Yasumatsu Shogo, Tanaka Nobukazu, Iwase Kensuke, Shimizu Yoichiro, Morishita Junji
Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
Department of Radiological Science, Faculty of Health Sciences, Junshin Gakuen University, 1-1-1 Chikushigaoka, Minami-ku, Fukuoka, 815-8510, Japan.
Radiol Phys Technol. 2016 Jan;9(1):109-15. doi: 10.1007/s12194-015-0340-3. Epub 2015 Nov 30.
We investigated the effect of X-ray beam qualities RQA3, 5, 7, and 9 on the exposure index (EI) as defined by International Electrotechnical Commission guideline 62494-1. Half-value layers (HVLs) of RQA5 X-rays passing through anti-scatter grids (grid ratios 6:1, 8:1, 10:1, and 12:1) were also evaluated because grids are frequently used in clinical situations. The maximum percent differences in the EIs for RQA3, 7, and 9 with respect to RQA5 were 35.0, 11.6, and 38.7 %, respectively. The range of HVLs for RQA5-7 beams was 7.10-9.10 mm of aluminum (mm Al). This was wider than the range of HVLs when grids were used (6.94-7.29 mm Al). The effect of variations in X-ray beam qualities in the RQA series on the EI was significantly greater than the effect of grids. This study indicated that, in clinical settings, the EI should be used carefully in X-ray examinations with different X-ray beam qualities.
我们根据国际电工委员会第62494-1号指南，研究了X射线束质RQA3、5、7和9对曝光指数（EI）的影响。由于在临床情况下经常使用滤线栅，因此还评估了RQA5 X射线通过滤线栅（栅比为6:1、8:1、10:1和12:1）时的半值层（HVL）。RQA3、7和9相对于RQA5的EI的最大百分比差异分别为35.0%、11.6%和38.7%。RQA5-7射线束的HVL范围为7.10-9.10毫米铝（mm Al）。这比使用滤线栅时的HVL范围（6.94-7.29毫米铝）更宽。RQA系列中X射线束质变化对EI的影响明显大于滤线栅的影响。本研究表明，在临床环境中，在不同X射线束质的X射线检查中应谨慎使用EI。
