Hasegawa Ryota, Noguchi Kazuki, Takeda Kazuya, Sakiyama Koushi, Sato Masakazu, Maekawa Kazuki, Hayashi Toshihiro, Tajima Osamu, Sakamoto Hajime, Sato Hisaya, Ishikawa Eiji
Department of Radiology, Chiba Emergency and Psychiatric Medical Center.
Department of Radiology, Chiba Children's Hospital.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2024 Oct 20;80(10):1046-1055. doi: 10.6009/jjrt.2024-1483. Epub 2024 Sep 12.
In DRLs 2020, the entrance surface air kerma (Ka,e) was set to 17 mGy/min as the reference dose rate in fluoroscopy. But, Ka,e in fluoroscopy for different regions and Ka,e in exposure was not set. A multicenter survey was conducted to evaluate Ka,e by each area.
Ka,e for each area was analyzed for 79 facilities attending this survey (274 machines and 461 protocols). When the protocols were changed by the difference in disease, angiography, or IVR, the difference rate of Ka,e was evaluated. Ka,e before and after modifying the incident air kerma at the patient entrance reference point (Ka,r) and air kerma area product (P) difference rate were calculated when protocols were changed, considering the DRLs 2020.
There were dose differences in Ka,e by each area. Compared to DRLs 2020, 36 protocols from 13 facilities modified their protocols, all of which reduced Ka,e.
Although reducing Ka,e does not necessarily reduce Ka,r, and P, comparison of Ka,e by each area is expected to optimize medical exposure protection, including evaluation of quality control.
在2020年的剂量率参考水平（DRLs）中，荧光透视时的体表空气比释动能（Ka,e）设定为17 mGy/min作为参考剂量率。但是，未设定不同区域荧光透视时的Ka,e以及照射时的Ka,e。进行了一项多中心调查，以评估各区域的Ka,e。
对参与本次调查的79家机构（274台设备和461个检查方案）的各区域Ka,e进行分析。当检查方案因疾病、血管造影或介入放射学的差异而改变时，评估Ka,e的差异率。在考虑2020年DRLs的情况下，当检查方案改变时，计算患者入口参考点处的入射空气比释动能（Ka,r）和空气比释动能面积乘积（P）差异率改变前后的Ka,e。
各区域的Ka,e存在剂量差异。与2020年DRLs相比，13家机构的36个检查方案修改了其方案，所有这些方案都降低了Ka,e。
虽然降低Ka,e不一定会降低Ka,r和P，但预计各区域Ka,e的比较有助于优化医疗照射防护，包括质量控制评估。
