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31 results on '"Haga, Yoshihiro"'

15. Computed Tomography Score of Aortic Valve Tissue May Predict Cerebral Embolism During Transcatheter Aortic Valve Implantation

Author

Tada, Norio, primary, Haga, Yoshihiro, additional, Suzuki, Shinichi, additional, Enta, Yusuke, additional, Miyasaka, Masaki, additional, Inoue, Hiroshi, additional, Taguri, Masataka, additional, Ishii, Kiyoshi, additional, Hata, Masaki, additional, Sakuma, Masashi, additional, Toyoda, Shigeru, additional, Inoue, Teruo, additional, and Ootomo, Tatsushi, additional

Published
2017
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30. [Examination of Dosage Optimization Based on Body Weight Index in Resting Myocardial Blood Flow Scintigraphy Using 99m Tc].

Author

Tanaka S, Abe M, Haga Y, and Kaga Y

Subjects
Humans, Radionuclide Imaging, Body Weight, Technetium, Radiopharmaceuticals, Tomography, Emission-Computed, Single-Photon methods
Abstract

Purpose: The purpose of this study was to optimize radiopharmaceutical dosage in single-photon emission computed tomography (SPECT) nuclear medicine. Therefore, we examined a variable dose (VD) method using body weight as an index in resting myocardial scintigraphy using a 99m Technetium ( 99m Tc) preparation., Methods: In this study, we compared the VD method with the fixed dose (FD) method without a variable by body weight. There were 50 patients using the VD method and 50 patients using the FD method. For the VD method, we set the target average count (counts/pixel) per SPECT view. Using the myocardial average count of the FD method, and the estimated intracorporeal radioactivity at the start of the examination, the dose of the VD method, which varies appropriately depending on the body weight, was calculated., Results: The VD method had less variation in myocardial counting and was closer to the target count than the FD method, and the median dosage decreased., Conclusion: The VD method suggested the possibility of obtaining a count independent of physique and stable image quality, reducing medical and occupational radiation exposure in resting myocardial blood flow scintigraphy.

Published
2024
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31. Occupational dose in interventional radiology procedures.

Author

Chida K, Kaga Y, Haga Y, Kataoka N, Kumasaka E, Meguro T, and Zuguchi M

Subjects
Cardiac Catheterization, Cineangiography, Coronary Angiography, Film Dosimetry, Humans, Nursing Staff, Hospital, Occupational Diseases prevention & control, Percutaneous Coronary Intervention, Physicians, Radiation Injuries prevention & control, Radiation Protection, Occupational Exposure, Radiation Dosage, Radiology, Interventional
Abstract

Objective: Interventional radiology tends to involve long procedures (i.e., long fluoroscopic times). Therefore, radiation protection for interventional radiology staff is an important issue. This study describes the occupational radiation dose for interventional radiology staff, especially nurses, to clarify the present annual dose level for interventional radiology nurses., Materials and Methods: We compared the annual occupational dose (effective dose and dose equivalent) among interventional radiology staff in a hospital where 6606 catheterization procedures are performed annually. The annual occupational doses of 18 physicians, seven nurses, and eight radiologic technologists were recorded using two monitoring badges, one worn over and one under their lead aprons., Results: The annual mean ± SD effective dose (range) to the physicians, nurses, and radiologic technologists using two badges was 3.00 ± 1.50 (0.84-6.17), 1.34 ± 0.55 (0.70-2.20), and 0.60 ± 0.48 (0.02-1.43) mSv/y, respectively. Similarly, the annual mean ± SD dose equivalent range was 19.84 ± 12.45 (7.0-48.5), 4.73 ± 0.72 (3.9-6.2), and 1.30 ± 1.00 (0.2-2.7) mSv/y, respectively. The mean ± SD effective dose for the physicians was 1.02 ± 0.74 and 3.00 ± 1.50 mSv/y for the one- and two-badge methods, respectively (p < 0.001). Similarly, the mean ± SD effective dose for the nurses (p = 0.186) and radiologic technologists (p = 0.726) tended to be lower using the one-badge method., Conclusion: The annual occupational dose for interventional radiology staff was in the order physicians > nurses > radiologic technologists. The occupational dose determined using one badge under the apron was far lower than the dose obtained with two badges in both physicians and nonphysicians. To evaluate the occupational dose correctly, we recommend use of two monitoring badges to evaluate interventional radiology nurses as well as physicians.

Published
2013
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