Enhancement of the Dose on 12 MV Linac with Free Flattening Filter Mode
Journal Title: Journal of Biomedical Physics and Engineering - Year 2019, Vol 9, Issue 4
Abstract
Purpose: In the last years, some studies investigated dosimetric benefits of a free flattening filter for the photon mode in the radiotherapy field. This study aims to provide a theoretical study published and analysis of basic dosimetric properties for a Saturne 43 Linac head to implement free flattening filter beams clinically. Material and Methods: This is the first Monte Carlo study for the head of Saturne 43 with replacement flattening filter mode investigating beam dosimetric characteristics, including central axis absorbed doses, beam profiles and photon energy spectra. The later ones were analyzed for flattening filter and replacement flattening filter beams using BEAMnrc and DOSXYZnrc Monte Carlo codes for 10 × 10 cm2 , 5 × 5 cm2 and 2 × 2 cm2 square field sizes. Results: A 3.94-fold increase of dose rate and electron contaminating increased by 246.4 % with the replacement flattening filter mode for field size of 10 × 10 cm2 . Reduction was made by replacement flattening filter beam in the peripheral dose up to 30%, and the time was reduced more than 50 %. Conclusion: Results obtained from our study revealed that some characteristic dosimetries such as the maximum increase in depth dose rate, decrease in out-ofdepth dose, and reducing time can be beneficial for the unflattened beam to be used in the radiotherapy for the advanced techniques. Citation: Zeghari A, Saaidi R, Cherkaoui El Moursli R. Enhancement of the Dose on 12 MV Linac with Free Flattening Filter Mode. J Biomed Phys Eng. 2019;9(4):437-444. https://doi.org/10.31661/jbpe.v0i0.924.
Authors and Affiliations
A. Zeghari, R. Saaidi
Keywords
Related Articles
- EP ID EP647183
- DOI -
- Views 87
- Downloads 0
Signal Intensity of High B-value Diffusion-weighted Imaging for the Detection of Prostate Cancer
Background: Diffusion-weighted imaging (DWI) is a main component of multiparametric MRI for prostate cancer detection. Recently, high b value DWI has gained more attention because of its capability for tumor characteriza...
Protective Effects of IMOD and Cimetidine against Radiation-induced Cellular Damage
Radiation damage is to a large extent caused by overproduction of reactive oxygen species (ROS). Radioprotectors are agents or substances that reduce the effects of radiation in healthy normal tissues while maintaining t...
A Comparison of Six Ultrasound Stimulation Types on Pseudomonas Aeruginosa Growth in Vitro
Background: This work evaluated the efficiency of common ultrasound stimulation (U.S.S) types on bacterial growth in vitro using clinically relevant conditions. Objective: To estimate different frequencies ultrasound bac...
Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students
Background: In spite of the increasing degree of automation in industry, manual material handling (MMH) is still performed in many occupational settings. The aim of the current study was to determine the maximum acceptab...
A Semi-Automatic Algorithm for Estimating Cobb Angle
Background: Scoliosis is the most common type of spinal deformity. A universal and standard method for evaluating scoliosis is Cobb angle measurement, but several studies have shown that there is intra- and inter- observ...