| Wang Xiaoyong,Liu Hui,Xie Conghua,Zhang Gong,Qiu Hui,Chen Ji,Tan Kang,Zhang Jun,Jin Jinsong,Jiang Zhou.The setup errors in postoperative radiotherapy for endometrial and cervical cancer by cone beam CT[J].Chinese Journal of Radiological Medicine and Protection,2014,34(7):523-525 |
| The setup errors in postoperative radiotherapy for endometrial and cervical cancer by cone beam CT |
| Received:October 11, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.07.011 |
| KeyWords:Endometrial cancer Cervical cancer Postoperative radiotherapy Cone beam computed tomography (CBCT) PTV margin |
| FundProject: |
| Author Name | Affiliation | E-mail | | Wang Xiaoyong | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Liu Hui | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | liuhui69_wh@hotmail.com | | Xie Conghua | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Zhang Gong | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Qiu Hui | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Chen Ji | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Tan Kang | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Zhang Jun | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Jin Jinsong | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | | | Jiang Zhou | Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China | |
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| Abstract:: |
| Objective To analyze the setup errors in postoperative radiotherapy for endometrial and cervical cancer and to determine the margin required for clinical target volume (CTV) extending to planning target volume (PTV) (MPTV).Methods The setup errors of 26 endometrial and cervical cancer patients receiving postoperative radiotherapy from April to June 2013 were measured and analyzed in this study. Linear errors(x, y, z axis) were obtained by cone beam CT (CBCT). MPTV were determined. Results Setup errors were unavoidable in postoperative endometrial and cervical cancer irradiation.The setup errors(systemic±random)on x (left-right),y (superior-inferior),z (anterior-posterior) directions were(0.21±3.23),(0.55±3.51)and(0.08±2.76)mm, respectively. The spatial distributions of setup error was maximum in y direction, the second in x direction and the minimum inz direction. The difference of setup errors in x,y,z directions was not statistically significant. MPTV was 5.44 mm in x axis,7.26 mm in y axis,5.68 mm in z axis, repectively. Conclusions The influence of setup errors of a PTV margin would be suggested by 5.5,7.5 and 6 mm on x (left-right),y (superior-inferior),z (anterior-posterior) directions for postoperative radiotherapy for endometrial and cervical cancer. |
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