2 0 0 0 腹部血管造影検査におけるX線防護衣の遮へい評価
- 著者
- 越田 吉郎 曽田 卓実 能登 公也 福田 篤志 松原 孝祐 中川 浩人 川端 千香子
- 出版者
- 公益社団法人 日本放射線技術学会
- 雑誌
- 日放技学誌 (ISSN:03694305)
- 巻号頁・発行日
- vol.61, no.7, pp.989-996, 2005
- 参考文献数
- 20
- 被引用文献数
- 1 4
Medical personnel involved in abdominal angiography are exposed not only to direct radiation but also scattered radiation from inspection tables, patients, image intensifiers, and the beam-limiting system (collimator), among others. Japanese standard JISZ4831 prescribes protective coats of at least 0.25mm lead equivalent, which is the uniform thickness of lead equivalent. The most commonly used protective coats are 0.25mm Pb, 0.35mm Pb, or 0.5mm Pb in thickness. The weight of a typical protective coat is about 3kg. While some coats weigh up to 6kg, wearing such heavy coats becomes physically burdensome as inspection time increases. The trade-off between physical burden and protection was considered by analyzing the X-ray intensity distribution and attenuation rate of scattered radiation in each position assumed by the medical staff. In the case of inspections performed at an x-ray tube voltage of 80kV, it may be possible to reduce the weight of the lead rubber apron by about 33%. Namely, the lead thickness can be reduced uniformly by 0.20mm Pb at 70cm and 0.05mm Pb at 100cm, when the shielding capability of a 0.25mm thick Pb layer is accepted as the standard at 40cm above the gonad position. The same range of permeated X-ray dose for the gonad position may be reduced as well. In the case of 110kV, when the lead thicknesses are 0.30mm Pb at 40cm and 70cm, and 0.10mm Pb at 100cm, it is possible to reduce the weight of the lead rubber apron by about 28%.
2 0 0 0 OA 腹部血管造影検査におけるX線防護衣の遮へい評価
- 著者
- 越田 吉郎 曽田 卓実 能登 公也 福田 篤志 松原 孝祐 中川 浩人 川端 千香子
- 出版者
- 公益社団法人日本放射線技術学会
- 雑誌
- 日本放射線技術學會雜誌 (ISSN:03694305)
- 巻号頁・発行日
- vol.61, no.7, pp.989-996, 2005-07-20
- 被引用文献数
- 1
Medical personnel involved in abdominal angiography are exposed not only to direct radiation but also scattered radiation from inspection tables, patients, image intensifiers, and the beam-limiting system (collimator), among others. Japanese standard JISZ4831 prescribes protective coats of at least 0.25mm lead equivalent, which is the uniform thickness of lead equivalent. The most commonly used protective coats are 0.25mm Pb, 0.35mm Pb, or 0.5mm Pb in thickness. The weight of a typical protective coat is about 3kg. While some coats weigh up to 6kg, wearing such heavy coats becomes physically burdensome as inspection time increases. The trade-off between physical burden and protection was considered by analyzing the X-ray intensity distribution and attenuation rate of scattered radiation in each position assumed by the medical staff. In the case of inspections performed at an x-ray tube voltage of 80kV, it may be possible to reduce the weight of the lead rubber apron by about 33%. Namely, the lead thickness can be reduced uniformly by 0.20mm Pb at 70cm and 0.05mm Pb at 100cm, when the shielding capability of a 0.25mm thick Pb layer is accepted as the standard at 40cm above the gonad position. The same range of permeated X-ray dose for the gonad position may be reduced as well. In the case of 110kV, when the lead thicknesses are 0.30mm Pb at 40cm and 70cm, and 0.10mm Pb at 100cm, it is possible to reduce the weight of the lead rubber apron by about 28%.
1 0 0 0 OA CT-AEC を用いた低管電圧撮影の被ばくに関する検討
- 著者
- 髙田 光雄 松原 孝祐 越田 吉郎 太郎田 融
- 出版者
- 公益社団法人 日本放射線技術学会
- 雑誌
- 日本放射線技術学会雑誌 (ISSN:03694305)
- 巻号頁・発行日
- vol.71, no.4, pp.332-337, 2015 (Released:2015-04-20)
- 参考文献数
- 14
- 被引用文献数
- 2 5
The purpose of our study was to investigate radiation dose for lower tube voltage CT using automatic exposure control (AEC). An acrylic body phantom was used, and volume CT dose indices (CTDIvol) for tube voltages of 80, 100, 120, and 135 kV were investigated with combination of AEC. Average absorbed dose in the abdomen for 100 and 120 kV were also measured using thermoluminescence dosimeters. In addition, we examined noise characteristics under the same absorbed doses. As a result, the exposure dose was not decreased even when the tube voltage was lowered, and the organ absorbed dose value became approximately 30% high. And the noise was increased under the radiographic condition to be an equal absorbed dose. Therefore, radiation dose increases when AEC is used for lower tube voltage CT under the same standard deviation (SD) setting with 120 kV, and the optimization of SD setting is crucial.
