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228 results on '"Yang, Dong Hyun"'

8. Low- or standard-dose edoxaban versus antiplatelet therapy for leaflet thrombus and cerebral thromboembolism after TAVR: A prespecified analysis of randomized ADAPT-TAVR trial

Author

Kim, Mijin, Ahn, Jung-Min, Kang, Do-Yoon, Kim, Min-Ju, Kim, Kyung Won, Koo, Hyun Jung, Yang, Dong Hyun, Jung, Seung Chai, Kim, Byungjun, Wong, Yiu Tung Anthony, Lam, Cheung Chi Simon, Yin, Wei‐Hsian, Wei, Jeng, Lee, Yung-Tsai, Kao, Hsien-Li, Lin, Mao-Shin, Yu Ko, Tsung, Kim, Won-Jang, Kang, Se Hun, Lee, Seung-Ah, Ko, Euihong, Kim, Dae-Hee, Kang, Joon-Won, Lee, Jae-Hong, Lee, Jinho, Park, Jinsun, Kim, Hoyun, Choi, Yeonwoo, Park, Seung-Jung, and Park, Duk-Woo

Published
2024
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11. Frequency, Predictors, and Clinical Impact of Valvular and Perivalvular Thrombus After Transcatheter Aortic Valve Replacement

Author

Choi, Yeonwoo, Ahn, Jung-Min, Kang, Do-Yoon, Kim, Hwa Jung, Kim, Hoyun, Lee, Jinho, Kim, Mijin, Park, Jinsun, Kim, Kyung Won, Koo, Hyun Jung, Yang, Dong Hyun, Jung, Seung Chai, Kim, Byungjun, Anthony Wong, Yiu Tung, Simon Lam, Cheung Chi, Yin, Wei-Hsian, Wei, Jeng, Lee, Yung-Tsai, Kao, Hsien-Li, Lin, Mao-Shin, Ko, Tsung-Yu, Kim, Won-Jang, Kang, Se Hun, Lee, Seung-Ah, Kim, Dae-Hee, Lee, Jae-Hong, Park, Seung-Jung, and Park, Duk-Woo

Published
2023
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12. Effect of Edoxaban Versus Antiplatelet Therapy on Leaflet Thrombosis and Cerebral Thromboembolism After TAVI According to Major Clinical and Anatomic Factors in Prespecified Subgroup Analysis from the ADAPT-TAVR Trial

Author

Lee, Jeen Hwa, Ahn, Jung-Min, Kang, Do-Yoon, Kim, Kyung Won, Koo, Hyun Jung, Yang, Dong Hyun, Jung, Seung Chai, Kim, Byungjun, Wong, Yiu Tung Anthony, Lam, Cheung Chi Simon, Yin, Wei‐Hsian, Wei, Jeng, Lee, Yung-Tsai, Kao, Hsien-Li, Lin, Mao-Shin, Ko, Tsung-Yu, Kim, Won-Jang, Kang, Se Hun, Yun, Sung-Cheol, Ko, Euihong, Park, Hanbit, Lee, Seung-Ah, Kim, Dae-Hee, Park, Seung-Jung, and Park, Duk-Woo

Published
2023
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17. Myocardial Scar and Revascularization on Mortality in Ischemic Cardiomyopathy (from the Late Gadolinium Enhancement Cardiac Magnetic Resonance Study)

Author

Park, Hanbit, Kang, Do-Yoon, Ahn, Jung-Min, Yang, Dong Hyun, Koo, Hyun Jung, Kang, Joon-Won, Lee, Pil Hyung, Lee, Sang Eun, Kim, Min-Seok, Kang, Soo-Jin, Park, Duk-Woo, Lee, Seung-Whan, Kim, Young-Hak, Lee, Cheol Whan, Kim, Ho Jin, Kim, Joon Bum, Jung, Sung Ho, Choo, Suk Jung, Chung, Cheol-Hyun, Lee, Jae-Won, Kim, Jae-Joong, Park, Seong-Wook, and Park, Seung-Jung

Published
2023
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20. Cycle Consistent Adversarial Denoising Network for Multiphase Coronary CT Angiography

Author

Kang, Eunhee, Koo, Hyun Jung, Yang, Dong Hyun, Seo, Joon Bum, and Ye, Jong Chul

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Artificial Intelligence, Computer Science - Machine Learning, Statistics - Machine Learning
Abstract

In coronary CT angiography, a series of CT images are taken at different levels of radiation dose during the examination. Although this reduces the total radiation dose, the image quality during the low-dose phases is significantly degraded. To address this problem, here we propose a novel semi-supervised learning technique that can remove the noises of the CT images obtained in the low-dose phases by learning from the CT images in the routine dose phases. Although a supervised learning approach is not possible due to the differences in the underlying heart structure in two phases, the images in the two phases are closely related so that we propose a cycle-consistent adversarial denoising network to learn the non-degenerate mapping between the low and high dose cardiac phases. Experimental results showed that the proposed method effectively reduces the noise in the low-dose CT image while the preserving detailed texture and edge information. Moreover, thanks to the cyclic consistency and identity loss, the proposed network does not create any artificial features that are not present in the input images. Visual grading and quality evaluation also confirm that the proposed method provides significant improvement in diagnostic quality., Comment: This work is accepted in Medical Physics

Published
2018
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28. Reference ranges of computed tomography-derived strains in four cardiac chambers.

