Abstract:Objective To investigate how to measure radiotherapy positioning errors for cervical cancer by cone-beam computed tomography (CBCT) so as to analyze the reasons for errors. Methods According to the waist circumference (wc), the patients were divided into three groups: normal (wc ≤80 cm), overweight (80 cm < wc < 90 cm), and fat (wc≥90 cm). The positions of 32 cervical cancer patients were stabilized by vacuum bags, and then location CT scan was performed. Before radiotherapy, the images from CBCT was compared to images from location CT to obtain the shift data. Shift data were recorded in the x-axis (left-right), the y-axis (superior-inferior) and z-axis (head-foot) directions. Results The positioning errors on x direction of three groups of patients were (0.8±2.5) mm, (1.5±2.0) mm, (0.2±3.8) mm; the set-up errors on y direction were (-1.3±2.1) mm, (-0.5±2.3) mm, (-0.6±3.5) mm; the set-up errors on z direction were (0.2±3.8) mm, (-0.6±3.5) mm, (0.9±5.5) mm. Conclusion In the course of radiotherapy for cervical cancer patients, image-guided radiotherapy (IGRT) should be selected according to patients’ physical circumstances. As for fat figures, with much fat in abdomen or breech, IGRT should be adopted.
王陆州,徐细明. 基于锥形束CT的宫颈癌患者放疗摆位误差分析[J]. 中国医疗设备, 2015, 30(11): 105-106.
WANG Lu-zhou, XU Xi-ming. Analysis of Radiotherapy Positioning Errors by CBCT for Cervical Cancers. China Medical Devices, 2015, 30(11): 105-106.
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Remeijer P,Geerof E,Ploeger L,et al.3D portal image analysis in clinical practice:an evaluationg of 2D and 3D analysis techniques as to 30 prostate cancer patients[J].Int J Radiat Oncol Biophys,2000,46(5):1281-1290.
[2]
Remeijer P,Geerof E,Ploeger L,et al.3D portal image analysis in clinical practice:an evaluationg of 2D and 3D analysis techniques as to 30 prostate cancer patients[J].Int J Radiat Oncol Biophys,2000,46(5):1281-1290.
[3]
Stroom JC,de Boer HC,Huizenga H,et al.Inclusion of geometrical uncertainties in radiotherapy treatment planning by means of Coverage probability[J].Int J radiat Oncol Bio phys,1999,43(4):905-919.
[3]
Stroom JC,de Boer HC,Huizenga H,et al.Inclusion of geometrical uncertainties in radiotherapy treatment planning by means of Coverage probability[J].Int J radiat Oncol Bio phys,1999,43(4):905-919.