Detailed Monte Carlo analysis of the secondary photons coming out of the therapeutic X-ray beam of linear accelerator

• Autorzy: Bencheikh Mohamed , Maghnouj Abdelmajid , Tajmouati Jaouad , Didi Abdessamad , Lamrabet Abdesslam

Identyfikatory

DOI

10.2478/pjmpe-2021-0018

• Języki publikacji: EN

Abstrakty

EN

External photon beam radiotherapy is often used in tumor treatment. The photons are generated from the target which had stricken by the primary electron beam (incident particles). The photon beam contains the primary photons coming directly from the target and secondary photons coming from the photon interactions with head component materials (scattered photons). Altogether is thereafter used in radiotherapy treatment. This Monte Carlo study aims to investigate and evaluate the secondary radiations (photons) in terms of fluence, energy fluence, spectral distribution, mean energy and angular spread distribution. The secondary photons, which contributed in radiotherapy treatment, are examined and evaluated in number (fluence) and energy. At the phantom surface, the secondary photons originated in the whole linac head are mainly coming from the primary collimator. In 0.45% of secondary photons coming from the whole linac head, the primary collimator contributes by 86% and they are more energetic. However, the flattening filter and the secondary collimator contribute together by less than 14% and their photons are less energetic and then can deteriorate the beam dosimetry quality. To improve the radiotherapy treatment quality, the number of photons of low energy should be as low as possible in the clinical beam. Our work can be a basic investigation to use in the improvement of linac head configuration and specially the beam modifiers.

Słowa kluczowe

EN

beam modifiers; Monte Carlo simulation; secondary photons; BEAMnrc code; BEAMDP code

• Wydawca: Polskie Towarzystwo Fizyki Medycznej ; De Gruyter
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2021
• Tom: Vol. 27, Iss. 2
• Strony: 151--156
• Opis fizyczny: Bibliogr. 28 poz., rys.

Twórcy

autor

Bencheikh Mohamed

• Physics Department, Faculty of Sciences and Technologies Mohammedia, Hassan II University of Casablanca, Mohammedia, Morocco

autor

Maghnouj Abdelmajid

• LISTA Laboratory, Physics Department, Faculty of Sciences Dhar El-Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco

autor

Tajmouati Jaouad

• LISTA Laboratory, Physics Department, Faculty of Sciences Dhar El-Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco

autor

Didi Abdessamad

• Theoretical and Particle Physics and Modelling Laboratory, Faculty of Sciences, Mohammed 1st University, Oujda, Morocco

autor

Lamrabet Abdesslam

• LISTA Laboratory, Physics Department, Faculty of Sciences Dhar El-Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).