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All Journal Spektra: Jurnal Fisika dan Aplikasinya BULETIN FISIKA
Azzi, Akbar
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Universitas Indonesia
Aerospace Engineering Astronomy Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics

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THE COMPARISON OF 2D DOSE PATIENT-SPECIFIC QUALITY ASSURANCE BETWEEN MONTE CARLO-CONVOLUTION AND MODIFIED CLARKSON INTEGRATION ALGORITHM Azzi, Akbar; Pawiro, Supriyanto Ardjo; Mart, Terry
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 2 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 2, August 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.082.01

Abstract

A sophisticated machine of radiotherapy treatment process follows the complexity of the quality assurance (QA) measurement. Non-measurement QA becomes one of the solutions to reduce the medical physicists’ workload. However, this method has not been clinically established. This study compared two non-measurement methods of patient-specific quality assurance (PSQA) to find the feasible algorithm for the adaptive radiotherapy process. Monte Carlo-based (MC) PSQA used a phase space file of the medical linear accelerator (Linac) to obtain the photon energy fluence and forward projected to the isoplane. In contrast, Modified Clarkson Integration-based (MCI) used a non-uniform fluence map in the isoplane. For the modulated intensity, we used a pair of the dynamic log files of the multileaf-collimator (MLC) and then employed them in the algorithms. The dose distributions of MC and MCI methods were compared to the treatment planning system (TPS) using gamma index analysis. We found that the gamma pass rates (GPR) for MC-TPS and MCI-TPS were 99.54% and 99.57%, respectively. Further, the dose distribution in the off-axis region for the MCI method showed lesser accuracy due to the higher secondary dose contribution. The linac log file information can be used and calculated into a 2D dose distribution using both MC and MCI methods, providing high-accuracy results.
Calculation of TVL and HVL for Shielding Requirements in Radiotherapy Facilities using Monte Carlo Simulation Dewa Ngurah Yudhi Prasada; Akbar Azzi
BULETIN FISIKA Vol. 26 No. 2 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i02.p02

Abstract

Shielding is a critical aspect of radiation therapy facility design to ensure the safety of both workers and the public. This study utilizes the Particle and Heavy Ion Transport System (PHITS) version 3.35 Monte Carlo code to evaluate the tenth-value layer (TVL) of four common materials, like water (1 g/cm³), concrete (2.35 g/cm³), steel (7.8 g/cm³), and lead (11.36 g/cm³), under various photon beam energies of Ir-192 and Co-60 and with various linac energy of 6 MV, 10 MV, and 15 MV, that representing sources typically used in brachytherapy and external beam radiotherapy. The point source, isotropic source, and collimated source were utilized in this research. Results show that TVL values increase with higher beam energy and decrease with denser materials, following the known principles of radiation attenuation. However, an anomaly was observed in lead, where TVL values decreased at energies ≥10 MV, possibly due to pair production effects, which warrants further investigation. None of the results precisely matched the reference values from IAEA SRS-47, likely due to differences in beam spectrum and inherent filtration. These findings suggest that Monte Carlo simulation is a feasible method for estimating shielding requirements, but validation through measurement is recommended.
Co-Authors Dewa Ngurah Yudhi Prasada Supriyanto Ardjo Pawiro Terry Mart