Clinical testing of a novel domestic two-dimensional matrix dosimetric verification system(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第8期
- Page:
- 945-950
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Clinical testing of a novel domestic two-dimensional matrix dosimetric verification system
- Author(s):
- KANG Shengwei1; 2; WANG Pei1; 2; QI Guohai1; 2; LIU Cao3; GONG Lan3; LI Jie1; 2; XIAO Mingyong1; 2; TANG Bin1; 2; LANG Jin-yi1; 2
- 1. Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, Chengdu 610041, China 2. School of Medicine, University of Electronic Science and Technology of China, Chengdu 610041, China 3. National Institute of Measurement and testing technology, Chengdu, 610000, China
- Keywords:
- Keywords: two-dimensional matrix dose verification clinical testing
- PACS:
- R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.08.001
- Abstract:
- Abstract: Objective To test a new type of domestic two-dimensional (2D) matrix dosimetric verification system in the clinical condition for evaluating whether the system can meet the clinical requirements. Methods The medical linear accelerator which was used to test the domestic 2D matrix dosimetric verification system was firstly tested and adjusted according to GB15213-94, thus ensuring that the accelerator met the national standard. Then the new type of domestic 2D matrix dose verification system is used for testing the repeatability of absolute dose measurement and dose linearity in the standard radiation field, flatness and symmetry, and validating actual radiotherapy plans. Results The test on the repeatability of absolute dose measurement in the standard radiation field showed that the coefficient of variation was less than 0.7%, which was consistent with the test requirements. There was no significant difference in the test results of dose linearity in the standard radiation field between 2D matrix dosimetric verification system and ionization chamber. The test also revealed that both flatness (within ±3%) and symmetry (within ±2%) met the clinical requirements. Moreover, the validation of actual treatment plans showed that the gamma passing rates were all above 98%, which fully satisfied the clinical requirements. Conclusion The novel domestic 2D matrix dosimetric system can be used to not only measure point and planar doses for the evaluation of the basic dose performances of the accelerator, but also realize the import of the DICOM data exported from the treatment planning system which are then compared with actual measurements, thereby meeting the clinical plan verification requirements.
Last Update: 2020-08-27