【摘要】 目的:通过PTW QUICKCHECK webline晨检仪分析加速器输出稳定性。方法:收集电离室更换前后加速器输出绝对剂量,回顾性分析PTW QUICKCHECK webline晨检仪对加速器的检测情况,并分析不同能量输出剂量的稳定性。结果:6、10 MV X射线以及6、9、12 Me V电子线中心轴输出剂量误差均在3%以内。方差分析显示此加速器不同能量输出稳定性无显著性差异(P>0.05)。PTW QUICKCHECK webline晨检仪检测发现每周输出剂量不断偏高,经进一步检测确认为电离室故障。更换电离室后输出剂量在标准值附近极小的范围内波动,保持较高的稳定性能。PTW QUICKCHECK webline晨检仪可以提前发现加速器存在的隐患,帮助物理师及时处理隐患。结论:使用PTW QUICKCHECK webline晨检仪对直线加速器输出剂量进行检测有利于确保直线加速器的准确性与稳定性,可有效地降低加速器系统误差,避免出现严重失误。更多还原

【Abstract】 Objective To analyze the output stability of a medical linear accelerator by PTW QUICKCHECK webline.Methods The absolute doses of the medical linear accelerator before and after the replacement of ionization chamber were collected in this study. The monitoring results of accelerator by PTW QUICKCHECK webline were retrospectively analyzed, and the output stabilities of different energies from the same accelerator were analyzed. Results The central-axis dose for 6, 10 MV X-ray and 6, 9, 12 MeV electron beams were within ±3%. Analysis of variance showed that there was no significant difference in the output stability of different energies from the same accelerator(P>0.05). The monitoring of PTW QUICKCHECK webline revealed that the output dose kept increasing, and the malfunction of ionization chamber was confirmed by the subsequent detection. After the replacement of ionization chamber, the output dose was close to the standard value and only fluctuated in a small range, having a high stability performance. Using PTW QUICKCHECK webline could detect the hidden danger of the accelerator in advance and help the physicist detect and eliminate the hidden danger in time. Conclusion The output dose measurement before daily treatment by PTW QUICKCHECK webline can ensure the accuracy and stability of the linear accelerator, effectively reduce the system error and avoid serious mistakes.更多还原