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321 results on '"Subhas, Naveen"'

56. 3D MRI of the Knee

Author

Altahawi, Faysal, additional, Pierce, Jason, additional, Aslan, Mercan, additional, Li, Xiaojuan, additional, Winalski, Carl S., additional, and Subhas, Naveen, additional

Published
2021
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61. Validation of a 3D CT imaging method for quantifying implant migration following anatomic total shoulder arthroplasty.

Author

Jun, Bong‐Jae, Ricchetti, Eric T., Haladik, Jeffrey, Bey, Michael J., Patterson, Thomas E., Subhas, Naveen, Li, Zong‐Ming, and Iannotti, Joseph P.

Subjects
TOTAL shoulder replacement, RADIOSTEREOMETRY, THREE-dimensional imaging, COMPUTED tomography, STANDARD deviations, IN vivo studies
Abstract

Glenoid component loosening remains a common complication following anatomic total shoulder arthroplasty (TSA); however, plain radiographs are unable to accurately detect early implant migration. The purpose of this study was to validate the accuracy of a method of postoperative, three‐dimensional (3D) computed tomography (CT) imaging with metal artifact reduction (MAR) to detect glenoid component migration following anatomic TSA. Tantalum bead markers were inserted into polyethylene glenoid components for implant detection on 3D CT. In‐vitro validation was performed using a glenoid component placed into a scapula sawbone and incrementally translated and rotated, with MAR 3D CT acquired at each test position. Accuracy was evaluated by root mean square error (RMSE). In‐vivo validation was performed on six patients who underwent anatomic TSA, with two postoperative CT scans acquired in each patient and marker‐based radiostereometric analysis (RSA) performed on the same days. Glenoid component migration was calculated relative to a scapular coordinate system for both MAR 3D CT and RSA. Accuracy was evaluated by RMSE and paired Student's t‐tests. The largest RMSE on in‐vitro testing was 0.24 mm in translation and 0.11° in rotation, and on in‐vivo testing was 0.47 mm in translation and 1.04° in rotation. There were no significant differences between MAR 3D CT and RSA measurement methods. MAR 3D CT imaging is capable of quantifying glenoid component migration with a high level of accuracy. MAR 3D CT imaging is advantageous over RSA because it is readily available clinically and can also be used to evaluate the implant‐bone interface. [ABSTRACT FROM AUTHOR]

Published
2022
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65. Diagnostic interchangeability of deep convolutional neural networks reconstructed knee MR images: preliminary experience

Author

Subhas, Naveen, primary, Li, Hongyu, additional, Yang, Mingrui, additional, Winalski, Carl S., additional, Polster, Joshua, additional, Obuchowski, Nancy, additional, Mamoto, Kenji, additional, Liu, Ruiying, additional, Zhang, Chaoyi, additional, Huang, Peizhou, additional, Gaire, Sunil Kumar, additional, Liang, Dong, additional, Shen, Bowen, additional, Li, Xiaojuan, additional, and Ying, Leslie, additional

Published
2020
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70. Diagnostic interchangeability of deep convolutional neural networks reconstructed knee MR images: preliminary experience

Author

Computer Science, Subhas, Naveen, Li, Hongyu, Yang, Mingrui, Winalski, Carl S., Polster, Joshua, Obuchowski, Nancy, Mamoto, Kenji, Liu, Ruiying, Zhang, Chaoyi, Huang, Peizhou, Gaire, Sunil Kumar, Liang, Dong, Shen, Bowen, Xiaojuan, Li, Ying, Leslie, Computer Science, Subhas, Naveen, Li, Hongyu, Yang, Mingrui, Winalski, Carl S., Polster, Joshua, Obuchowski, Nancy, Mamoto, Kenji, Liu, Ruiying, Zhang, Chaoyi, Huang, Peizhou, Gaire, Sunil Kumar, Liang, Dong, Shen, Bowen, Xiaojuan, Li, and Ying, Leslie

