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J Korean Soc Ther Radiol Oncol > Volume 20(4); 2002 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 2002;20(4): 381-390.
Development of a Dose Calibration Program for Various Dosimetry Protocols in High Energy Photon Beams
Dong Oh Shin, Sung Yong Park, Young Hoon Ji, Chang Geon Lee, Tae Suk Suh, Soo IL Kwon, Hee Kyung Ahn, Jin Oh Kang, Seong Eon Hong
1Department of Radiation of Oncology, College of Medicine, KyungHee University, Korea.
2Department of Medicine, College of Medicine, KyungHee University, Korea.
3Proton Therapy Center, National Cancer Center, Korea Cancer Center, Korea. cool_park@ncc.re.kr
4Department of Radiation Oncology, Korea Cancer Center, Korea.
5Department of Biomedical Engineering, College of Medicine, Catholic University, Korea.
6Department of Physics, Kyonggi University, Korea.
7Department of Anatomy, College of Medicine, Kyunghee University, Korea.
ABSTRACT
PURPOSE:
To develop a dose calibration program for the IAEA TRS-277 and AAPM TG-21, based on the air kerma calibration factor (or the cavity-gas calibration factor), as well as for the IAEA TRS-398 and the AAPM TG-51, based on the absorbed dose to water calibration factor, so as to avoid the unwanted error associated with these calculation procedures.
MATERIALS AND METHODS:
Currently, the most widely used dosimetry protocols of high energy photon beams are the air kerma calibration factor based on the IAEA TRS-277 and the AAPM TG-21. However, this has somewhat complex formalism and limitations for the improvement of the accuracy due to uncertainties of the physical quantities. Recently, the IAEA and the AAPM published the absorbed dose to water calibration factor based, on the IAEA TRS-398 and the AAPM TG-51. The formalism and physical parameters were strictly applied to these four dose calibration programs. The tables and graphs of physical data and the information for ion chambers were numericalized for their incorporation into a database. These programs were developed user to be friendly, with the Visual C++ language for their ease of use in a Windows environment according to the recommendation of each protocols.
RESULTS:
The dose calibration programs for the high energy photon beams, developed for the four protocols, allow the input of informations about a dosimetry system, the characteristics of the beam quality, the measurement conditions and dosimetry results, to enable the minimization of any inter-user variations and errors, during the calculation procedure. Also, it was possible to compare the absorbed dose to water data of the four different protocols at a single reference points.
CONCLUSION:
Since this program expressed information in numerical and data-based forms for the physical parameter tables, graphs and of the ion chambers, the error associated with the procedures and different user could be solved. It was possible to analyze and compare the major difference for each dosimetry protocol, since the program was designed to be user friendly and to accurately calculate the correction factors and absorbed dose. It is expected that accurate dose calculations in high energy photon beams can be made by the users for selecting and performing the appropriate dosimetry protocol.
Key Words: Air kerma, Absorbed dose to water calibration factor, Dosimetry, Protocol
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