Diseases of the nervous system ,Research ,General Medicine ,Mucopolysaccharidoses ,medicine.disease ,Csf flow ,030104 developmental biology ,Cerebrospinal fluid ,Neurology ,Brain MRI ,Ventricular enlargement ,Radiology ,Psychology ,030217 neurology & neurosurgery ,Ventriculomegaly ,Hydrocephalus - Abstract
Background Very little is known about the incidence and prevalence of hydrocephalus in patients with mucopolysaccharidoses (MPS). The biggest challenge is to distinguish communicating hydrocephalus from ventricular dilatation secondary to brain atrophy, because both conditions share common clinical and neuroradiological features. The main purpose of this study is to assess the relationship between ventriculomegaly, brain and cerebrospinal fluid (CSF) volumes, aqueductal and cervical CSF flows, and CSF opening pressure in MPS patients, and to provide potential biomarkers for abnormal CSF circulation. Methods Forty-three MPS patients (12 MPS I, 15 MPS II, 5 MPS III, 9 MPS IV A and 2 MPS VI) performed clinical and developmental tests, and T1, T2, FLAIR and phase-contrast magnetic resonance imaging (MRI) followed by a lumbar puncture with the CSF opening pressure assessment. For the analysis of MRI variables, we measured the brain and CSF volumes, white matter (WM) lesion load, Evans’ index, third ventricle width, callosal angle, dilated perivascular spaces (PVS), craniocervical junction stenosis, aqueductal and cervical CSF stroke volumes, and CSF glycosaminoglycans concentration. Results All the scores used to assess the supratentorial ventricles enlargement and the ventricular CSF volume presented a moderate correlation with the aqueductal CSF stroke volume (ACSV). The CSF opening pressure did not correlate either with the three measures of ventriculomegaly, or the ventricular CSF volume, or with the ACSV. Dilated PVS showed a significant association with the ventriculomegaly, ventricular CSF volume and elevated ACSV. Conclusions In MPS patients ventriculomegaly is associated with a severe phenotype, increased cognitive decline, WM lesion severity and enlarged PVS. The authors have shown that there are associations between CSF flow measurements and measurements related to CSF volumetrics. There was also an association of volumetric measurements with the degree of dilated PVS.
- Published
- 2017
26. MarkIt: A Collaborative Artificial Intelligence Annotation Platform Leveraging Blockchain For Medical Imaging Research
- Author
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John Conklin, Maria Gabriela Figueiro Longo, Jongmum Choi, Do-Yun Kim, Marc D. Succi, Synho Do, Joowon Chung, Soomin Jeon, and Jan Witowski
- Subjects
Process (engineering) ,business.industry ,Computer science ,Image processing ,Object detection ,Task (project management) ,DICOM ,Annotation ,Scalability ,Medical imaging ,General Earth and Planetary Sciences ,Artificial intelligence ,business ,General Environmental Science - Abstract
Current research on medical image processing relies heavily on the amount and quality of input data. Specifically, supervised machine learning methods require well-annotated datasets. A lack of annotation tools limits the potential to achieve high-volume processing and scaled systems with a proper reward mechanism. We developed MarkIt, a web-based tool, for collaborative annotation of medical imaging data with artificial intelligence and blockchain technologies. Our platform handles both Digital Imaging and Communications in Medicine (DICOM) and non-DICOM images, and allows users to annotate them for classification and object detection tasks in an efficient manner. MarkIt can accelerate the annotation process and keep track of user activities to calculate a fair reward. A proof-of-concept experiment was conducted with three fellowship-trained radiologists, each of whom annotated 1,000 chest X-ray studies for multi-label classification. We calculated the inter-rater agreement and estimated the value of the dataset to distribute the reward for annotators using a crypto currency. We hypothesize that MarkIt allows the typically arduous annotation task to become more efficient. In addition, MarkIt can serve as a platform to evaluate the value of data and trade the annotation results in a more scalable manner in the future. The platform is publicly available for testing on https://markit.mgh.harvard.edu.
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