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目的:探讨乳腺癌保乳术后俯卧位适形调强放射治疗采用BionixRT-6025胸部俯卧位系统的摆位误差。方法:20例乳腺癌保乳术后行适形调强放射治疗,采用BionixRT-6025胸部俯卧位系统固定,使用电子射野影像系统(EPID)对首次放疗、第十次放疗摄取适形调强放疗的正、侧位共80幅射野图像,与计划系统的正、侧位标准射野数字重建图像(DRR)进行比较,测得摆位误差。结果:20例患者左右方向(X)、头脚方向(Y)、前后方向(Z)在加速器下的首次放疗和第十次放疗的摆位误差X±s(mm)分别为x1(2.7±0.7)mm、y1(2.9±0.8)mm、z1(1.8±0.5)mm和x2(3.0±0.6)mm、y2(3.4±0.7)mm、z2(1.9±0.5)mm。x1较z1、y1较z1、x2较z2、y2较z2,差异均有统计学意义(P<0.05)。结论:采用BionixRT-6025胸部俯卧位系统行保乳术后患者放疗的摆位误差在放疗可接受误差范围之内,值得推广应用。
OBJECTIVE: To investigate the setup error of the prone position system of BionixRT-6025 in prone position with breast augmentation after breast-conserving surgery. Methods: Twenty cases of breast cancer after breast-conserving surgery underwent conformal IMRT. BionixRT-6025 chest prone position system was used. The electronic radiography system (EPID) was used to adjust the intensity of the first radiotherapy and the tenth radiotherapy A total of 80 radiological images of lateral radiotherapy and radiotherapy were compared with the standard radiological reconstruction digital images (DRR) of the lateral and lateral radiographs of the planning system to determine the positioning errors. Results The setup errors X ± s (mm) of the first radiotherapy and the tenth radiotherapy under the accelerator in the left and right directions (X), head and foot direction (Y) and anteroposterior direction (Z) were x1 (2.7 ± Y1 (2.9 ± 0.8) mm, z1 (1.8 ± 0.5) mm and x2 (3.0 ± 0.6) mm, y2 (3.4 ± 0.7) mm and z2 (1.9 ± 0.5) mm, respectively. Compared with z1 and y1, z1 and z2 are higher than z2 and z2, respectively. The differences are statistically significant (P <0.05). Conclusion: BionixRT-6025 chest prone position system after breast-conserving surgery in patients with radiotherapy setting error within the acceptable range of radiotherapy errors, it is worth promoting the application.