Stuecklschweiger G F, Feichtinger K
Universitätsklinik für Radiologie, Klinische Abteilung für Strahlentherapie, Graz, Austria.
Strahlenther Onkol. 1998 Oct;174 Suppl 2:43-6.
Because of the large single-fraction dose in stereotactic radiosurgery it is important to guarantee a high geometric and dosimetric accuracy. The paper represent the quality assurance program for the Gamma Knife unit at the University Clinic of Neurosurgery in Graz. The program includes the following procedures: timer control, mechanical radiation isocenter coincidence, trunnion centricity, helmet microswitches test, radiation output and relative helmet factors, dose profile verification, safety interlocks checks and software quality assurance. In summary, the mechanical accuracy and reproducibility of the Gamma Knife unit are < 1 mm. The geometric failure in stereotactic Gamma Knife treatment is limited by the human error in setting the clinical target volume and the spatial accuracy of dose delivery to the patient is limited by the accuracy of modern target localization procedures.
由于立体定向放射外科单次大剂量照射，保证高几何精度和剂量精度很重要。本文介绍了格拉茨大学神经外科诊所伽玛刀设备的质量保证计划。该计划包括以下程序：定时器控制、机械辐射等中心重合、耳轴同心度、头盔微动开关测试、辐射输出和相对头盔因子、剂量分布验证、安全联锁检查和软件质量保证。总之，伽玛刀设备的机械精度和可重复性小于1毫米。立体定向伽玛刀治疗中的几何误差受临床靶体积设置中的人为误差限制，而向患者进行剂量递送的空间精度受现代靶区定位程序精度的限制。
