多施設における循環器撮影装置のIVR基準点での線量率の比較

摘要

The management of the radiation dose is very important in interventional radiology (IVR), especially in percutaneous coronary intervention (PCI). Therefore, we measured entrance surface doses at the interventional reference point of 27 cardiac intervention procedures in 22 cardiac catheterization laboratories around Hiroshima, and compared these doses. Recently, for cardiac interventional radiology, the X-ray machines using flat-panel detectors (FPD) instead of image intensifiers (I.I.) is increasing; 13 systems used FPD and 14 systems used I.I. For fluoroscopy rate, the difference between laboratories was 9 times. For cineangiography rate, the difference between laboratories was 7 times. In addition, between both devices, the I.I. group is bigger than the FPD group. When comparing by the same condition, for the dose at the interventional reference point, no significant difference was detected between the FPD group and the I.I. group. This study shows that FPD is not available for reducing the radiation dose simply. Therefore, it is necessary that we think of the balance with image quality and radiation dose. The optimization of the devices and cardiac intervention procedures becomes very important.%アンケート調査および同一の線量計，ファントムを用rnい多施設の基準線量測定を行った結果，循環器撮影装rn置の施設間格差の現状が把握できた．また，FPD群とrnI．I．群の基準線量は透視，撮影ともに有意な差は認められなかった．基準線量を測定しFPD装置の特徴を有効rnに活用し，最適な線量管理を行うことが被ばく低減にrn繋がるものと考えられる．