Department of Radiological Technology, School of Health Sciences, Faculty of Medicine, Tohoku University, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
AJR Am J Roentgenol. 2009 Dec;193(6):1680-5. doi: 10.2214/AJR.09.2747.
Currently, cardiac interventional radiology equipment has tended toward using flat-panel detectors (FPDs) instead of image intensifiers (IIs) because FPDs offer better imaging performance. However, the radiation dose from an FPD in cardiac interventional radiology is not clear. The purpose of our study was to measure the radiation doses during cineangiography and fluoroscopy of many cardiac radiology systems that use FPDs or IIs, in clinical settings.
This study examined 20 radiology systems in 15 cardiac catheterization laboratories (11 used FPD and nine used II). The entrance surface doses with digital cineangiography and fluoroscopy were compared for the 20 systems using acrylic plates (20-cm thick) and a skin dose monitor.
For fluoroscopy, the average entrance surface doses of the 20-cm-thick acrylic plates were identical for FPD (average +/- SD, 16.63 +/- 7.89 mGy/min; range, 5.7-26.4 mGy/min; maximum/minimum, 4.63) and II (17.81 +/- 12.52 mGy/min; range, 6.5-42.2 mGy/min; maximum/minimum, 6.49) (p = 0.799). For digital cineangiography, the average entrance surface dose of the 20-cm-thick acrylic plate was slightly lower with FPD (29.68 +/- 16.40 mGy/10 s; range, 8.9-58.5 mGy/10 s; maximum/minimum, 6.57) than with II (38.50 +/- 33.71 mGy/10 s; range, 15.2-117.1 mGy/10 s; maximum/minimum, 7.70), although the difference was not significant (p = 0.487).
We found that the average entrance doses of cineangiography and fluoroscopy in FPD systems were not significantly different from those in II systems. Hence, FPDs did not inherently reduce the radiation dose, although FPDs possess good detective quantum efficiency. Therefore, to reduce the radiation dose of cardiac interventional radiology systems, even FPD systems, practical measures are necessary.
目前，心脏介入放射学设备已倾向于使用平板探测器（FPD）代替影像增强器（II），因为 FPD 提供更好的成像性能。然而，心脏介入放射学中 FPD 的辐射剂量尚不清楚。我们的研究目的是在临床环境中测量使用 FPD 或 II 的许多心脏放射学系统的电影血管造影和透视时的辐射剂量。
本研究检查了 15 个心脏导管实验室中的 20 个放射学系统（11 个使用 FPD，9 个使用 II）。使用丙烯酸板（20cm 厚）和皮肤剂量监测器比较了 20 个系统的数字电影血管造影和透视的入口表面剂量。
对于透视，20cm 厚丙烯酸板的 FPD（平均 +/- SD，16.63 +/- 7.89 mGy/min；范围，5.7-26.4 mGy/min；最大/最小，4.63）和 II（17.81 +/- 12.52 mGy/min；范围，6.5-42.2 mGy/min；最大/最小，6.49）的入口表面剂量平均值相同（p = 0.799）。对于数字电影血管造影，20cm 厚丙烯酸板的 FPD 平均入口表面剂量略低（29.68 +/- 16.40 mGy/10s；范围，8.9-58.5 mGy/10s；最大/最小，6.57）比 II（38.50 +/- 33.71 mGy/10s；范围，15.2-117.1 mGy/10s；最大/最小，7.70），尽管差异不显著（p = 0.487）。
我们发现 FPD 系统的电影血管造影和透视的平均入口剂量与 II 系统没有显著差异。因此，尽管 FPD 具有良好的探测量子效率，但 FPD 并没有固有地降低辐射剂量。因此，为了降低心脏介入放射学系统的辐射剂量，即使是 FPD 系统，也需要采取实际措施。
