Evaluation of Effective Dose During Abdominal Three-Dimensional Imaging for Three Flat-Panel-Detector Angiography Systems |
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Authors: | Shigeru Suzuki Ichiro Yamaguchi Takashi Kidouchi Asako Yamamoto Tomohiko Masumoto Yutaka Ozaki |
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Institution: | (1) Department of Radiology, Saitama Red Cross Hospital, 8-3-33 Kamiochiai, Chuo-ku Saitama, 338-8553, Japan;(2) Department of Radiology, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku Tokyo, 173-8605, Japan;(3) Department of Environmental Health, National Institute of Public Health, 2-3-6 Minami, Wako-shi Saitama, 351-0197, Japan;(4) Department of Radiology, Tsukuba University Hospital, 1-1-1 Tennodai, Tsukuba-shi Ibaraki, 305-8577, Japan;(5) Department of Radiology, Juntendo University Nerima Hospital, 3-1-10 Takanodai, Nerima-ku Tokyo, 177-8521, Japan |
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Abstract: | The purpose of this study was to evaluate the effective dose during abdominal three-dimensional (3D) imaging on phantoms and
estimate the dose-area product (DAP) for effective dose conversion factors for three types of angiographic units. Three-dimensional
imaging was performed for three sizes (small, medium, large) of human-shaped phantoms using three types of angiographic units
(Allura Xper FD20/10, INNOVA 4100, AXIOM Artis dTA). We calculated 25 organ doses and effective doses using Monte Carlo technique
for the three phantoms with a program for a personal computer. As benchmark studies to back up the results by Monte Carlo
technique, we measured the organ doses directly on the small phantom using radiophotoluminescent glass dosimeters. The DAP
value increased as the phantom size increased. The organ doses and the effective doses during the 3D imaging increased as
the phantom size increased. The effective doses for the small phantom by Monte Carlo technique were 1.9, 2.2, and 2.1 mSv
for the Allura Xper FD20/10, INNOVA 4100, and AXIOM Artis dTA, respectively, while those by direct measurement were 1.6, 2.0,
and 2.6 mSv. The effective doses to DAP ratios by Monte Carlo technique were 0.37–0.45, 0.26–0.32, and 0.13–0.15 (mSv Gy−1 cm−2) for the Allura Xper FD20/10, INNOVA 4100, and AXIOM Artis dTA, respectively. In conclusion, the effective doses during 3D
imaging and the dose-to-DAP ratios differ among angiographic units, and the effective dose can be estimated using a proper
conversion factor for each angiographic unit. |
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