Abstract

Info

Title:: Real-time motion tracking accuracy of optical surface imaging system

Author(s):: CHEN Li1; 2; BAI Long1; LI Guangjun1; QUAN Hong2; BAI Sen1; 1. Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China 2. School of Physics and Technology, Wuhan University, Wuhan 430072, China

Keywords:: optical surface imaging system respiratory motion tracking accuracy

Abstract:: Objective To explore the accuracy of real-time motion tracking using optical surface imaging system. Methods The respiratory curves of 30 patients were input into a phantom for simulating respiratory motion, and Catalyst system was used for tracking the real-time motion of the phantom. The respiratory curves recorded by the system were compared with the reference curves, thereby obtaining the real-time motion tracking accuracy of optical surface imaging system. Results The respiratory curves recorded by the system had a high consistency with the reference curves, and the correlation coefficient was higher than 0.99, indicating significant correlation. The average of tracking errors was (0.24±0.04) mm, and the error was decreased while the respiratory signal frequency was increased. Conclusion The optical surface imaging system which has a relatively high real-time respiratory motion tracking accuracy can be used for respiratory motion tracking. During respiratory gating treatment, the error introduced by the respiratory motion tracking system should be considered.