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Hamada, Nobuyuki*; Imaoka, Tatsuhiko*; Masunaga, Shinichiro*; Ogata, Toshiyuki*; Okayasu, Ryuichi*; Takahashi, Akihisa*; Kato, Takamitsu*; Kobayashi, Yasuhiko; Onishi, Takeo*; Ono, Koji*; et al.
Journal of Radiation Research, 51(4), p.365 - 383, 2010/07
Times Cited Count：115 Percentile：91.16(Biology)Akahane, Keiichi*; Ono, Koji*; Okuda, Yasuo*; Sato, Kaoru; Takahashi, Fumiaki; Ban, Nobuhiko*; Shimada, Yoshiya*; Endo, Akira; Kai, Michiaki*
no journal, ,
The WAZA-ARI is a dose calculator of medical exposures on X-ray CT examinations, which is the web-based program based on the simulation data of voxel phantoms of Japanese adults and a 4-y girl. After the development, the WAZA-ARI has been installed in a web server of National Institute of Radiological Sciences (NIRS), and opened to the public as trial uses on Dec 2012. The user authentication function and the data input pages by users have been adding to the WAZA-ARI to store the calculated data and the inputted data of doses and frequencies of X-ray CT examinations into the database on medical exposure in NIRS for the analyses of the CT exposures. The use of these functions and WAZA-ARI II, which can calculate the doses of different patients' body sizes, will provide the basic and useful data on the CT exposures for the radiation protection in medicine, because the portion of CT doses in the overall medical exposures are relatively high compared to other radiological diagnoses.
Koba, Yusuke*; Nakada, Yoshihiro*; Matsumoto, Shinnosuke*; Akahane, Keiichi*; Ono, Koji*; Sato, Kaoru; Takahashi, Fumiaki; Endo, Akira; Shimada, Yoshiya*; Kai, Michiaki*
no journal, ,
While CT scan is useful for diagnosis, exposure dose derived from CT scan is relatively high. Therefore, it is important to manage patient doses and to prevent the excess exposures in young patients. JAEA developed the CT dose calculator, WAZA-ARIv2 under the collaboration research project with the National Institute of Radiological Sciences and the Oita University of Nursing and Health Sciences. In WAZA-ARIv2, users can accurately calculate exposure doses through the browser under consideration of patients information about sexes, ages (0y, 1y, 5y, 10y, 15y and adult) and fatness (small, large and extra-large body sizes). The functions of registration and database compilation of CT scan conditions and patient doses are newly added to a WAZA-ARIv2. Users can compare the distribution of patient doses in Japan with those in user's medical institution. Therefore, it will be expected that WAZA-ARIv2 can contribute the management and optimization of patients doses due to CT scan.
Koba, Yusuke*; Matsumoto, Shinnosuke*; Nakada, Yoshihiro*; Kasahara, Tetsuji*; Akahane, Keiichi*; Okuda, Yasuo*; Sato, Kaoru; Takahashi, Fumiaki; Yoshitake, Takayasu*; Hasegawa, Takayuki*; et al.
no journal, ,
Many of the CT devices are in Japan. It is guessed that exposure doses of Japanese derived from CT scans are higher than others. Thus, it is needed to properly manage scan conditions and exposure doses of individual patients. JAEA developed WAZA-ARI under the collaboration research project with the National Institute of Radiological Sciences (NIRS) and the Oita University of Nursing and Health Sciences. Practical use of new version WAZA-ARI named WAZA-ARIv2 began on January 30, 2015 at the web server in NIRS. In WAZA-ARIv2, users can calculate patients doses by using only standard condition (120 kV) of X-tube voltage. In recent years, CT scans at low tube voltage against pediatric patients with high radiosensitivity are increasing. In this study, spectrum of X-ray derived from CT scan at low tube voltage was examined, and was defined in "usrsors.f" file of PHITS. We reported the characteristics of X-ray and organ doses derived from CT scan at low tube voltage (80 kV).
Ono, Koji*; Koba, Yusuke*; Matsumoto, Shinnosuke*; Nakada, Yoshihiro*; Okuda, Yasuo*; Akahane, Keiichi*; Sato, Kaoru; Takahashi, Fumiaki; Yoshitake, Takayasu*; Hasegawa, Takayuki*; et al.
no journal, ,
In medical treatment, CT scan is useful diagnostic method. On the other hand, exposure doses derived from CT scans are dependent on body sizes of patients. Therefore, consideration of body sizes is essential for accurate dose assessment of individual patients. JAEA developed the CT dose calculator, WAZA-ARIv2 under the collaboration research project with the National Institute of Radiological Sciences and the Oita University of Nursing and Health Sciences. WAZA-ARIv2 enable users to accurately calculate exposure doses of patients with sexes, ages (0y, 1y, 5y, 10y, 15y and adult) and fatness (small, large and extra-large body sizes). In the future, we will be plans to add the dose calculation functions corresponding to the scan conditions at low tube voltage and multi-detector row (more 80) CT devices to WAZA-ARIv2. We reported the system and future plans of WAZA-ARIv2 corresponding to dose calculation of patients with various body sizes.
