15 results on '"Peidong Hua"'
Search Results
2. Long Distance Distributed Strain Sensing in OFDR by BM3D-SAPCA Image Denoising
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Ming Pan, Peidong Hua, Zhenyang Ding, Dongfang Zhu, Kun Liu, Junfeng Jiang, Chenhuan Wang, Haohan Guo, Teng Zhang, Sheng Li, and Tiegen Liu
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Atomic and Molecular Physics, and Optics - Published
- 2022
3. Elimination of Side Lobe Ghost Peak Using Wiener Deconvolution Filter in OFDR
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Haohan Guo, Peidong Hua, Zhenyang Ding, Yuanyao Li, Kun Liu, Junfeng Jiang, Chenhuan Wang, Ming Pan, Sheng Li, Teng Zhang, and Tiegen Liu
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Atomic and Molecular Physics, and Optics - Published
- 2022
4. Distributed optical fiber biosensor based on optical frequency domain reflectometry
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Peidong Hua, Zhenyang Ding, Kun Liu, Haohan Guo, Ming Pan, Teng Zhang, Sheng Li, Junfeng Jiang, and Tiegen Liu
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Electrochemistry ,Biomedical Engineering ,Biophysics ,General Medicine ,Biotechnology - Published
- 2023
5. Reconstruction error model of distributed shape sensing based on the reentered frame in OFDR
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Sheng Li, Peidong Hua, Zhenyang Ding, Kun Liu, Yong Yang, Junpeng Zhao, Ming Pan, Haohan Guo, Teng Zhang, Li Liu, Junfeng Jiang, and Tiegen Liu
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Atomic and Molecular Physics, and Optics - Abstract
At present, the reconstruction error of optical fiber shape sensing is commonly represented by Euclidean distance error. However, the Euclidian error of shape reconstruction will be dependent on the shape complexity, which depends on length, curvature and torsion. In this paper, we establish a reconstruction error model of distributed shape sensing in optical frequency domain reflectometry (OFDR) based on the Frenet-Serret frame and the error delivering theory, which illustrates the relationship between the reconstruction error and parameters such as curvature, torsion, fiber length and strain measurement error. We experimentally verify the feasibility and applicability of the proposed reconstruction error model by distributed optical fiber shape sensing system based on OFDR. The proposed reconstruction error model can provide a prediction of the maximal reconstruction error when the estimated range of curvature, torsion, fiber length of a shape needs to be reconstructed and strain measurement errors of OFDR system are known. It is very useful to judge whether the shape reconstruction error meets the requirement according to the shape to be reconstructed.
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- 2022
6. Complete self-calibration compact binary magneto-optic rotator based Mueller matrix polarimetry
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Kun Liu, Tiegen Liu, Chenhuan Wang, Junfeng Jiang, Yin Yu, Zhenyang Ding, Peidong Hua, and X. Steve Yao
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Optical axis ,Physics ,Spectrum analyzer ,Accuracy and precision ,Optics ,business.industry ,Polarimetry ,Phase (waves) ,Calibration ,Mueller calculus ,business ,Polarization (waves) ,Atomic and Molecular Physics, and Optics - Abstract
Magneto-optic (MO) based Mueller matrix polarimetry (MMP) has several advantages of compact size, no-mechanical movement and high speed. Inaccuracies of components in the polarization state generator (PSG) optical parameters will influence the measurement accuracy of MMP. In this paper, we present a PSG self-calibration method in the compact MMP based on binary MO polarization rotators. Since PSG can generate enough numbers of non-degenerate polarization states, the optical parameters in PSG and the Mueller matrix of the sample can totally be numerically solved, which realizes a self-calibration in the PSG. Combining the previous self-calibration method in polarization state analyzer (PSA), we realize a complete self-calibration compact MO based MMP. Based on the numerical simulation results, the errors of measured phase retardance and optical axis of the sample decrease two to three orders of magnitude after applying the PSG self-calibration method. In experimental results of a variable retarder as a sample, the Euclidean distance of retardance between the measurement and reference curves comparing PSG self-calibration with no PSG self-calibration can be reduced from 0.035 rad to 0.033 rad and the Euclidean distance of optical axis can be reduced from 3.39° to 1.51°. Compared with the experimental results, the numerical simulation results more accurately verify the performance of the presented PSG self-calibration method without being influenced by other errors because the Mueller matrix of the sample is known and the error source only comes from these components in PSG.
