Trianni A, Bernardi G, Padovani R
Medical Physics Department, S. Maria della Misericordia Hospital, Piazzale S. Maria della Misericordia, 11, 33100 Udine, Italy.
Radiat Prot Dosimetry. 2005;117(1-3):97-101. doi: 10.1093/rpd/nci747. Epub 2006 Feb 3.
Dynamic digital flat-panel (FD) imaging technology is characterised by a higher sensitivity and image quality compared to image intensifier (II) technology. In this study, an angiography system based on II and one based on FD were compared with respect to system performance and impact of patient dose in interventional cardiology. When entrance surface air kerma rates are measured, the FD system requires a reduced dose rate, of up to 40%. For coronary angiography (CA), fluoroscopy time (FT) and dose-area product (DAP) were 4.3 +/- 5.0 min and 31.2 +/- 30.2 Gy cm2 on the II system and 4.4 +/- 3.8 min and 33.4 +/- 19.2 Gy cm2 with the FD system. For percutaneous transluminal coronary angiography, FT and DAP were 11.4 +/- 10.7 min and 52.1 +/- 45.0 Gy cm2 on II and 10.7 +/- 8.7 min and 66.9 +/- 54.4 Gy cm2 on DF. Data comparison suggests that reduced entrance dose rates do not automatically imply a reduction of patient dose in clinical practice.
动态数字平板（FD）成像技术的特点是与影像增强器（II）技术相比具有更高的灵敏度和图像质量。在本研究中，对基于II的血管造影系统和基于FD的血管造影系统在介入心脏病学中的系统性能和患者剂量影响方面进行了比较。在测量入射表面空气比释动能率时，FD系统所需的剂量率可降低高达40%。对于冠状动脉造影（CA），II系统的透视时间（FT）和剂量面积乘积（DAP）分别为4.3±5.0分钟和31.2±30.2 Gy cm²，FD系统的分别为4.4±3.8分钟和33.4±19.2 Gy cm²。对于经皮腔内冠状动脉血管成形术，II系统的FT和DAP分别为11.4±10.7分钟和52.1±45.0 Gy cm²，DF系统的分别为10.7±8.7分钟和66.9±54.4 Gy cm²。数据比较表明，在临床实践中，降低的入射剂量率并不一定意味着患者剂量的减少。
