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1,767 results on '"Yang, Shang"'

3. Super-Resolution Surface Reconstruction from Few Low-Resolution Slices

Author

Zhang, Yiyao, Chen, Ke, and Yang, Shang-Hua

Subjects
Mathematics - Analysis of PDEs, Computer Science - Computer Vision and Pattern Recognition, 49Q20, 65K10, 65D18, 94A08, 68U10
Abstract

In many imaging applications where segmented features (e.g. blood vessels) are further used for other numerical simulations (e.g. finite element analysis), the obtained surfaces do not have fine resolutions suitable for the task. Increasing the resolution of such surfaces becomes crucial. This paper proposes a new variational model for solving this problem, based on an Euler-Elastica-based regulariser. Further, we propose and implement two numerical algorithms for solving the model, a projected gradient descent method and the alternating direction method of multipliers. Numerical experiments using real-life examples (including two from outputs of another variational model) have been illustrated for effectiveness. The advantages of the new model are shown through quantitative comparisons by the standard deviation of Gaussian curvatures and mean curvatures from the viewpoint of discrete geometry., Comment: 33 pages, 25 figures

Published
2023
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21. Age-dependent sex differences in non-stenotic intracranial plaque of embolic stroke of undetermined source

Author

Na Luo, Zi-Yang Shang, Ben-Qiang Yang, George Ntaios, and Hui-Sheng Chen

Subjects
Medicine, Science
Abstract

Abstract Age and sex have effect on atherosclerosis. This study aimed to investigate their effect on non-stenotic intracranial atherosclerotic plaque (NIAP) in embolic stroke of undetermined source (ESUS) using high-resolution magnetic resonance imaging (HR-MRI). We retrospectively recruited consecutive ESUS patients who underwent intracranial HR-MRI to assess the plaque characteristics (remodeling index [RI], plaque burden [PB], fibrous cap [FC], discontinuity of plaque surface [DPS], intraplaque hemorrhage [IPH] and complicated plaque [CP]). We divided patients into three groups ( 0.05). In age group of 60–74 years, men were associated with higher PB (66.27 ± 9.17% vs 60.91 ± 8.86%, p = 0.017) and RI (1.174 vs 1.156, p = 0.019), higher prevalence of DPS (82.50% vs 60.00%, p = 0.036) and complicated plaque (85.00% vs 63.33%, p = 0.036). For subjects ≥ 75 years old, PB were significantly higher in twomen vs men (68.85 ± 6.14% vs 62.62 ± 7.36%, p = 0.040). In addition, the probability for PBupper (≥ median PB), RIupper (≥ median RI) and vulnerable plaque increased as age increased, and its predictive power for index ESUS was higher in men than women. This study identified age-dependent sex differences in NIAP characteristics of ESUS patients, which will help us clarify their etiology.

Published
2023
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22. The association of intracranial atherosclerosis with cerebral small vessel disease imaging markers: a high-resolution magnetic resonance imaging study

Author

Kang-Li Zhu, Zi-Yang Shang, Bai-jun Liu, Ying Wang, Jing Li, Ben-Qiang Yang, George Ntaios, and Hui-Sheng Chen

Subjects
Medicine, Science
Abstract

Abstract To evaluate the association of intracranial non-stenotic atherosclerotic plaque with cerebral small vessel disease (CSVD) imaging markers in a CSVD population using 3.0 T high-resolution magnetic resonance imaging (HRMRI), which was validated in embolic stroke of undetermined source (ESUS) cohort. We retrospectively recruited consecutive patients who were diagnosed with CSVD or ESUS from January 2015 to December 2019. All patients underwent intracranial HRMRI to assess intracranial non-stenotic atherosclerotic plaques. Baseline and imaging data were collected and were measured among all patients. Among 153 patients with CSVD, there were 59 with intracranial atherosclerotic plaque (IAP) and 94 with non-IAP, including 36 with intracranial atherosclerotic complicated plaque (IACP). Among 227 ESUS patients, there were 155 with IAP and 72 with non-IAP, including 127 with IACP. In the CSVD population, we found that: (1) CSVD burden was associated with IAP (p = 0.036) and IACP (p = 0.008); (2) IAP was associated with white matter hyperintensity (51% vs. 34%; P = 0.039), and IACP was associated with lacunes (69% vs. 35%; P = 0.009) and enlarge perivascular space (69% vs. 39%; P = 0.022). A similar association of CSVD imaging markers with IAP or IACP was found in the ESUS population. Furthermore, the association of unilateral IAP or IACP with CSVD imaging markers of ipsilateral hemisphere was identified in the two cohorts. This is the first report that intracranial non-stenotic atherosclerotic plaque, especially complicated plaque, is closely associated with CSVD imaging markers, which provide further evidence for the association of large artery atherosclerosis with CSVD.

Published
2023
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48. Overcoming small-bandgap charge recombination in visible and NIR-light-driven hydrogen evolution by engineering the polymer photocatalyst structure

Author

Elsayed, Mohamed Hammad, Abdellah, Mohamed, Alhakemy, Ahmed Zaki, Mekhemer, Islam M. A., Aboubakr, Ahmed Esmail A., Chen, Bo-Han, Sabbah, Amr, Lin, Kun-Han, Chiu, Wen-Sheng, Lin, Sheng-Jie, Chu, Che-Yi, Lu, Chih-Hsuan, Yang, Shang-Da, Mohamed, Mohamed Gamal, Kuo, Shiao-Wei, Hung, Chen-Hsiung, Chen, Li-Chyong, Chen, Kuei-Hsien, and Chou, Ho-Hsiu

Published
2024
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