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- 2021
7. Automatic lumen segmentation using uniqueness of vascular connected region for intravascular optical coherence tomography
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Zhu Fengyu, Tiegen Liu, Jingqi Hu, Zhou Shanshan, Mingjian Shang, Qingrui Li, Zhenyang Ding, Tao Kuiyuan, Kuang Hao, Peidong Hua, Yin Yu, and Tian Feng
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Vascular wall ,Jaccard index ,medicine.diagnostic_test ,Computer science ,business.industry ,General Engineering ,General Physics and Astronomy ,Lumen segmentation ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology ,Tree traversal ,Optical coherence tomography ,Feature (computer vision) ,Medical imaging ,medicine ,General Materials Science ,Computer vision ,Uniqueness ,Artificial intelligence ,Artifacts ,business ,Algorithms ,Tomography, Optical Coherence - Abstract
We present an automatic lumen segmentation method using uniqueness of connected region for intravascular optical coherence tomography (IVOCT), which can effectively remove the effect on lumen segmentation caused by blood artifacts. Utilizing the uniqueness of vascular wall on A-lines, we detect the A-lines shared by multiple connected regions, identify connected regions generated by blood artifacts using traversal comparison of connected regions' location, shared ratio and area ratio and then remove all artifacts. We compare these three methods by 216 challenging images with severe blood artifacts selected from clinical 1076 IVOCT images. The metrics of the proposed method are evaluated including Dice index, Jaccard index and accuracy of 94.57%, 90.12%, 98.02%. Compared with automatic lumen segmentation based on the previous morphological feature method and widely used dynamic programming method, the metrics of the proposed method are significantly enhanced, especially in challenging images with severe blood artifacts.
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- 2021
8. Analysis and reduction of noise-induced depolarization in catheter based polarization sensitive optical coherence tomography
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Qingrui Li, Yin Yu, Zhenyang Ding, Fengyu Zhu, Yuanyao Li, Kuiyuan Tao, Peidong Hua, Tianduo Lai, Hao Kuang, and Tiegen Liu
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Catheters ,Refraction, Ocular ,Tomography, Optical Coherence ,Atomic and Molecular Physics, and Optics - Abstract
In catheter based polarization sensitive optical coherence tomography (PS-OCT), a optical fiber with a rapid rotation in the catheter can cause low signal-to-noise ratio (SNR), polarization state instability, phase change of PS-OCT signals and then heavy noise-induced depolarization, which has a strong impact on the phase retardation measurement of the sample. In this paper, we analyze the noise-induced depolarization and find that the effect of depolarization can be reduced by polar decomposition after incoherent averaging in the Mueller matrix averaging (MMA) method. Namely, MMA can reduce impact of noise on phase retardation mapping. We present a Monte Carlo method based on PS-OCT to numerically describe noise-induced depolarization effect and contrast phase retardation imaging results by MMA and Jones matrix averaging (JMA) methods. The peak signal to noise ratio (PSNR) of simulated images processed by MMA is higher than about 8.9 dB than that processed by JMA. We also implement experiments of multiple biological tissues using the catheter based PS-OCT system. From the simulation and experimental results, we find the polarization contrasts processed by the MMA are better than those by JMA, especially at areas with high depolarization, because the MMA can reduce effect of noise-induced depolarization on the phase retardation measurement.
