The application of the proton and carbon ion treatment equipment imaging system in prostate cancer therapy
Zhou Dan,Fu Shen,Li Ping,Yao Jiaxi
Department of Medical Physics (Zhou D,Yao JX),Department of Radiation Oncology (Fu S,Li P),Proton and Heavy Ion Center,Shanghai 201321,China;Department of Radiation Oncology,Cancer Hospital of Fudan University,Shanghai 200233,China(Fu S)Fu Shen,Email:shen_fu@hotmail.com
Abstract：Objective To evaluate the accuracy of the patient positioning in prostate cancer therapy with the kilo-volt X-ray imaging system. Methods From June to August in 2014,14 patients with prostate cancer were treated by carbon ion beam with the Siemens proton and carbon ion equipment. X-ray orthogonal images was made twice by the imaging system before treatment. All the images were fused with the planning digitally reconstructed radiograph ones by automatic and manual method. We got positioning error data in six directions:lateral,longitudinal,vertical,isocentre,roll and pitch. The data were analyzed to study the situation. Results A total of 644 pairs of images from 14 patients were obtained during treatment. The average error in six directions is 0.34 cm,0.30 cm,0.79 cm,0.3°,1.1° and 0.5°.The patients′ positioning error had no obvious change in all directions with fractions. There was no significant deviation between the two groups of images,either. But error in pitch and vertical direction is much larger. Conclusions The bony landmarks of the orthogonal filed images are clear. Photography lasts short time by the imaging system. DRR images are 3D and we can get images in six directions,but the development of soft tissue is weak. Positioning error we get cannot be match with the one of actual situation.
Zhou Dan,Fu Shen,Li Ping et al. The application of the proton and carbon ion treatment equipment imaging system in prostate cancer therapy[J]. Chinese Journal of Radiation Oncology, 2016, 25(2): 164-167.
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2016, Vol. 25 
