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Your search keyword '"Amano, Yasuo"' showing total 387 results
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387 results on '"Amano, Yasuo"'

2. Measurement of Turbulent Kinetic Energy in Hypertrophic Cardiomyopathy Using Triple-velocity Encoding 4D Flow MR Imaging

Author

Iwata, Kotomi, primary, Sekine, Tetsuro, additional, Matsuda, Junya, additional, Tachi, Masaki, additional, Imori, Yoichi, additional, Amano, Yasuo, additional, Ando, Takahiro, additional, Obara, Makoto, additional, Crelier, Gerard, additional, Ogawa, Masashi, additional, Takano, Hitoshi, additional, and Kumita, Shinichiro, additional

Published
2024
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11. Optimization of 201Tl Dosage in a Simultaneous Acquisition Rest 99mTc/Stress 201Tl Dual-Isotope Myocardial Perfusion Single-Photon Emission Computed Tomography with Semiconductor Gamma Camera

Author

Sugai, Shonosuke, primary, Matsumoto, Naoya, additional, Makita, Ayano, additional, Kuronuma, Keiichiro, additional, Suzuki, Yasuyuki, additional, Hori, Yoshitaka, additional, Yoda, Shunichi, additional, Okumura, Yasuo, additional, and Amano, Yasuo, additional

Published
2023
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18. Localization of Late Gadolinium Enhancement and Its Association with Ventricular Tachycardia in Patients with Cardiac Sarcoidosis

Author

Yodogawa, Kenji, primary, Fukushima, Yoshimitsu, additional, Tachi, Masaki, additional, Fujimoto, Yuhi, additional, Hagiwara, Kanako, additional, Oka, Eiichiro, additional, Hayashi, Hiroshi, additional, Murata, Hiroshige, additional, Yamamoto, Teppei, additional, Iwasaki, Yu-ki, additional, Amano, Yasuo, additional, Kumita, Shin-ichiro, additional, and Shimizu, Wataru, additional

Published
2022
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19. Clinical Importance of Myocardial T2 Mapping and Texture Analysis

Author

Amano, Yasuo, Omori, Yuko, Ando, Chisato, Yanagisawa, Fumi, Suzuki, Yasuyuki, Tang, Xiaoyan, Kobayashi, Hiroko, Takagi, Ryo, and Matsumoto, Naoya

Subjects
Adult, Aged, 80 and over, Male, Edema, Cardiac, Myocardium, Contrast Media, Magnetic Resonance Imaging, Cine, Gadolinium, Review, Middle Aged, Fibrosis, Severity of Illness Index, T2 mapping, Predictive Value of Tests, cardiac MRI, T2-weighted imaging, Humans, Female, Diagnosis, Computer-Assisted, texture analysis, Aged
Abstract

Late gadolinium enhancement (LGE) magnetic resonance imaging (MRI) is valuable for diagnosis and assessment of the severity of various myocardial diseases owing to its potential to visualize myocardial scars. T1 mapping is complementary to LGE because it can quantify the degree of myocardial fibrosis or edema. As such, T1-weighted imaging techniques, including LGE using an inversion recovery sequence, contribute to cardiac MRI. T2-weighted imaging is widely used to characterize the tissue of many organs. T2-weighted imaging is used in cardiac MRI to identify myocardial edema related to chest pain, acute myocardial diseases, or severe myocardial injuries. However, it is difficult to determine the presence and extent of myocardial edema because of the low contrast between normal and diseased myocardium and image artifacts of T2-weighted images and the lack of an established method to quantify the images. T2 mapping quantifies myocardial T2 values and help identify myocardial edema. The T2 values are significantly related to the clinical symptoms or severity of nonischemic cardiomyopathy. Texture analysis is a postprocessing method to quantify tissue alterations that are reflected in the T2-weighted images. Texture analysis provides a variety of parameters, such as skewness, entropy, and grey-scale non-uniformity, without the need for additional sequences. The abnormal signal intensity on T2-weighted images or T2 values may correspond to not only myocardial edema but also other tissue alterations. In this review, the techniques of cardiac T2 mapping and texture analysis and their clinical relevance are described.

Published
2020

20. Relationship between Measurement Errors in Myocardial T1 Mapping and Heart Rate

Author

Amano, Yasuo, Omori, Yuko, Yanagisawa, Fumi, Ando, Chisato, Shinoda, Naoki, Suzuki, Yasuyuki, Yamamoto, Hiroshi, and Matsumoto, Naoya

Subjects
native T1 mapping, Adult, Male, Myocardium, Reproducibility of Results, Heart, Stroke Volume, Middle Aged, Magnetic Resonance Imaging, Ventricular Function, Left, Heart Rate, Predictive Value of Tests, Bradycardia, Heart Septum, Image Processing, Computer-Assisted, Humans, Diagnostic Errors, hear rate, Major Paper, measurement error, modified Look-Locker inversion recovery (MOLLI)
Abstract

Purpose: Modified Look-Locker inversion recovery (MOLLI) using a 5s(3s)3s scheme is robust to tachycardia, but some errors are occasionally observed in myocardial T1 mapping. We sought to evaluate the relationship between measurement errors in T1 mapping and heart rate (HR) using a confidence map. Methods: We enrolled 69 male patients with normal native T1 values of the septal myocardium measured by a 5s(3s)3s MOLLI. The degree of measurement errors in the septal myocardium was assessed by two independent observers on a confidence map using a 4-point scale: 0, no errors; 1, errors located on the myocardial contour; 2, errors extended into the myocardial contour; and 3, errors extended into the midwall. We compared the scores of measurement errors and the average, maximum, minimum or variability of the HR indicated during the MOLLI scan (iHR), image phases of MOLLI or left ventricular ejection fraction (LVEF). Results: Patients with score >1 for the septal myocardium had significantly lower minimum iHR than those with a score ≤1 (P < 0.01; 49.8 ± 10.1 vs. 59.6 ± 9.7 beat per min). Conclusion: The confidence map shows more measurement errors in patients with lower minimum iHR. The myocardial T1 values should be measured carefully in patients with bradycardia during MOLLI scanning.

Published
2020

31. Cross-Comparison of 4-Dimensional Flow Magnetic Resonance Imaging and Intraoperative Middle Cerebral Artery Pressure Measurements Before and After Superficial Temporal Artery-Middle Cerebral Artery Bypass Surgery

Author

Sekine, Tetsuro, primary, Murai, Yasuo, additional, Orita, Erika, additional, Ando, Takahiro, additional, Takagi, Ryo, additional, Amano, Yasuo, additional, Matano, Fumihiro, additional, Iwata, Kotomi, additional, Ogawa, Masashi, additional, Obara, Makoto, additional, and Kumita, Shinichiro, additional

Published
2021
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37. Incremental Predictive Value of Coronary Calcium Score in Risk Stratification of Coronary Revascularization in Patients With Normal or Mild Ischemia Using Nuclear Myocardial Perfusion Single Photon Emission Computed Tomography

Author

Suzuki, Yasuyuki, primary, Matsumoto, Naoya, additional, Nagumo, Sakura, additional, Matsuo, Rei, additional, Kuronuma, Keiichiro, additional, Ashida, Tadashi, additional, Tani, Shigemasa, additional, Yoda, Shunichi, additional, Amano, Yasuo, additional, and Okumura, Yasuo, additional

Published
2021
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