| Fu Xiugen,Yuan Xianglin,Zheng Zu'an,et al.Preliminary application of optical surface monitoring system in intensity-modulated radiotherapy for thoracic tumors[J].Chinese Journal of Radiological Medicine and Protection,2019,39(2):101-106 |
| Preliminary application of optical surface monitoring system in intensity-modulated radiotherapy for thoracic tumors |
| Received:June 22, 2018 |
| DOI：10.3760/cma.j.issn.0254-5098.2019.02.004 |
| KeyWords:Thoracic tumors Image-guided radiotherapy(IGRT) Optical surface imaging Setup errors Cone beam computed tomography |
| FundProject: |
| Author Name | Affiliation | E-mail | | Fu Xiugen | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Yuan Xianglin | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Zheng Zu'an | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Lu Xiaoguang | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Gao Wensong | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Chao Tengfei | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Yin Longbin | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | | | Zhong Weiwei | Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China | 3119940655@qq.com |
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| Abstract:: |
| Objective To investigate the accuracy and application value of optical surface monitoring system in intensity modulated radiotherapy for thoracic tumors patients. Methods Twenty-eight patients with thoracic tumors were included. During each treatment fraction, the patients were immobilized with body surface markers and laser lamps. The surface images obtained by the optical surface monitoring system were registered with the reference images and recorded during the CBCT scan. The translation and rotation errors of x(left-right), y(craniocaudal) and z (anterior-posterior) axes were recorded. After scanning, the CBCT images were registered with the planned CT images and the translation and rotation errors of x, y and z axes were recorded. The setup errors of these two image systems were analyzed and corrected before each treatment. The correlation between the two sets of setup errors were analyzed with Pearson test, and systematic error (Σ) and random error (σ) were also calculated. The consistency of the two image systems was evaluated with the Bland-Altman method and the 95% limits of agreement were calculated. Results There was a good correlation between these two groups, and the correlation coefficients were 0.79, 0.62, and 0.53 in x, y and z axes, respectively. The Σ/σ of the optical surface monitoring system were 0.7 mm/1.5 mm, 0.9 mm/1.8 mm and 0.9 mm/1.5 mm in x, y and z axes, respectively. The Σ/σ of CBCT were 0.8 mm/1.6 mm, 1.3 mm/1.9 mm and 0.7 mm/1.5 mm in x, y and z axes, respectively. The 95% limits of agreement of translations direction were (-2.0-2.3), (-3.4-3.6) and (-3.3-2.4) mm, and the 95% limits of agreement of rotation direction were (-2.0 to 1.6)°, (-2.0 to 1.4)° and (-1.6 to 1.6)° in x, y and z axes, respectively. Conclusions The optical surface monitoring system is an effective image guide tool, which can quickly and accurately verify the patient's position and improve the position accuracy. It can be applied for positioning in the intensity modulated radiation treatments for the thoracic tumor patients. |
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