Analysis of Setup Error of Intensity-Modulated Radiation Therapy Guided by CT Images After Breast-Conserving Surgery for Breast Cancer
TANG Yan-pinga, LI Ling-jianb
a. Department of Radiology; b. Department of Neurosurgery, the Occupational Disease Hospital of Xinjiang Uygur Autonomous Region, Urumchi Xinjiang 830000, China
Abstract：ObjectiveTo explore the setup error guided by CT image of the postoperative intensitymodulated radiation therapy for breast-conserving surgery of breast cancer. Methods Eighteen patients who received conformal intensity modulated radiation therapy after their breast-conserving surgery for breast cancer were selected, CTVision image-guided radiation therapy system was applied, in terms of the setup error in three dimensional directions, electronic beam imaging system was used for the first, fifth and the tenth radiotherapy, altogether 108 frontal and lateral radiation field images were captured, and compared them with the frontal and side standard beam digital reconstruction images, then beam setup error was measured.ResultsRecord all the setup errors of the patients in the X axis direction (left and right), Y axis direction (head to foot) and the Z axis direction (front and back) of their the first, fifth and tenth radiotherapy with accelerator, which are respectively: X1(2.6±0.8) mm, Y1(2.8±0.7)mm, Z1(1.7±0.7)mm; X2(3.2±0.5)mm, Y2(3.6± 0.8)mm, Z2(2.0±0.4)mm; X3(3.4±0.9)mm, Y3(3.8±0.6)mm, Z3(2.4±0.5)mm. X1 and Y1, X2 and Y2, as well as X3 and Y3 were compared with Z1, Z2 and Z3 respectively, results showed that their differences were statistically significant (P＜0.05).ConclusionThe application of CT image guided intensity-modulated radiotherapy in breast cancer in postoperative patients can ensure that the setup error is within acceptable error range of radiotherapy, which is worthy of clinical popularization and application.
汤艳萍a，李令建b. 乳腺癌保乳术后调强放射治疗在CT图像引导下的摆位误差分析[J]. 中国医疗设备, 2017, 32(1): 87-89.
TANG Yan-pinga, LI Ling-jianb. Analysis of Setup Error of Intensity-Modulated Radiation Therapy Guided by CT Images After Breast-Conserving Surgery for Breast Cancer. China Medical Devices, 2017, 32(1): 87-89.
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