Study of Possibility to Reduce Flattening Filter Volume for Increasing Energetic Photons for High Radiotherapy Efficiency

Bencheikh, Mohamed; Maghnouj, Abdelmajid; Tajmouati, Jaouad; Lamrabet, Abdesslam; Benkhouy, Yassine

doi:10.3103/s0027134918660049

Cited by 9 publications

(2 citation statements)

References 8 publications

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“…24 The findings of our study are more significant than the previous one done by Chaney et al 25,26 We have previously studied the flattening filter design by analyzing the photon beam softening as a physical characterization for an eventual dosimetry quality improvement. 27,28…”

Section: Discussionmentioning

confidence: 99%

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

Bencheikh

Maghnouj

Tajmouati

et al. 2021

Polish Journal of Medical Physics and Engineering

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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.

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Section: Discussionmentioning

confidence: 99%

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

Bencheikh

Maghnouj

Tajmouati

et al. 2021

Polish Journal of Medical Physics and Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previously, the materials used in the flattening filter construction were studied to optimize the delivered dosimetry [1,2]. Then, we have studied the dosimetry quality for removing flattening filter from the Linac head [3,4], in parallel to study of the flattening filter geometry improvements [5,6] and the gain of dose while the flattening filter is removed from Linac head [7]. In this study, we are focused on secondary photons originated in the flattening filter (FF) which are investigated with the FF volume reduction percent in terms of fluence, energy fluence distribution, spectral distribution, mean energy and angular distribution at phantom surface.…”

Section: Introductionmentioning

confidence: 99%

Study of the volume reduction impact on secondary photons emergent from flattening filter for high radiotherapy quality

Bencheikh

Maghnouj

Tajmouati

et al. 2019

Polish Journal of Medical Physics and Engineering

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This study aims to investigate and evaluate the secondary photons characterizations under flattening filter (FF) for high radiotherapy quality in terms of fluence, energy fluence, energy fluence distribution, spectral distribution and angular spread distribution of secondary photons, which are mainly coming from primary collimator originated in the whole Linac head. However, the flattening filter illuminates the photons of low energy. After this component, the secondary photons of low energy are coming from flattening filter and secondary collimators that contaminate the dosimetry for deep tumor treatment. Fluence profile, energy profile and angular spread of secondary photons decreased with FF volume reduction percent but energy distribution and spectral distribution kept almost constant with FF volume reduction. The FF volume reduction allows reducing the secondary photons emergent from FF in number and in energy and it permits to increase the radiotherapy efficiency by decreasing the photons contamination when the cancer is treating.

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Analysis of stabilization of photon beam softening with off-axis distance for filtration system enhancement to increase dosimetry in radiotherapy

Bencheikh¹,

Maghnouj²,

Tajmouati³

et al. 2020

Journal of King Saud University - Science

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Study of Possibility to Reduce Flattening Filter Volume for Increasing Energetic Photons for High Radiotherapy Efficiency

Cited by 9 publications

References 8 publications

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

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

Study of the volume reduction impact on secondary photons emergent from flattening filter for high radiotherapy quality

Analysis of stabilization of photon beam softening with off-axis distance for filtration system enhancement to increase dosimetry in radiotherapy

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