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- 2022
9. Comparison of similar Mueller and Jones matrix method in catheter based polarization sensitive optical coherence tomography
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Peidong Hua, Tiegen Liu, Zhu Fengyu, Zhenyang Ding, Lai Tianduo, Qingrui Li, Tao Kuiyuan, Kuang Hao, and Yin Yu
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Physics ,medicine.diagnostic_test ,business.industry ,Physics::Medical Physics ,Phase (waves) ,Polarization (waves) ,Noise (electronics) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Signal-to-noise ratio ,Optics ,Optical coherence tomography ,medicine ,Mueller calculus ,Electrical and Electronic Engineering ,business ,Eigendecomposition of a matrix ,Matrix method - Abstract
Catheter based polarization sensitive optical coherence tomography (PS-OCT) can provide composition information of coronary atherosclerotic plaque beyond the intensity based OCT, but it encounters a notable challenge that is how to reduce polarization properties variations owing to a rapidly rotating optical fiber in the catheter. Similar Jones matrix (SJM) and similar Mueller matrix (SMM) based polarization determination methods can provide a stable phase retardation imaging in a catheter based PS-OCT. In this paper, we systematically contrast SJM and SMM methods. Firstly, we theoretically illustrate the discrepancy between the eigenvalue decomposition in SJM and the polar decomposition in SMM. We find the SMM can reduce phase retardation error caused by non-coaxial diattenuation using polar decomposition. Secondly, we present a real incoherent averaging method in SMM. We find that incoherent averaging in SMM avoids a time-consuming global phase collection and more effectively reduce noise compared with complex coherent averaging in SJM. By polarization imaging for multiple biological tissues using a catheter based PS-OCT, we experimentally manifest that the areas with high diattenuation are highly correlated to the difference between images processed by SJM and SMM. At the same time, the SMM with incoherent averaging has a better performance than the SJM with coherent averaging especially at areas with low signal to noise ratio (SNR).
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- 2022
10. Three-dimensional spatial reconstruction of coronary arteries based on fusion of intravascular optical coherence tomography and coronary angiography
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Jingqi Hu, Peidong Hua, Yin Yu, Zhu Yanan, Kuang Hao, Zhu Fengyu, Lai Tianduo, Tao Kuiyuan, Zhenyang Ding, Tiegen Liu, and Mingjian Shang
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Computer science ,General Physics and Astronomy ,Coronary Angiography ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,010309 optics ,Spatial reconstruction ,Imaging, Three-Dimensional ,Optical coherence tomography ,0103 physical sciences ,medicine ,Medical imaging ,General Materials Science ,Segmentation ,medicine.diagnostic_test ,010401 analytical chemistry ,General Engineering ,General Chemistry ,Digital subtraction angiography ,medicine.disease ,Coronary Vessels ,0104 chemical sciences ,body regions ,Coronary arteries ,Stenosis ,medicine.anatomical_structure ,Algorithms ,Tomography, Optical Coherence ,Lumen (unit) ,Biomedical engineering - Abstract
We present a three-dimensional (3D) spatial reconstruction of coronary arteries based on fusion of intravascular optical coherence tomography (IVOCT) and digital subtraction angiography (DSA). Centerline of vessel in DSA images is exacted by multi-scale filtering, adaptive segmentation, morphology thinning and Dijkstra's shortest path algorithm. We apply the cross-correction between lumen shapes of IVOCT and DSA images and match their stenosis positions to realize co-registration. By matching the location and tangent direction of the vessel centerline of DSA images and segmented lumen coordinates of IVOCT along pullback path, 3D spatial models of vessel lumen are reconstructed. Using 1121 distinct positions selected from eight vessels, the correlation coefficient between 3D IVOCT model and DSA image in measuring lumen radius is 0.94% and 97.7% of the positions fall within the limit of agreement by Bland-Altman analysis, which means that the 3D spatial reconstruction IVOCT models and DSA images have high matching level.
