title: Real-time monitoring system with accelerator controlling: An improvement of radiotherapy monitoring based on binocular location and classification.
abstract: Real-time monitoring and amendment of patient position is important for the radiotherapy. However, using electronic portal imaging device (EPID) and cone beam computer tomography (CBCT) in the clinical practice generate different degrees of delay, so that they cannot achieve the purpose of real-time application. Meanwhile, a few products come with the function of the real-time monitoring and amendment, such as CyberKnife, which is too expensive for the common people. The objective of this study is to develop and test a novel independent system to monitor treatment center and amend the position of patient, which is applicable to most accelerators, based on binocular location. The system monitors the treatment center by tracking the markers attached to the patient. Once the treatment center shifts, the system uses the magic finger, which is developed to control the treatment bet automatically to adjust the treatment bed position. To improve the monitoring accuracy, we trained the data collected from the clinic based on SVM (Support Vector Machine). Thus, the training results assist users to adjust the feasible degree of the monitoring. The experiment results showed that using this new monitoring system, the monitoring resolution reached 0.5 mm, and the error ratio of the judgment was less than 1.5%.
authors.affiliation: Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Chai
authors.affiliation: Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
authors.forename: Da
authors.initials: D
authors.lastname: Chen
authors.affiliation: Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Tang
authors.affiliation: School of Electronic Science and Engineering, Nanjing University, Nanjing, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Ge
authors.affiliation: School of Electronic Science and Engineering, Nanjing University, Nanjing, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
mesh_terms: D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D056888:Patient Positioning / Q000379:methods*; D011881:Radiotherapy, Computer-Assisted / Q000379:methods*; D060388:Support Vector Machine; D014057:Tomography, X-Ray Computed
keywords: Real-time monitoring; Support Vector Machine; binocular system; magic finger