3D dose reconstruction of 6 MV medical linear accelerator based on modified ray tracing algorithm: A preliminary result

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Abstract

A 3D dose reconstruction could detect many errors for IMRT plans, including delivery machine error and suboptimal treatment plans, as well as enhanced visualization of the beam deviation on volume target. In this study, we aim to develop an in-house software based on MATLAB to enable 3D dose calculation model based on 2D energy fluence data. A homogeneous virtual water phantom, which has a density of 1 g/cm3, was used to test the 3D reconstruction. We reconstructed the field sizes of 4×4, 10×10, and 15×15 cm2 from jaws only collimating to ensure that the algorithm agrees with the small field, standard field, and maximum opening field, in intensity-modulated radiotherapy (IMRT) treatment procedure. The evaluation was done for percentage depth doses (PDDs) and beam profiles. We found that the photon attenuation varies with increasing depth but remains the same after 10 cm depth of water. Moreover, it depends on the flattening filter and jaws design. The PDD of our algorithm was found to agree with the Monte Carlo (MC) simulation, with the average dose differences 1.07 ± 1.45%, 1.14 ± 3.49%, and 1.11 ± 1.52% for the field sizes of 4×4, 10×10, and 15×15 cm2, respectively. A large error was found in the build-up region, but still within 10%. The dose difference on beam profile was evaluated at zmax equals 1.6, 5, and 10 cm. The highest dose deviation of beam profile to MC simulation was found to be-35.5 ± 9.14% for the field size of 4×4 cm2 at zmax and decreases with increasing depth and field size of the photon beam.

Original languageEnglish
Title of host publicationProceedings of the International Conference and School on Physics in Medicine and Biosystem, ICSPMB 2020
Subtitle of host publicationPhysics Contribution in Medicine and Biomedical Applications
EditorsLukmanda Evan Lubis, Nur Aisyah Nuzulia, Nur Rahmah Hidayati
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440876
DOIs
Publication statusPublished - 29 Mar 2021
Event2020 International Conference and School on Physics in Medicine and Biosystem: Physics Contribution in Medicine and Biomedical Applications, ICSPMB 2020 - Depok, Virtual, Indonesia
Duration: 6 Nov 20208 Nov 2020

Publication series

NameAIP Conference Proceedings
Volume2346
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2020 International Conference and School on Physics in Medicine and Biosystem: Physics Contribution in Medicine and Biomedical Applications, ICSPMB 2020
CountryIndonesia
CityDepok, Virtual
Period6/11/208/11/20

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