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- 2020
11. Potential biomarkers for predicting the overall survival outcome of kidney renal papillary cell carcinoma: an analysis of ferroptosis-related LNCRNAs
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Zixuan Wu, Xuyan Huang, Minjie Cai, and Peidong Huang
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Kidney renal papillary cell carcinoma (KIRP) ,Ferroptosis-related LNCRNAs ,TCGA datasets ,Immune cell infiltration ,Bioinformatics analysis ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Abstract Background Kidney renal papillary cell carcinoma (KIRP) is a dangerous cancer, which accounts for 15–20% of all kidney malignancies. Ferroptosis is a rare kind of cell death that overcomes medication resistance. Ferroptosis-related long non-coding RNAs (LNCRNAs) in KIRP, remain unknown. Method We wanted to express how ferroptosis-related LNCRNAs interact with immune cell infiltration in KIRP. Gene set enrichment analysis in the GO and KEGG databases were used to explore gene expression enrichment. The prognostic model was constructed using Lasso regression. In addition, we also analyzed the modifications in the tumor microenvironment (TME) and immunological association. Result The expression of LNCRNA was closely connected to the ferroptosis, according to co-expression analyses. CASC19, AC090197.1, AC099850.3, AL033397.2, LINC00462, and B3GALT1-AS1 were found to be significantly increased in the high-risk group, indicating that all of these markers implicates the malignancy processes for KIRP patients and may be cancer-promoting variables. LNCTAM34A and AC024022.1 were shown to be significantly elevated in the low-risk group; these might represent as the KIRP tumor suppressor genes. According to the TCGA, CCR, and inflammation-promoting genes were considered to be significantly different between the low-risk and high-risk groups. The expression of CD160, TNFSF4, CD80, BTLA, and TNFRSF9 was different in the two risk groups. Conclusion LNCRNAs associated with ferroptosis were linked to the occurrence and progression of KIRP. Ferroptosis-related LNCRNAs and immune cell infiltration in the TME may be potential biomarkers in KIRP that should be further investigated.
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- 2022
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12. Polyphenols: Natural food grade biomolecules for treating neurodegenerative diseases from a multi-target perspective
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Zhenmin Li, Ting Zhao, Mingqin Shi, Yuanyuan Wei, Xiaoyi Huang, Jiayan Shen, Xiaoyu Zhang, Zhaohu Xie, Peidong Huang, Kai Yuan, Zhaofu Li, Ning Li, and Dongdong Qin
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polyphenols ,antioxidant ,anti-inflammation ,neurodegenerative diseases ,efficacy ,mechanism ,Nutrition. Foods and food supply ,TX341-641 - Abstract
As natural functional bioactive ingredients found in foods and plants, polyphenols play various antioxidant and anti-inflammatory roles to prevent the development of disease and restore human health. The multi-target modulation of polyphenols provides a novel practical therapeutic strategy for neurodegenerative diseases that are difficult to treat with traditional drugs like glutathione and cholinesterase inhibitors. This review mainly focuses on the efficacy of polyphenols on ischemic stroke, Parkinson's disease and Alzheimer's disease, including in vivo and in vitro experimental studies. It is further emphasized that polyphenols exert neuroprotective effects primarily through inhibiting production of oxidative stress and inflammatory cytokines, which may be the underlying mechanism. However, polyphenols are still rarely used as medicines to treat neurodegenerative diseases. Due to the lack of clinical trials, the mechanism of polyphenols is still in the stage of insufficient exploration. Future large-scale multi-center randomized controlled trials and in-depth mechanism studies are still needed to fully assess the safety, efficacy and side effects of polyphenols.
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- 2023
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13. The environment, composition, and protection of Dazu rock inscriptions
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Peidong Hua and Yongxian Wang
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Mineral ,Silicon ,Metallurgy ,General Engineering ,Mineralogy ,chemistry.chemical_element ,Weathering ,engineering.material ,Permeability (earth sciences) ,Coating ,chemistry ,Air permeability specific surface ,Emulsion ,Earth and Planetary Sciences (miscellaneous) ,engineering ,General Earth and Planetary Sciences ,Environmental Chemistry ,Chemical composition ,Geology ,General Environmental Science ,Water Science and Technology - Abstract
The geography, atmosphere, rock mineral, and chemical composition of the Dazu Rock Inscriptions are described. The results suggest that the main type of weathering of the Dazu Rock Inscriptions is chemical. A new product, an acrylate-organic silicon nucleus/shell IPN Emulsion, is developed as an ideal protective material of the inscriptions because of its low contamination properties and low cost. It has the merits of organic silicon coating and polyacrylate coating, overcomes the "protective" damage made by the poor wet air permeability (24.0%) of polyacrylate coating, and a quick decrease in adhesive force of organic silicon coating.
