基于双管压 CT 图像获取带电粒子相对阻止本领的 方法研究
Study on the method of acquiring the relative stopping power of charged particles based on dualtube voltage CT images
Abstract: In proton and heavy ion radiotherapy, the relative stopping power of each voxel point obtained by CT scan for patient is the key to accurately calculate the dose distribution in the body using treatment planning system. In this study, a tissue equivalent phantom was scanned twice by setting different tube voltages for a conventional CT scanner. The relative electron density and effective atomic number of the phantom were calculated by the CT values derived from the two-set images, and then the relative stopping power of the phantom was calculated. The results showed that the relative stopping power of the tissue equivalent phantom acquired with the two-set CT values was better than that based on the conventional single set of CT images. Thus, the method established in this study might play an important role in further improving the dose calculation accuracy in the treatment planning of proton and heavy ion radiotherapy.