Sarkar Vikren, Huang Long, Huang Yu-Huei Jessica, Szegedi Martin W, Rassiah-Szegedi Prema, Zhao Hui, Salter Bill J
Department of Radiation Oncology, University of Utah, Salt Lake City, UT 84112, USA.
J Radiosurg SBRT. 2016;4(3):213-223.
Multiple commercial phantoms are now available for performing end-to-end QA testing for stereotactic procedures. This project aims at directly comparing one of the newest phantoms on the market against a more established one by performing similar tests to determine whether results are similar and they can be used interchangeably. Both phantoms were used to evaluate the coincidence of radiation and laser isocenters of a linear accelerator. End-to-end dosimetric tests were also performed using both an ion chamber and film. As part of the testing, both phantoms were also evaluated in terms of their efficiency of setup as well as the time required to switch inserts for different tests. Results showed that the laser/radiation isocenter coincidence as determined from each phantom was highly correlated. Ion chamber results were within 0.5% of the expected values. Gamma (2%, 2mm) pass rates of corresponding films were within 2% between phantoms. These results show that both phantoms are capable of producing equivalent results for the QA tests evaluated here.
现在有多种商用体模可用于对立体定向程序进行端到端质量保证测试。该项目旨在通过进行类似测试，将市场上最新的一种体模与一种更成熟的体模直接进行比较，以确定结果是否相似以及它们是否可以互换使用。两种体模都用于评估直线加速器的辐射等中心与激光等中心的重合度。还使用电离室和胶片进行了端到端剂量学测试。作为测试的一部分，还从设置效率以及为不同测试更换插入物所需的时间方面对两种体模进行了评估。结果表明，每种体模确定的激光/辐射等中心重合度高度相关。电离室结果在预期值的0.5%以内。两种体模相应胶片的伽马（2%，2毫米）通过率相差在2%以内。这些结果表明，对于此处评估的质量保证测试，两种体模都能够产生等效结果。
