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All Journal Journal of Physics: Theories and Applications Jurnal Profesi Medika: Jurnal Kedokteran dan Kesehatan Journal of Physics and Its Applications
Wahyu Edy Wibowo, Wahyu Edy
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Astronomy Earth & Planetary Sciences Education Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Physics

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english english Ulya, Syarifatul; Ryangga, Dea; Wibowo, Wahyu Edy; Nasution, Nuruddin; Pawiro, Supriyanto Ardjo
Jurnal Profesi Medika : Jurnal Kedokteran dan Kesehatan Vol 17 No 1 (2023): Jurnal Profesi Medika : Jurnal Kedokteran dan Kesehatan
Publisher : Fakultas Kedokteran UPN Veteran Jakarta Kerja Sama KNPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33533/jpm.v17i1.5848

Abstract

Regarding the increasing use of small-field photons in clinical treatment, in this study, we investigate the use of small-field electron beams in clinical treatment. This study aimed to evaluate small-field electron beam dosimetry of the nasopharyngeal, thyroid, and ethmoid sinus carcinoma cases. Dose measurement was done using EBT3 film. In nasopharyngeal cases with a homogenous area and irregular surface, the dose discrepancies for 6 MeV energy were unpredictable except for the 5×5 cm2 field size. For all energies in 5×5 cm2 field size, the dose discrepancies were less than 3%. In these cases, we found that a smaller electron beam field will increase the percentage of the dose discrepancy. This is caused by the effect of the lateral scatter disequilibrium in a small field electron beam. For ethmoid sinus cases, dose discrepancy depends on the field size and inhomogeneity of bone and tissue organ. Based on the evaluation of doses on the spinal cord, chiasm, and larynx (OAR), it can be seen that these organs received a very small dose. From this result, a small field electron beam is recommended for cases with a homogeneous target. However, in cases with a heterogenous target, further investigation is needed.
Verification of Point Dose on MU Calculator for Bleeding Cases Alhamid, Mohammad Zamakhsari; Ramadan, Arief Dian; Wibowo, Wahyu Edy; Anam, Choirul
Journal of Physics and Its Applications Vol 7, No 2 (2025): May 2025
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i2.24754

Abstract

Bleeding is a frequent issue among cancer patients, affecting about 6% to 10% of those with advanced-stage cancer. External radiation therapy is a highly effective method for reducing or even stopping bleeding, with success rates ranging from 45% to 100%. In bleeding cases, radiation therapy must be delivered quickly and precisely. To expedite the process, some standard steps in radiation therapy, such as the CT simulation and planning via the treatment planning system (TPS), are often skipped. Consequently, accurate Monitor Unit (MU) calculations are essential to ensure that the dose received by the patient does not deviate by more than 5%, as recommended by the ICRU. Using guidelines from AAPM TG 71, MU calculations were formulated and compiled into a Microsoft Excel worksheet called the MU Calculator. Several key parameters, including dose prescription, output factor (OF), and tissue maximum ratio (TMR), were input into the MU Calculator and verified through point dose verification on a slab phantom using the SAD technique. The verification was conducted using 10 MV energy across various field sizes (10 x 10, 12 x 12, 14 x 14, 16 x 16, 18 x 18, and 20 x 20) cm² at depths of 6, 8, and 10 cm, utilizing a PTW Farmer detector with dose prescriptions of 200, 300, and 400 cGy. The field size, depth, and dose prescription were selected to align with common requirements for bleeding cases. By applying the dose calculation formula recommended by TRS 398, the deviation between the prescribed and measured doses was found to be less than 2.5%. These deviations were attributed to factors such as measurement setup, temperature and pressure conditions, polarity effects, and detector recombination effects. The MU Calculator has been validated, demonstrating compliance with ICRU recommendations, and is thus suitable for use in bleeding cases that demand swift and precise external radiation therapy.
Gamma passing rate evaluation for IMRT and VMAT techniques based on gantry angles Zahro, Ummu Mar'atu; Zahroh, Fatimatuz; Maqsuroh, Fiki Hurum; Wibowo, Wahyu Edy
Journal of Physics: Theories and Applications Vol 9, No 2 (2025): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v9i2.109109

Abstract

Introduction: The accuracy of radiation dose delivery in advanced techniques such as Intensity Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT) is highly dependent on the consistency of gantry angle performance. This study aims to evaluate the effect of gantry angle variations on the gamma passing rate (GPR) in IMRT and VMAT treatment plans. Methods: IMRT and VMAT plans were created using the Monaco Treatment Planning System on a homogeneous slab phantom and delivered within a range of gantry angles, including 90°, 180°, 270°, and 360°. Measurements were performed using the 2D array PTW Octavius 1500 that delivered by Linac Elekta Synergy and analyzed with the Verisoft software, applying a 2%/2 mm gamma index with a 10% threshold and a 97% gamma passing rate criterion. Results: All plans achieved GPR above 97%. VMAT demonstrated higher GPR values than IMRT at gantry angles of 90°, 180°, 270°, with the largest difference of 0.8% observed at 270°. IMRT showed a slightly higher GRP value than VMAT at range gantry 360° with a difference of 0.1%.  Conclusion: The higher GPR value observed in VMAT indicates greater stability in relation to gantry angle variations. Although, IMRT performed slightly better at 360°, the difference was minimal. In general, gantry angle dependence was observed in both techniques, but the variation was not clinically significant.
Co-Authors Alhamid, Mohammad Zamakhsari Choirul Anam AM Diponegoro Fatimatuz Zahroh, Fatimatuz Maqsuroh, Fiki Hurum Nasution, Nuruddin Ramadan, Arief Dian Ryangga, Dea Supriyanto Ardjo Pawiro Ulya, Syarifatul Zahro, Ummu Mar'atu