Development of 3D Radiotherapy-Planning System by Means of Computer-Controlled Multi-Leaf Collimators

这项研究的目的是开发理想的靶区体积，在3D计算的肿瘤本身中具有最高的剂量，而在周围组织中具有较小的剂量。通过理论研究，以X光直线加速器口部安装的26对超越式多叶准直器为硬件，通过优化软件，在任何预定的机架角度和剂量的情况下，利用PC机对患者进行适形放射治疗，具有良好的三维靶区生成能力。因此，新开发的凹形剂量分布使照射更实际的靶体成为可能。本研究的另一种装置包括根据CT图像上的输入自动实现光束的人眼观察以获得所需的靶，并成功地实现了对准直器的完全计算机控制。

The aim of this investigation is to develop the ideal target volume, having the highest dose in the 3D calculated tumor itself but less dose in the surrounding tissues. That is conformation radiotherapy.After the theoretical study, using the 26 pairs of over-ride type multi-leaf collimators attached to the mouth of X-ray linear accelerator as a hard-ware, this conformation radio-therapy unit has a good capability to produce the 3D target volume by means of optimized soft-ware in the cases of any pre-set gantry angles and dose to the patients with a personal computer. Thus, the newly developed concave shaped dose distribution is made it possible to irradiate the more practical target volume.Another device in this investigation includes the realization of beam's eye view automatically from the input on the CT images for the desired target and the success of complete computer-control of the collimators.