Journal of Kerman University of Medical Sciences

Comparison of Megavoltage Electron Dosimetry Beams in Radiation Therapy Using Different Protocols

Document Type : Original Article

Authors

Zahra Jomehzadeh 1
Ali Jomehzadeh 2

1 Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran

2 Department of Medical Physics, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran

https://doi.org/10.34172/jkmu.2024.03
Abstract
Background: International Atomic Energy Agency (IAEA) and American Association of physicist in Medicine (AAPM) have introduced new protocols for dosimetry of electron and photon megavoltage beams and increased them to more than five protocols at the beginning of new decade. Selecting a protocol by medical physicists and acquiring skill for using reference conditions and recommended formulation by each protocol necessitate recognition of various dosimetry protocols. The aim of this study was to compare the protocols TRS-277, TRS-381, and TRS-398 of IAEA for megavoltage electron beams used in radiation therapy.
Methods: Comparison of TRS-398 with other protocols was done as follows:
1. Measurement and estimation of the absorbed dose of 6MeV Neptun 10 linear accelerator through ionization chamber with parallel NACP plates in water phantom and acrylic.
2- Measurement of the absorbed dose in 17MeV Saturn 20 linear accelerator through ionization chamber with parallel NACP plates in water phantom
Results: The results indicated that the differences observed between the protocols compared to TRS-398 protocol was between -4.9 and 0.2%; the highest difference was related to 17 MeV electron beam using TRS-277 protocol.
Conclusions: According to the results, the considerable difference observed in 17MeV electrons was related to TRS-277 and TRS-388 protocols. Given that calibration ratio of the absorbed dose in air is used in the TRS-277 protocol, the difference obtained was related to the application of secondary calibration used in this research.

Highlights

Zahra Jomehzadeh(google scholar)(pubmed)

Ali Jomehzadeh(google scholar)(pubmed)

Keywords

Dosimetry protocols
Electron
Radiation Therapy
Subjects
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Journal of Kerman University of Medical Sciences
Volume 31, Issue 1
March and April 2024
Pages 17-22

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