Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


Cross-Disciplinary Physics and Related Areas of Science and Technology

J. Korean Phy. Soc. 2010; 56(1): 164-170

Published online January 15, 2010

Copyright © The Korean Physical Society.

 Estimation of the Real-time Respiratory Simulation System in CyberKnife Image-guided Radiosurgery

Suk Lee, Chul Kee Min, Weon Kuu Chung, Jang Bo Shim, HyunDo Huh, SangHoon Lee, SamJu Cho, Sangwook Lim, Kwang Hwan Cho, Chul Yong Kim, Jong Soo Lim, Soo Il Kwon



The purpose of this study was to evaluate the target accuracy according to the movement of the respiration of an actual patient as a quantitative way through developing a real-time respiratory simulation system (RRSS) including a patient customized 3D moving phantom. The real-time respiratory simulation system (RRSS) consists of two robots in order to implement both the movement of body surfaces and the movement of internal organs caused by respiration. The quantitative evaluation for the 3D movement of the RRSS was performed using a real-time laser displacement sensor for each axis. The average difference in the static movement of the RRSS was about 0.01 ~ 0.06 mm. Also, in the results of the evaluation of the dynamic movement by producing a formalized sine wave with the phase of four seconds per cycle, the difference between the measured and calculated values for each cycle length in the robot that is in charge of body surfaces and the robot that is in charge of the movement of internal tumors showed 0.10 ~ 0.55 seconds, and the correlation coefficients between the calculated and the measured values were 0.998 ~ 0.999. The differences between the maximum and the minimum amplitudes were 0.01 ~ 0.06 mm, and the reproducibility was obtained within �0.5 mm. In the case of the application and non-application of respiration, the target errors were obtained by -0.05 ~ 1.05 mm and -0.13 ~ 0.74 mm, respectively, and the entire target errors were 1.30 mm and 0.79 mm, respectively. Based on the accuracy in the RRSS system, various respiration patterns of patients can be reproduced in real-time. Also, it can be seen that this system can be used as an optimal tool for applying patient customized accuracy management in image-guided radiosurgery.

Keywords: Synchrony, CyberKnife, RRSS (Real-time Respiratory Simulation System), tracking