Acceptance test of M6 CyberKnife stereotactic radiotherapy system(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2023年第7期
- Page:
- 814-821
- Research Field:
- 其他（激光医学等）
- Publishing date:
Info
- Title:
- Acceptance test of M6 CyberKnife stereotactic radiotherapy system
- Author(s):
- SU Kunpu; ZHOU Deli; LI Linshan; SI Mengyuan; XIAO Yao; LIU Yanhai; MA Jungang; LI Mengxia; CHEN Chuan
- Department of Oncology, Army Medical Center of PLA, Chongqing 400042, China
- Keywords:
- Keywords: M6 CyberKnife dose characteristics end-to-end test acceptance test
- PACS:
- R318；R811
- DOI:
- 1005-202X（2023）07-0814-08
- Abstract:
- Abstract: Objective To conduct a clinical acceptance test on M6 CyberKnife stereotactic radiotherapy system for evaluating its safety and accuracy. Methods Referring to the standards and methods of Accuray and relevant domestic and international standards, the 6 subsystems of M6 CyberKnife including KUKA robot, patient positioning, target positioning, variable collimator, linear accelerator and treatment plan were evaluated, and an end-to-end test was carried out to analyze its overall irradiation accuracy. Results The average deviation of all nodes in the robot system was ≤ 0.08 mm, and the maximum was ≤ 0.311 mm. The system deviation of treatment couch was as follow: anterior-posterior (x)=0.4 mm, left-right (y)=0.1 mm, superior-inferior (z)=0 mm, left-to-right rotation (r)=0.1°, superior-to-inferior rotation (p)=0°. In target positioning system, A image center deviations were x=0.23 mm, y=-0.31 mm, and B image center deviations were x=0.28 mm, y=-0.35 mm the tracking deviations were as follow: x=0 mm, y=0.1 mm, z=0.1 mm, r=0.1°, p=-0.1°. The maximum repeatability deviation of each size of the iris collimator was 0.32 mm. For linear accelerator, the field consistency deviations at SAD=800 mm were x=0.23 mm, y=0.35 mm. The evaluation on beam performance showed that the dose stability, dose output linear deviation, iris transmittance and fixed transmittance were 0.06%, ≤0.53%, 0.09% and 0.14%, respectively. The penumbral, symmetry and flatness of 60 mm fixed collimator were 4.2 mm, 100.8% and 109.7%, respectively. The maximum dose depth was 15.5 mm, and the [TPR2010] was 0.633. For treatment planning system, the image geometric deviations were x=0.071 mm, y=-0.173 mm, z=0.361 mm planning point dose deviation was 0.08% and the deviation of monitor units in manual calculation was 0.04%. End-to-end test revealed that the accuracies of fixed collimator were 0.47 mm for 6D skull tracking, 0.45 mm for Fiducial tracking, 0.77 mm for Xsight spine tracking, 0.50 mm for synchrony respiratory tracking, -0.42 mm for lung tracking, and that the tracking accuracies of iris collimator were 0.23, 0.69, 0.70, 0.51 and 0.73 mm, respectively. Conclusion M6 CyberKnife as a sub-millimeter-level stereotactic radiosurgery equipment satisfy the acceptance criteria, and its accuracy and reliability meet the clinical requirements.
Last Update: 2023-07-15