Abstract

Background: MRI acceleration using deep learning (DL) convolutional neural networks (CNNs) is a novel technique with great promise. Increasing the number of convolutional layers may allow for more accurate image reconstruction. Studies on evaluating the diagnostic interchangeability of DL reconstructed knee magnetic resonance (MR) images are scarce. The purpose of this study was to develop a deep CNN (DCNN) with an optimal number of layers for accelerating knee magnetic resonance imaging (MRI) acquisition by 6-fold and to test the diagnostic interchangeability and image quality of nonaccelerated images versus images reconstructed with a 15-layer DCNN or 3-layer CNN. Methods: For the feasibility portion of this study, 10 patients were randomly selected from the Osteoarthritis Initiative (OAI) cohort. For the interchangeability portion of the study, 40 patients were randomly selected from the OAI cohort. Three readers assessed meniscal and anterior cruciate ligament (ACL) tears and cartilage defects using DCNN, CNN, and nonaccelerated images. Image quality was subjectively graded as nondiagnostic, poor, acceptable, or excellent. Interchangeability was tested by comparing the frequency of agreement when readers used both accelerated and nonaccelerated images to frequency of agreement when readers only used nonaccelerated images. A noninferiority margin of 0.10 was used to ensure type I error <= 5% and power >= 80%. A logistic regression model using generalized estimating equations was used to compare proportions; 95% confidence intervals (CIs) were constructed. Results: DCNN and CNN images were interchangeable with nonaccelerated images for all structures, with excess disagreement values ranging from -2.5% [95% CI: (-6.1, 1.1)] to 3.0% [95% CI: (-0.1, 6.1)]. The quality of DCNN images was graded higher than that of CNN images but less than that of nonaccelerated images [excellent/acceptable quality: DCNN, 95% of cases (114/120); CNN, 60% (72/120); nonaccelerated, 97.5%

Published
2020

74. ACR Appropriateness Criteria® Chronic Foot Pain.

Author

Expert Panel on Musculoskeletal Imaging, Tafur, Monica, Bencardino, Jenny T, Roberts, Catherine C, Appel, Marc, Bell, Angela M, Gyftopoulos, Soterios, Metter, Darlene F, Mintz, Douglas N, Morrison, William B, Small, Kirstin M S, Subhas, Naveen, Weissman, Barbara N, Yu, Joseph S, and Kransdorf, Mark J

Abstract

Chronic foot pain is a frequent clinical complaint, which can significantly impact the quality of live in some individuals. These guidelines define best practices with regards to requisition of imaging studies based on specific clinical scenarios, which have been grouped into different variants. Each variant is accompanied by a brief description of the usefulness, advantages, and limitations of different imaging modalities. The present narrative is the result of an exhaustive assessment of the available literature and a thorough review process by a panel of experts on Musculoskeletal Imaging. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment. [ABSTRACT FROM AUTHOR]

Published
2020
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79. ACR Appropriateness Criteria ® Chronic Wrist Pain

Author

Rubin, David A., primary, Roberts, Catherine C., additional, Bencardino, Jenny T., additional, Bell, Angela M., additional, Cassidy, R. Carter, additional, Chang, Eric Y., additional, Gyftopoulos, Soterios, additional, Metter, Darlene F., additional, Morrison, William B., additional, Subhas, Naveen, additional, Tambar, Siddharth, additional, Towers, Jeffrey D., additional, Yu, Joseph S., additional, and Kransdorf, Mark J., additional

Published
2018
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84. ACR Appropriateness Criteria ® Chronic Hip Pain

Author

Mintz, Douglas N., primary, Roberts, Catherine C., additional, Bencardino, Jenny T., additional, Baccei, Steven J., additional, Caird, Michelle S., additional, Cassidy, R. Carter, additional, Chang, Eric Y., additional, Fox, Michael G., additional, Gyftopoulos, Soterios, additional, Kransdorf, Mark J., additional, Metter, Darlene F., additional, Morrison, William B., additional, Rosenberg, Zehava S., additional, Shah, Nehal A., additional, Small, Kirstin M., additional, Subhas, Naveen, additional, Tambar, Siddharth, additional, Towers, Jeffrey D., additional, Yu, Joseph S., additional, and Weissman, Barbara N., additional

Published
2017
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91. ACR Appropriateness Criteria® Shoulder Pain-Atraumatic.