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- 1998
14. Electroacupuncture Involved in Motor Cortex and Hypoglossal Neural Control to Improve Voluntary Swallowing of Poststroke Dysphagia Mice
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Shuai Cui, Shuqi Yao, Chunxiao Wu, Lulu Yao, Peidong Huang, Yongjun Chen, Chunzhi Tang, and Nenggui Xu
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Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
The descending motor nerve conduction of voluntary swallowing is mainly launched by primary motor cortex (M1). M1 can activate and regulate peripheral nerves (hypoglossal) to control the swallowing. Acupuncture at “Lianquan” acupoint (CV23) has a positive effect against poststroke dysphagia (PSD). In previous work, we have demonstrated that electroacupuncture (EA) could regulate swallowing-related motor neurons and promote swallowing activity in the essential part of central pattern generator (CPG), containing nucleus ambiguus (NA), nucleus of the solitary tract (NTS), and ventrolateral medulla (VLM) under the physiological condition. In the present work, we have investigated the effects of EA on the PSD mice in vivo and sought evidence for PSD improvement by electrophysiology recording and laser speckle contrast imaging (LSCI). Four main conclusions can be drawn from our study: (i) EA may enhance the local field potential in noninfarction area of M1, activate the swallowing-related neurons (pyramidal cells), and increase the motor conduction of noninfarction area in voluntary swallowing; (ii) EA may improve the blood flow in both M1 on the healthy side and deglutition muscles and relieve PSD symptoms; (iii) EA could increase the motor conduction velocity (MCV) in hypoglossal nerve, enhance the EMG of mylohyoid muscle, alleviate the paralysis of swallowing muscles, release the substance P, and restore the ability to drink water; and (iv) EA can boost the functional compensation of M1 in the noninfarction side, strengthen the excitatory of hypoglossal nerve, and be involved in the voluntary swallowing neural control to improve PSD. This research provides a timely and necessary experimental evidence of the motor neural regulation in dysphagia after stroke by acupuncture in clinic.
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- 2020
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15. Age-Related Changes in the Plasticity of Neural Networks Assessed by Transcranial Magnetic Stimulation With Electromyography: A Systematic Review and Meta-Analysis
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Xiaorong Tang, Peidong Huang, Yitong Li, Juanchao Lan, Zhonghua Yang, Mindong Xu, Wei Yi, Liming Lu, Lin Wang, and Nenggui Xu
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plasticity of neural networks ,age-related ,transcranial magnetic stimulation ,resting motor threshold ,meta-analysis ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Objective: The excitability of cerebral cortical cells, neural pathway, and neural networks, as well as their plasticity, are key to our exploration of age-related changes in brain structure and function. The combination of transcranial magnetic stimulation (TMS) with electromyography (EMG) can be applied to the primary motor cortex; it activates the underlying neural group and passes through the corticospinal pathway, which can be quantified using EMG. This meta-analysis aimed to analyze changes in cortical excitability and plasticity in healthy elderly individuals vs. young individuals through TMS-EMG.Methods: The Cochrane Library, Medline, and EMBASE databases were searched to identify eligible trials published from database inception to June 3, 2019. The Cochrane Risk of Bias Tool and improved Jadad scale were used to assess the methodological quality. A meta-analysis of the comparative effects was conducted using the Review Manager 5.3 software and Stata 14.0 software.Results: The pooled results revealed that the resting motor threshold values in the elderly group were markedly higher than those reported in the young group (mean difference [MD]: −2.35; 95% confidence interval [CI]: −3.69 to −1.02]; p < (0.00001). The motor evoked potential amplitude significantly reduced in the elderly group vs. the young group (MD: 0.18; 95% CI: 0.09–0.27; p < 0.0001). Moreover, there was significantly longer motor evoked potential latency in the elderly group (MD: −1.07; 95% CI: −1.77 to −0.37]; p =(0.003). There was no significant difference observed in the active motor threshold between the elderly and young groups (MD: −1.52; 95% CI: −3.47 to −0.42]; p =(0.13). Meanwhile, only two studies reported the absence of adverse events.Conclusion: We found that the excitability of the cerebral cortex declined in elderly individuals vs. young individuals. The findings of the present analysis should be considered with caution owing to the methodological limitations in the included trials. Additional high-quality studies are warranted to validate our findings.
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- 2019
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