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Modified electron beam output calibration based on IAEA Technical Report Series 398
Supriyanto Ardjo Pawiro1, Dwi Aprilia Mahfirotin1, Muhamad Iqbal Assegab2
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, West Java, Indonesia.
Journal of Applied Clinical Medical Physics
|February 28, 2022
Summary
This study introduces a modified electron beam calibration method based on the International Atomic Energy Agency (IAEA) Technical Report Series (TRS)-398. The modified calibration, using cylindrical chambers, provides clinically acceptable and simpler dosimetry results within the TRS-398 tolerance limits.
Area of Science:
- Medical Physics
- Radiation Oncology
- Dosimetry
Background:
- Standard electron beam reference dosimetry relies on IAEA TRS-398 and AAPM TG-51 protocols.
- Previous work modified AAPM TG-51 calibration, finding cylindrical chambers acceptable for low-energy electron beams.
Purpose of the Study:
- To propose and report a modified electron beam calibration method based on the IAEA TRS-398 protocol.
- To evaluate the clinical applicability and simplicity of the modified calibration.
Main Methods:
- Energies from 6 to 15 MeV were used, generated by Elekta Synergy Platform and Versa HD linear accelerators.
- Charge readings were obtained using PTW 30013, IBA CC13, Exradin A1Sl, and Exradin A11 chambers.
- A modified calibration equation incorporating an updated k-factor was applied to calculate absorbed dose to water (cGy/MU).
Main Results:
- The modified calibration was successfully implemented using cylindrical chambers across all tested energies and an updated k-factor.
- The ratio of absorbed dose to water between original and modified TRS-398 protocols was 1.002 (Elekta Synergy) and 1.000 (Versa HD) for cylindrical chambers.
- For parallel-plate chambers, the ratios were 1.013 (Elekta Synergy) and 1.014 (Versa HD), all within the ±2% tolerance of TRS-398.
Conclusions:
- The modified TRS-398 electron beam calibration, utilizing cylindrical chambers, yields acceptable dosimetry results.
- This modified approach is simpler for clinical use compared to the original TRS-398 protocol.
- Both cylindrical and parallel-plate chambers remain within the acceptable tolerance limits of the TRS-398 protocol.
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