Feasibility study of applying domestic medical linear accelerators in stereotactic radiotherapy(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2019年第2期
- Page:
- 130-135
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Feasibility study of applying domestic medical linear accelerators in stereotactic radiotherapy
- Author(s):
- NIE Xin; HAN Jun; YANG Jing; ZHU Xiaohui; LIU Gang; LIU Hongyuan; CAO Ting; LIANG Zhiwen; CHEN Mi; LI Qin
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
- Keywords:
- ; Keywords: medical linear accelerator; stereotactic radiotherapy; technical performance; evaluation system
- PACS:
- R312；R815
- DOI:
- DOI:10.3969/j.issn.1005-202X.2019.02.002
- Abstract:
- Abstract: Objective To evaluate the dose output, mechanical and radiation performances of 2 imported medical linear accelerators and 3 domestic medical linear accelerators for analyzing the performance of domestic medical linear accelerators and assessing whether it is suitable for stereotactic radiotherapy. Methods Two imported medical linear accelerators which stereotactic radiotherapy had already been treated on and 3 domestic medical linear accelerators with superior installed capacities were chose for research. The ionization chamber and electrometer were used to measure the dose output performance of the linear accelerators on water phantom. The mechanical precision of the linear accelerators was measured with coordinate paper, front pointer, scales and other tools. The radiation performance and multi-leaf collimator positioning accuracy were obtained by PIPSpro5.3.1 and doselab softwares, which provided great conveniences in analyzing the recorded radiation fields taken by solid water and EBT films. Results According to the AAPM TG-142 and the People’s Republic of China Pharmaceutical Industry Standard YY0832.2-2015, a complete set of evaluation criteria for domestic medical linear accelerators had been set up. The evaluation results showed that the accuracy, repeatability and linearity of the output dose of domestic medical linear accelerators are high; that the radiation field isocenters accuracies of gantry, collimator and couch were mostly less than 1 mm; that the average positioning accuracy of jaws and multileaf collimators was less than 0.5 mm; and that the end-to-end deviations of two kinds of domestic accelerators were less than 5%. All these results revealed that domestic medical linear accelerators had good basic performances. Conclusion The dose output and treatment accuracy of some domestic medical linear accelerator has already met the basic requirements of stereotactic radiotherapy. However, the relevant radiotherapy units should invest more manpower and corresponding equipments to carry out the quality assurance and quality control of the medical linear accelerator in order to promote stereotactic radiotherapy.
Last Update: 2019-02-26