Author

Expert Panel on Musculoskeletal Imaging:, Small, Kirstin M, Adler, Ronald S, Shah, Shaan H, Roberts, Catherine C, Bencardino, Jenny T, Appel, Marc, Gyftopoulos, Soterios, Metter, Darlene F, Mintz, Douglas N, Morrison, William B, Subhas, Naveen, Thiele, Ralf, Towers, Jeffrey D, Tynus, Katherine M, Weissman, Barbara N, Yu, Joseph S, and Kransdorf, Mark J

Abstract

Shoulder pain is one of the most common reasons for musculoskeletal-related physician visits. Imaging plays an important role in identifying the specific cause of atraumatic shoulder pain. This review is divided into two parts. The first part provides a general discussion of various imaging modalities (radiographs, arthrography, nuclear medicine, ultrasound, CT, and MRI) and their usefulness in evaluating atraumatic shoulder pain. The second part focuses on the most appropriate imaging algorithms for specific shoulder conditions including: rotator cuff disorders, labral tear/instability, bursitis, adhesive capsulitis, biceps tendon abnormalities, postoperative rotator cuff tears, and neurogenic pain. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment. [ABSTRACT FROM AUTHOR]

Published
2018
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92. CT Imaging of Hip and Shoulder Arthroplasties: Is Higher Dose Always Better?

Author

Subhas, Naveen

Subjects
Musculoskeletal joint, Technical aspects, Prostheses, CT
Abstract

Purpose Methods and Materials Results Conclusion References Personal Information, Purpose: Background •Causes of metal artifact –Photon starvation –Scatter –Partial volume averaging –Beam hardening •Contributing factors –Type of metal –Size/Shape –Orientation •Standard techniques to reduce metal artifact 1,2...

Published
2012
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95. Metal Artifact Reduction

Author

Gupta, Amit, primary, Subhas, Naveen, additional, Primak, Andrew N., additional, Nittka, Mathias, additional, and Liu, Kecheng, additional

Published
2015
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96. Comparison of a fast 5-min knee MRI protocol with a standard knee MRI protocol: a multi-institutional multi-reader study.

Author

Alaia, Erin FitzGerald, Benedick, Alex, Obuchowski, Nancy A., Polster, Joshua M., Beltran, Luis S., Schils, Jean, Garwood, Elisabeth, Burke, Christopher J., Chang, I-Yuan Joseph, Gyftopoulos, Soterios, and Subhas, Naveen

Subjects
KNEE diseases, KNEE, DIAGNOSIS of musculoskeletal system diseases, MEDICAL radiology, MEDICAL protocols, MAGNETIC resonance imaging, COMPARATIVE studies, KNEE injuries, RESEARCH methodology, MEDICAL cooperation, RESEARCH, EVALUATION research, RETROSPECTIVE studies
Abstract

Purpose: To compare diagnostic performance of a 5-min knee MRI protocol to that of a standard knee MRI.Materials and Methods: One hundred 3 T (100 patients, mean 38.8 years) and 50 1.5 T (46 patients, mean 46.4 years) MRIs, consisting of 5 fast, 2D multi-planar fast-spin-echo (FSE) sequences and five standard multiplanar FSE sequences, from two academic centers (1/2015-1/2016), were retrospectively reviewed by four musculoskeletal radiologists. Agreement between fast and standard (interprotocol agreement) and between standard (intraprotocol agreement) readings for meniscal, ligamentous, chondral, and bone pathology was compared for interchangeability. Frequency of major findings, sensitivity, and specificity was also tested for each protocol.Results: Interprotocol agreement using fast MRI was similar to intraprotocol agreement with standard MRI (83.0-99.5%), with no excess disagreement (≤ 1.2; 95% CI, -4.2 to 3.8%), across all structures. Frequency of major findings (1.1-22.4% across structures) on fast and standard MRI was not significantly different (p ≥ 0.215), except more ACL tears on fast MRI (p = 0.021) and more cartilage defects on standard MRI (p < 0.001). Sensitivities (59-100%) and specificities (73-99%) of fast and standard MRI were not significantly different for meniscal and ligament tears (95% CI for difference, -0.08-0.08). For cartilage defects, fast MRI was slightly less sensitive (95% CI for difference, -0.125 to -0.01) but slightly more specific (95% CI for difference, 0.01-0.5) than standard MRI.Conclusion: A fast 5-min MRI protocol is interchangeable with and has similar accuracy to a standard knee MRI for evaluating internal derangement of the knee. [ABSTRACT FROM AUTHOR]

Published
2018
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99. Radiologic Case Study

Author

Tyson, Scott, primary, Delzell, Patricia, additional, Subhas, Naveen, additional, and Sundaram, Murali, additional

Published
2012
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