Author

Ahn, Yura, Koo, Hyun Jung, Lee, Seung Ah, Jung, DaSol, Kang, Joon-Won, and Yang, Dong Hyun

Subjects
GLOBAL longitudinal strain, CARDIOGRAPHIC tomography, ECHOCARDIOGRAPHY, MYOCARDIAL perfusion imaging, HEART diseases, ABSOLUTE value
Abstract

Research on cardiovascular diseases using CT-derived strain is gaining momentum, yet there is a paucity of information regarding reference standard values beyond echocardiography, particularly in cardiac chambers other than the left ventricle (LV). We aimed to compile CT-derived strain values from the four cardiac chambers in healthy adults and assess the impact of age and sex on myocardial strains. This study included 101 (mean age: 55.2 ± 9.0 years, 55.4% men) consecutive healthy individuals who underwent multiphase cardiac CT. CT-derived cardiac strains, including LV global and segmental longitudinal, circumferential, and transverse strains, left atrial (LA), right atrial (RA), and right ventricle (RV) strains were measured by the commercially available software. Strain values were classified and compared by their age and sex. The normal range of CT-derived LV global longitudinal strain (GLS), global circumferential strain (GCS), and global radial strain (GRS) were −20.2 ± 2.7%, −27.9 ± 4.1%, and 49.4 ± 12.1%, respectively. For LA, reservoir strain, pump strain, and conduit strain were 28.6 ± 8.5%, 13.2 ± 6.4%, and 15.5 ± 8.6%, respectively. The GLS of RA and RV were 27.9 ± 10.9% and −22.0 ± 5.7%, respectively. The absolute values of GLS of RA and RV of women were higher than that in men (32.4 ± 11.4 vs. 24.3 ± 9.1 and −25.2 ± 4.7 vs. −19.4 ± 5.0, respectively; p<0.001, both). Measurement of CT-derived strain in four cardiac chambers is feasible. The reference ranges of CT strains in four cardiac chambers can be used for future studies of various cardiac diseases using the cardiac strains. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Edoxaban Versus Dual Antiplatelet Therapy for Leaflet Thrombosis and Cerebral Thromboembolism After TAVR: The ADAPT-TAVR Randomized Clinical Trial

Author

Park, Duk-Woo, Ahn, Jung-Min, Kang, Do-Yoon, Kim, Kyung Won, Koo, Hyun Jung, Yang, Dong Hyun, Jung, Seung Chai, Kim, Byungjun, Wong, Yiu Tung Anthony, Lam, Cheung Chi Simon, Yin, Wei-Hsian, Wei, Jeng, Lee, Yung-Tsai, Kao, Hsien-Li, Lin, Mao-Shin, Ko, Tsung-Yu, Kim, Won-Jang, Kang, Se Hun, Yun, Sung-Cheol, Lee, Seung-Ah, Ko, Euihong, Park, Hanbit, Kim, Dae-Hee, Kang, Joon-Won, Lee, Jae-Hong, and Park, Seung-Jung

Published
2022
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40. Left Atrium Volume Measured with Multislice Computed Tomography as a Prognostic Predictor for Atrial Fibrillation Catheter Ablation Outcomes.

Author

Park, Jae-Hong, Yang, Dong-Hyun, Kim, Ji-Hyun, and Kim, Yoo-Ri

Subjects
*ATRIAL fibrillation, *CATHETER ablation, *LEFT heart atrium, *PROGNOSTIC models, *COMPUTED tomography
Abstract

