数字化模拟定位机在肿瘤放疗中的应用

The application of digital simulation positioning machine in radiation therapy oncology

目的:探讨数字化模拟定位机在肿瘤放疗中的应用。方法:利用数字化模拟定位机于等中心复位时分别拍摄0°、90°方向、面积10×10 cm2矩形野和任意野号的适时野数字化模拟机图像,分别将拍摄的图像与TPS相对应的DRR图像通过骨性标志匹配测量出等中心点的误差和适时野误差。再利用直线加速器Iview-GT系统用同样的方法拍摄矩形野和适时野EPID图像,并与TPS相对应的DRR图像通过骨性标志匹配测量出等中心点误差和适时野误差。将数字化模拟定位机所测得的各项误差与Iview-GT系统所测得的误差进行比较。结果:数字化模拟定位机所测得的等中心点误差和适时野误差结果均优于Iview-GT系统所测得误差(均P=0.000)。结论:数字化模拟定位机在肿瘤放疗中的应用能够更准确地对各项误差进行测量,纠正摆位偏差,使得放疗定位更精确,治疗更准确。

Objective To discuss the application of digital simulation positioning machine in radiation oncology. Methods We used digital simulation positioning machine to shoot isocenter reset digital simulator images of 0 degrees direction and 90 degrees direction, 10 x 10 cm2 rectangular field and actual time radiation field with any field number. Compared the images taken with the TPS corresponding DRR image through bone marker matching to measure the error of isocenter and actual time radiation field , the linear accelerator Iview-GT system with the same method was shot in rectangular field simulator the same field number EPID image , and the TPS corresponding DRR image. Finally, we compared the measured error of the digital simulator positioning machine with the error of Iview-GT system image. Results The result of measured isocenter error of the digital simulator positioning machine was better than EPID image error （P=0.000）. Conclusion The application of digital simulation positioning machine in radiation oncology can be more accurate to measure the error and correct the position deviation, however, it can also make the radiotherapy and the treatment more accurate.