McGinley P H, Butker E K, Crocker I R, Landry J C
Emory Clinic, Division of Radiation Therapy, Atlanta, GA 30322.
Phys Med Biol. 1990 May;35(5):649-57. doi: 10.1088/0031-9155/35/5/005.
A new technique for stereotactic radiosurgery by use of a patient rotator is described. Using the rotator with a small collimated beam of 6 MV x-rays, a small well-defined region of the brain can be irradiated to a high dose with rapid fall off of the dose outside the target volume. Since the linear accelerator gantry does not move during therapy the possibility of a collision between the gantry and the patient or stereotactic equipment is eliminated. The system is also independent of the rotational stability of the linear accelerator gantry axis and turntable axis. Dose distributions measured in a Lucite head phantom with film exhibited properties well suited for radiotherapy. Tests carried out to evaluate the ability to irradiate a selected target point within the brain with the rotator system showed a maximum positional error of 1.0 and 2.0 mm for angiography and CT localisation respectively.
本文描述了一种使用患者旋转装置的立体定向放射外科新技术。使用该旋转装置和6兆伏X射线的小准直束，可对脑内一个小的、界限清晰的区域进行高剂量照射，且靶体积外剂量迅速下降。由于治疗过程中直线加速器机架不移动，消除了机架与患者或立体定向设备碰撞的可能性。该系统也不依赖于直线加速器机架轴和转台轴的旋转稳定性。在有机玻璃头部模型中用胶片测量的剂量分布显示出非常适合放射治疗的特性。为评估使用旋转器系统照射脑内选定靶点的能力而进行的测试表明，血管造影和CT定位时的最大位置误差分别为1.0毫米和2.0毫米。
