| Lin Zhanghua,Deng Xianzhi,Dong Fangfen,Chen Jing,Zheng Fen,Weng Xing,Xu Benhua,Li Xiaobo.Accuracy of the optically guided tracking system in radiotherapy[J].Chinese Journal of Radiological Medicine and Protection,2023,43(9):698-704 |
| Accuracy of the optically guided tracking system in radiotherapy |
| Received:April 12, 2023 |
| DOI：10.3760/cma.j.cn112271-20230412-00116 |
| KeyWords:Optically guided tracking system Image-guided radiotherapy Tracking accuracy Setup error |
| FundProject:福建医科大学启航基金项目资助（2020QH1078，2022QH1029）；福建省卫生健康青年科研课题（2022QNA018） |
| Author Name | Affiliation | E-mail | | Lin Zhanghua | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Deng Xianzhi | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Dong Fangfen | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Chen Jing | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Zheng Fen | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Weng Xing | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Xu Benhua | School of Medical Imaging of Fujian Medical University, Fujian Medical University Cancer Center, Fujian Key Laboratory of Intelligence Imaging and Precision Radiotherapy for Tumors, Clinical Research Center for Radiology and Radiotherapy of Fujian Province (Digestive, Hematological and Breast Malignancies), Fuzhou 350001, China | | | Li Xiaobo | Department of Radiation Oncology, Fujian Medical University Union Hospital, Fuzhou 350001, China
Department of Engineering Physics, Tsinghua University, Beijing 100084, China | lixiaobo2004@126.com |
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| Abstract:: |
| Objective To explore the tracking accuracy of the surface optically guided tracking system (OGTS) in radiotherapy.Methods Phantom verification and clinical trial verification were adopted. Specialized equipment was employed for the phantom verification. Specifically, the displacement of the optical markers as they moved from a predetermined position to the target position on the reflector ball platform was captured using the OGTS, and then the obtained displacement was compared with the fixed distance within the phantom to calculate the accuracy and repeatability of the OGTS. For the clinical trial verification, 45 patients treated with radiotherapy, which consisted of 15 cases with head, breast, and rectal tumors each, were selected to investigate the tracking accuracy and repeatability of the OGTS. For each patient, the values derived from the image-guided positioning system (IGPS) and the OGTS before and after image-guided setup error correction during three times of fractionated radiotherapy were randomly obtained. The translational errors of each error correction were also recorded. Before radiotherapy, patients' setup errors were corrected and relevant data were obtained using the IGPS. The correction result of translation errors obtained using the IGPS served as a gold standard to verify the accuracy of the OGTS in monitoring the translational motion of patients. Finally, the comprehensive translational deviation of both method was calculated.Results The phantom measurements showed that the comprehensive translational deviation for tracking accuracy and tracking repeatability of the OGTS had a maximum deviation and a standard deviation of 0.18 mm and 0.03 mm, respectively. The clinical trial result indicated that the tracking accuracy of IGPS and OGTS exhibited statistically significant differences only for the head in the z direction (t=2.21, P < 0.05). Conversely, no statistically significant differences were observed for the head in the remaining directions or for the breast and rectum in the three translational directions (P > 0.05). The analysis showed that comprehensive translational deviations for the head, breast, and rectum derived from OGTS and IGPS were (0.91±0.62), (1.64±1.30), and (1.52±1.29) mm, respectively, satisfying the requirement that the deviations should be below 2 mm.Conclusions The OGTS, featuring easy operation and high tracking accuracy, can assist the IGPS in real-time respiratory monitoring during radiotherapy. |
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