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| E2E testing of Cyberknife lung tracking using a homemade lung phantom |
| WEI Xiao1, MA Xiangjie1, LI Mingsheng1, ZHANG Zhengzhao2, LIU Ya1, YANG Yuze3, CHENG Jinsheng1 |
1. National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China;
2. Department of Radiation Oncology, Fifth Medical Center of PLA General Hospital, Beijing 100071 China;
3. Institute of Radiation Medicine, Chinese Academy of Medical Sciences, Tianjin 300192 China |
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Abstract Objective To verify the feasibility of using a homemade lung phantom for quality control of Cyberknife by comparing the measurement results of the homemade lung phantom and CIRS dynamic phantom in E2E testing of Cyberknife lung tracking. Methods The patient treatment process was simulated, including CT positioning, plan design, irradiation implementation, film scanning, and analysis using the homemade phantom and CIRS phantom. The two phantoms were measured five times using MLC under the S7 generation Cyberknife and five times using Iris under the M6 generation Cyberknife. The differences in measurement results between the two phantoms were analyzed using independent sample t-test. Results For the S7 generation Cyberknife, the statistical analysis of differences between the two phantoms in the detection values on the X-axis, Y-axis, Z-axis, and total deviation showed P values of 0.236, 0.175, 0.289, and 0.668, respectively. For the M6 generation Cyberknife, the statistical analysis showed P values of 0.880, 0.891, 0.573, and 0.433, respectively. The P values were all > 0.05. Therefore, there were no statistically significant differences in the detection results between the homemade lung phantom and the CIRS phantom under the S7 and M6 generation Cyberknife. The total deviation values were <1.5 mm. Conclusion The homemade lung phantom and CIRS phantom have consistent measurement results in the E2E testing of Cyberknife lung tracking and meet the requirements of Report of AAPM TG-135 and WS 667-2019 standard. Therefore, the homemade lung phantom is feasible for clinical quality control of Cyberknife.
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Received: 26 August 2023
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