Mong Kam Shan, Wallace Anthony B, Franich Rick D
Austin Health; RMIT University.
J Appl Clin Med Phys. 2016 Mar 8;17(2):532-541. doi: 10.1120/jacmp.v17i2.5746.
The purpose of this study was to demonstrate asymmetric radiation dose distribution to the breasts in coronary angiography. Gafchromic XR-QA2 film was used as an area dosimeter to capture the asymmetric dose distribution to the breasts at various tissue depths in an anthropomorphic phantom. A selection of tube angulations were used under a controlled experiment and during a mock coronary angiography procedure. The Gafchromic XR-QA2 film was able to confirm the asymmetric distribution of radiation dose to the breast and provide a normalized breast dose value. The right breast received the majority of dose for most of the tube angulations in the controlled experiment. However the left breast received the most radiation dose during the mock procedure. Asymmetric dose distribution to the breasts is normally not observed if Monte Carlo based simulations are performed because individual breast dose calculations are not available. The application of a typical coronary angiogram determined in the experiment showed the normalized left breast dose is 0.16 mGy/ Gy.cm2 and the right breast dose is 0.08 mGy/ Gy.cm2.
本研究的目的是证明冠状动脉造影中乳房的不对称辐射剂量分布。使用Gafchromic XR-QA2胶片作为面积剂量计，以获取在人体模型中不同组织深度处乳房的不对称剂量分布。在对照实验和模拟冠状动脉造影过程中使用了一系列的管角度。Gafchromic XR-QA2胶片能够确认乳房辐射剂量的不对称分布，并提供归一化的乳房剂量值。在对照实验中，对于大多数管角度，右乳房接受了大部分剂量。然而，在模拟过程中左乳房接受的辐射剂量最大。如果进行基于蒙特卡洛的模拟，通常不会观察到乳房的不对称剂量分布，因为无法获得个体乳房剂量计算结果。实验中确定的典型冠状动脉造影的应用表明，归一化的左乳房剂量为0.16 mGy/ Gy.cm2，右乳房剂量为0.08 mGy/ Gy.cm2。
