CAJ | 학술논문

目的：探讨γ射束立体定向放射治疗焦点剂量率和绝对剂量精度测量。方法：采用多源γ射束立体定向放射治疗系统及PTW-UNIDOS剂量仪、PTW 0.6 cc电离室、PTW 0.125电离室、PTW 0.015电离室、PTW-TW60008半导体探测器、EPSON10000 XL背透光扫描仪以及EBT2(ISP)免冲洗放射治疗胶片，测量γ射束立体定向放射治疗焦点剂量率和绝对剂量精度。结果：单纯采用电离室测量在射野直径＜3 cm聚焦野时，测量数据不能满足“头部立体定向放射外科γ辐射治疗源标准”要求。结论：γ射束立体定向放射治疗的焦点剂量率和绝对剂量测量，采用电离室结合高灵敏度半导体测量，能够较好地完成γ射束立体定向放射治疗质量控制工作。
목적：탐토γ사속입체정향방사치료초점제량솔화절대제량정도측량。방법：채용다원γ사속입체정향방사치료계통급PTW-UNIDOS제량의、PTW 0.6 cc전리실、PTW 0.125전리실、PTW 0.015전리실、PTW-TW60008반도체탐측기、EPSON10000 XL배투광소묘의이급EBT2(ISP)면충세방사치료효편，측량γ사속입체정향방사치료초점제량솔화절대제량정도。결과：단순채용전리실측량재사야직경＜3 cm취초야시，측량수거불능만족“두부입체정향방사외과γ복사치료원표준”요구。결론：γ사속입체정향방사치료적초점제량솔화절대제량측량，채용전리실결합고령민도반도체측량，능구교호지완성γ사속입체정향방사치료질량공제공작。
Objective: To provide effective and reliable methods to measure the focus dose rate and absolute dose accuracy for gamma-ray stereotactic radiotherapy. Methods: PTW-UNIDOS dosimeter, PTW 0.6cc/PTW-0.125/PTW-0.015 ionization chamber, PTW-TW60008 semiconductor detector, EPSON 10000 XL backlight scanner and EBT2(ISP)films were used to measure the focus dose rate and the absolute dose accuracy in the process of quality control for a multi-source gamma knife stereotactic radiotherapy system. Results:If the focused filed diameter is less than 3 cm, measurement data only using ionization chambers could not meet the requirements of “the criteria of γ radiation source for head stereotactic radio-surgery". Conclusion: For measurement of the focus dose rate and absolute dose of the gamma knife stereotactic radiotherapy system, it is effective and necessary to perform measurement combined ionization chambers with high-sensitivity semiconductor detector.