a.Department of Equipment; b.Department
of Radiotherapy, State Key Laboratory
of Oncology in Southern China (Cancer
Center of Sun Yat-sen University),
Guangzhou Guangdong 510060, China
Abstract:Objective To develop a digital device for measuring the dose output of medical accelerator in
the morning check. Methods It was constructed by a single tablet ionization chamber and PIC16F877
single chip processor. The measurement of output dose under the medical accelerator was performed
according to the document of JJG912-2010, and the dosimetry characteristics of the medical accelerator
was tested by morning check device. Results In the range of 50~400 MU, the measured dose was linear.
The correlation coefficients of linear fitting were approximately 1.00 and the maximum deviation was
smaller than 0.4%. In a single measurement, the maximum deviation of measurement repeatability was
better than 0.3%. The maximum deviation was less than 0.3% for different dose rates. In the long-term
(half-year) testing process, the reproducibility of device was better than 1%. Conclusion Dosimetry
characteristics of the device can meet the requirements of JJG912-2010 Verification Regulation of Ion
Chamber Dosimeters Used in Radiotherapy. The research and development of the device can be used to
measure the relative dose of the Linac in daily tests.
张咏波a,陈立新b. 数字化晨检仪的研制[J]. 中国医疗设备, 2017, 32(4): 42-45.
ZHANG Yong-boa, CHEN Li-xinb. Development of the Digital Morning Check Device. China Medical Devices, 2017, 32(4): 42-45.