Background: Current guidelines consider atrial fibrillation (AF) type as the prognostic factor for a recommendation of catheter ablation. We aimed to determine whether LA and LA appendage (LAA) volumes measured using multislice computed tomography (MSCT) were related to long-term outcomes in AF following radiofrequency catheter ablation (RFCA). Methods: We evaluated 152 consecutive patients with drug-refractory AF (median age, 55.8 ± 9.6 years), including 110 male patients, who underwent RFCA in a single center. All patients underwent MSCT imaging for anatomical assessment. The endpoint of this study was documented AF recurrence after RFCA. Results: The overall procedure success rate was 77.6% (n = 118) during a mean follow-up period of 12.6 months. The LA volume was significantly larger for those who experienced AF recurrence after RFCA than for the patients without recurrent AF after the procedure (153.8 ± 29.9 mL vs. 139.2 ± 34.1 mL, p = 0.025). However, LAA volumes were nearly equivalent between the patients with and without AF recurrence after RFCA (16.2 ± 6.3 mL and 14.7 ± 6.5 mL, respectively; p = 0.235). LA volume ≥ 153.2 mL was the optimal cutoff value for estimating AF recurrence after RFCA, with 94% sensitivity and 66% specificity. LA volume remained an independent predictor of both AF recurrence and permanent AF. Conclusions: LA volume as assessed by MSCT might be helpful for identifying patients likely to achieve successful AF ablation. LA volume ≥ 153.2 mL, but not LAA volume, showed good accuracy in predicting AF recurrence after RFCA. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Fate of Grafts Bypassing Nonischemic Versus Ischemic Inducing Coronary Stenosis

Author

Roh, Jae-Hyung, Kim, Young-Hak, Yang, Dong Hyun, Han, Seungbong, Yun, Sung-Cheol, Yang, Dong Heon, Park, Gyung-Min, Lee, Pil Hyung, Ahn, Jung-Min, Kang, Joon-Won, Lim, Tae-Hwan, Moon, Dae Hyuk, Kim, Joon Bum, Jung, Sung-Ho, Chung, Cheol Hyun, Choo, Suk Jung, Lee, Jae Won, Kang, Soo-Jin, Park, Duk-Woo, Lee, Seung-Whan, Lee, Cheol Whan, Park, Seong-Wook, and Park, Seung-Jung

Published
2018
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43. Prediabetes is not a risk factor for subclinical coronary atherosclerosis

Author

Park, Gyung-Min, Cho, Young-Rak, Lee, Seung-Whan, Yun, Sung-Cheol, Won, Ki-Bum, Ann, Soe Hee, Kim, Yong-Giun, Kim, Shin-Jae, Roh, Jae-Hyung, Kim, Young-Hak, Yang, Dong Hyun, Kang, Joon-Won, Lim, Tae-Hwan, Jung, Chang Hee, Koh, Eun Hee, Lee, Woo Je, Kim, Min-Seon, Lee, Ki-Up, Park, Joong-Yeol, Kim, Hong-Kyu, Choe, Jaewon, and Lee, Sang-Gon

Published
2017
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44. Risk of New Native-Vessel Occlusion After Coronary Artery Bypass Grafting

Author

Yoon, Sung-Han, Kim, Young-Hak, Yang, Dong Hyun, Roh, Jae-Hyung, Lee, Eun Young, Lee, Pil Hyung, Sugiyama, Daisuke, Chang, Mineok, Ahn, Jung-Min, Choi, Won Jin, Kang, Joon-Won, Lim, Tae-Hwan, Kim, Joon Bum, Jung, Sung-Ho, Chung, Cheol Hyun, Choo, Suk Jung, Lee, Jae Won, Kang, Soo-Jin, Park, Duk-Woo, Lee, Seung-Whan, Lee, Cheol Whan, Park, Seong-Wook, and Park, Seung-Jung

Published
2017
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47. Denoising four-dimensional flow magnetic resonance imaging data using a split-and-overlap approach via singular value decomposition.

Author

Kang, Seungmin, An, Don-Gwan, Ha, Hojin, Yang, Dong Hyun, Jang, Ilhoon, and Song, Simon

Subjects
SINGULAR value decomposition, MAGNETIC resonance imaging, NOISE control, ROOT-mean-squares, FLUID dynamics
Abstract

Four-dimensional flow magnetic resonance imaging (4D flow MRI) offers a powerful tool for visualizing fluid flows, critical for both diagnosing cardiovascular diseases and analyzing engineering fluid dynamics. Despite its potential in medical research, the clinical applicability of 4D flow MRI often faces challenges due to inherent noise. To mitigate this, we introduce the split-and-overlap singular value decomposition (SOSVD) filter, a distinctive noise reduction approach. Unlike traditional singular value decomposition methods, the SOSVD filter partitions the primary data matrix into overlapping subdomains and then applies singular value decomposition to each subdomain, preserving only the dominant mode for noise attenuation. Evaluations on simulated and experimental flow data within a square duct revealed a significant decrease in root mean square noise metrics. Moreover, when applied to in vivo aortic data, the SOSVD filter enhanced various flow determinants, including divergence, velocity gradients, streamlines, and velocity coherence. Thus, the SOSVD method presents a promising avenue for augmenting noise reduction in 4D flow MRI, potentially elevating diagnostic accuracy and enriching cardiovascular disease research. [ABSTRACT FROM AUTHOR]

Published
2024
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