旋转造影与标准造影术患者辐射剂量比较

目的 比较双轴旋转造影（RA）与传统标准造影（SA）时患者所受辐射剂量。方法 采用同一拟人模体模拟临床条件下的冠状动脉造影。根据不同造影模式，实验分为RA组和SA组，根据不同电影时间，SA组又分为2 s组（SA1）、3 s组（SA2）、5 s组（SA3）3个亚组。造影操作使用机器预设程序自动调节造影体位并控制透视及造影时间，每组均使用同一模体重复操作10次完整造影，采用TLD 3×3矩阵和造影机随机配备的射线剂量仪同时记录辐射剂量，后者可记录剂量面积乘积（DAP）和空气比释动能（AK），每组数据重复测量10次取均值进行比较。结果 完成整个造影操作，RA组累计DAP、AK均值分别为3 061.6 mGy·cm²和64.2 mGy，低于SA1组（4 213.9 mGy·cm²和85.5 mGy）、SA2组（6 436.0 mGy·cm²和112.2 mGy）、SA3组（12 810.4 mGy·cm²和243.7 mGy）。RA组累计皮肤入射剂量的均值（37.70 mGy）高于SA1组（26.56 mGy），但低于SA2组（46.86 mGy）、SA3组（77.79 mGy）。SA中3个亚组TLD剂量最大点与剂量最小点差异十分显著，而RA组剂量分布相对平均。结论 双轴旋转造影与传统标准造影相比，患者的累计辐射剂量显著降低，在一定程度上避免了皮肤损伤。

Comparison of radiation doses between rotational angiography and standard angiography

Objective To compare radiation doses to patients between rotational angiography and standard angiography.Methods According to different modes, our experiment was divided into RA (Dual-axis Rotational Angiography) group and SA (Standard Angiography)group. The latter was divided into 3 subgroups (SA1, SA2 and SA3) in terms of different time of cine. The procedure time and the position were controlled by the order preset into the machine. Each group consisted of 10 repeated operations with a unique phantom to simulate the true patients. The radiation doses were measured by using dose meter provided by the machine and TLD system; the means of the data were compared. Results The mean of total accumulated DAP and AK in group RA were 3 061.6 mGy·cm² and 64.2 mGy, respectively, compared with group SA1 (4 213.9 mGy·cm² and 85.5 mGy), SA2 (6 436.0 mGy·cm² and 112.2 mGy), SA3 (12 810.4 mGy·cm² and 243.7 mGy). The mean of accumulated dose in group RA was 37.70 mGy, higher than group SA1 (26.56 mGy) but lower than group SA2 (46.86 mGy) and SA3 (77.79 mGy). The gap between highest dose and lowest dose in RA group was insignificant whereas significant in the subgroups of SA. Conclusions In comparison with conventional angiography, the dual-axis rotational angiography has the potential to reduce radiation exposure of patients significantly so as to prevent skin radiation injures.