Application of On-Line Infrared Positioning System in Radiotherapy of
Nasopharyngeal Carcinoma
LI Ming1, JIN Jianhua1, XU Pengqin1, CHU Kaiyue1, GE Yun2
1. Department of Radiotherapy, Tumor Hospital Affiliated to Nantong University, Nantong Jiangsu 226361, China
2. School of Electronic Science and Engineering, Nanjing University, Nanjing Jiangsu 210046, China
Abstract：Objective To evaluate the accuracy of on-line infrared positioning System (OPS) in the measurement of setup error
in radiotherapy for nasopharyngeal carcinoma and the effect of OPS on the stability of interfractional setup error.
Methods A total of 59 nasopharyngeal carcinoma patients who received radiotherapy in our hospital from August 2017 to December
2018 (group A) were selected. OPS and cone-beam computed tomography (CBCT) were used to measure the setup error of the
patients in the group. The measurement results of the two methods were compared. The accuracy of OPS for setup error was analyzed.
A total of 48 nasopharyngeal carcinoma patients who received radiotherapy in our hospital from February 2019 to November 2020
(group B) were selected. The enrolled patients were set up with the help of OPS. CBCT was used to measure the setup error of the
first and second treatment sets of the enrolled patients, and the stability of setup error between the placement grades with the help
of OPS was analyzed. Results There was no statistically significant difference between CBCT and OPS in the measurement results
of translation and rotation errors of group A (P>0.05). Using CBCT to measure the setup error of group B, it could be seen that the
translation error was mainly within 1.5 mm and the rotation error was within 1°. There was no statistically significant difference in
translation and rotation errors between the first and second setup in group B (P>0.05). Conclusion OPS can not only accurately
measure the setup error of nasopharyngeal carcinoma patients, but also improve the setup repeatability with the help of its setup,
which is worthy of clinical application.
李明1，金建华1，徐朋琴1，储开岳1，葛云2. 在线红外定位系统在鼻咽癌放射治疗中的应用研究[J]. 中国医疗设备, 2022, 37(11): 39-42.
LI Ming1, JIN Jianhua1, XU Pengqin1, CHU Kaiyue1, GE Yun2. Application of On-Line Infrared Positioning System in Radiotherapy of
Nasopharyngeal Carcinoma. China Medical Devices, 2022, 37(11): 39-42.
