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Sosialisasi Pemanfaatan Fisika Radiasi dalam Bidang Kesehatan Kepada Siswa Kelas X di SMA Pramita Tangerang Manik, Josua Timotius; Soetanto, Wilson; Hanny, Morgan; Pandiangan, Tumpal
Journal of Community Services: Sustainability and Empowerment Vol. 2 No. 02 (2022): September 2022
Publisher : Center for Research and Community Service of Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/jcsse.v2i2.280

Pemahaman awal terhadap suatu bidang keilmuan mempengaruhi keputusan siswa dalam memilih jurusan untuk melanjutkan studi di perguruan tinggi. Fisika dengan konsentrasi medis merupakan salah satu jurusan yang relatif baru dan terus dikembangkan. Angka kebutuhan kerja untuk profesi fisikawan medik pun relatif tinggi. Namun hal ini belum didukung oleh ketersediaan informasi yang cukup mengenai penerapan ilmu fisika dalam bidang kesehatan di kalangan siswa SMA di kota Tangerang. Oleh sebab itu, program studi Fisika Universitas Matana merasa perlu untuk mensosialisasikan informasi tentang pemanfaatan fisika radiasi dalam bidang kesehatan dalam bentuk seminar dengan tujuan menambah wawasan siswa terkait pemanfaatan ilmu fisika untuk membantu mereka dalam menentukan pilihan studi lanjut di perguruan tinggi. Hasil pengabdian ini menunjukkan bahwa peningkatan pemahaman siswa bertambah setelah diadakannya kegiatan pengabdian. Mayoritas siswa juga menyatakan sangat puas atas diadakannya kegiatan pengabdian ini.

ANALISIS PENGARUH KETIDAKHOMOGENAN FANTOM TERHADAP DISTRIBUSI DOSIS ELEKTRON MENGGUNAKAN SIMULASI MONTE CARLO Gaspersz, Daniel Gibbor; Manik, Josua Timotius
Karst: Jurnal Pendidikan Fisika dan Terapannya Vol 7 No 2 (2024): Karst : Jurnal Pendidikan Fisika dan Terapannya
Publisher : Program Studi Pendidikan Fisika FKIP Universitas Muslim Maros

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46918/karst.v7i2.2241

The usage of homogeneous phantom in the calibration of LINAC is the standard in radiotherapy. However, a homogeneous phantom cannot accurately represent the complexity of the human body. This study was conducted to perform a Monte Carlo simulation of electron beam irradiation on an inhomogeneous phantom and then compare the resulting dose distribution values, in the form of PDD, with the PDD values obtained from a homogeneous phantom. Irradiation was performed with a 6.6 MeV electron beam on an inhomogeneous phantom resembling the human body. It was discovered that there is a significant difference between the R100 and R50 values of the inhomogeneous phantom in comparison to the homogeneous water phantom. The R100 value of the inhomogeneous value differs by 53.33% compared to the homogeneous phantom, while the R50 value differs by 41.07%. This indicates the influence of electron beam interaction with the inhomogeneous phantom on the resulting dose distribution. In the PDD curve, it is observed that the electron beam passing through the inhomogeneous medium experiences a greater loss of kinetic energy compared to the homogeneous medium. It was found that there’ a significant difference between the PDD values generated in the inhomogeneous phantom compared to the homogeneous phantom.

Verification of Gamma Knife Output Dose Conformity with Treatment Planning System in Terms of Red, Green, and Blue Channels Wijaya, Tabitha Ivana; Irhas, Irhas; Soediatmoko, Elia; Manik, Josua Timotius
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.22506

The calibration method using Gafchromic EBT-3 film is employed to verify the conformity of the Gamma Knife output dose compared to the Treatment Planning System (TPS). The films undergo exposure to doses of 5, 10, 15, 20, and 25 Gy on a phantom, followed by data processing and analysis using ImageJ, MatLab, and Microsoft Excel software. Assessment of the red, green, and blue channels is carried out to evaluate their sensitivity and conformity with the TPS doses. The film calibration curve shows that the red channel has the highest sensitivity among the other two channels, as indicated by the corresponding increase between dose and net Optical Density (OD). Calculation of the gamma index using Dose Difference (DD) and Distance to Agreement (DTA) values at 3% and 2.4 mm were used to determine the conformity of the film dose with TPS using the Gamma Passing Rate (GPR). The red, green, and blue channels obtained GPR values of 98.96%, 98.61%, and 98.27%, respectively. This result validates that the red channel achieved the highest percentage of conformity between film and TPS doses. However, the GPR values of the three channels have no significant difference. It is concluded that the red, green, and blue channels have a high percentage of conformity between the film dose and the TPS dose.

Evaluation of 6 MV photon beam characteristics on Varian Clinac iX: a Monte Carlo study Manik, Josua Timotius; Okselia, Anisza; Junios, Junios; Margaretha, Angelica; Haryanto, Freddy
International Journal of Advances in Applied Sciences Vol 14, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v14.i1.pp227-234

This work aims to study the characteristics of photon beams through phase space file (PSF) analysis using Monte Carlo (MC) simulation. 6 MV photon beams from the Varian Clinac iX were simulated using PRIMO software. The beam parameters were validated by evaluating the percentage depth dose and dose profile. A full PSF was scored at the downstream end of the linear accelerator (LINAC) upper and lower parts and analyzed to determine the beam fluence profile, energy fluence profile, angular distribution, and spectral distribution. The results show that within PSF 1, the photon beam has an average scattering angle of 10.74° and a mean energy of 1.18 MeV. In PSF 2, the average scattering angle decreases to 2.63° while the mean energy increases to 1.50 MeV. The field size variation at 20×20, 30×30, and 40×40 cm2 affects both the angular and spectral distribution of the photon beam. The photon beam in PSF 2 exhibits an average scattering angle of 4.56, 6.31, and 6.66°, with corresponding mean energy values of 1.40, 1.32, and 1.30 MeV, respectively. These findings show that as the field size increases, the photon beam scatters at a larger angle while the energy decreases.

Validation of Varian Clinac iX Model on 6 MV Photon Beam Using Fast Monte Carlo Simulation Manik, Josua Timotius; Okselia, Anisza; Gaspersz, Daniel Gibbor; Haryanto, Freddy
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 9 No. 4 (2023): December
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v9i4.27075

Monte Carlo (MC) is widely recognized as the most accurate method for dosimetry analysis in radiotherapy due to its precision. However, successful MC dose calculation hinges upon the validation of the linac model employed in simulations. This study aims to verify the PRIMO model of the Varian Clinac iX and to determine the optimal initial electron energy. The comparison of one-dimensional dose distribution between simulations and measurements serves as the foundation for assessment. The Varian Clinac iX on 6 MV photon beam was meticulously modeled with the initial electron energies spanned from 5.2 to 5.8 MeV in increments of 0.2 MeV. The dose calculation were performed for a field size of 10 cm × 10 cm and a source-to-surface distance (SSD) of 100 cm. The Dose Planning Method (DPM) was adopted as the simulation engine for expedited MC simulation. A number of particle histories–approximately 4.0 × 108–were simulated, resulting in the generation of around 109 particles from the linac head. The investigation revealed that an initial electron energy of 5.8 MeV achieves good agreement with measurement by attaining the smallest difference in percentage depth dose (PDD) of about 0.98%. The lateral dose deviation of approximately 4.63% serves to validate the precision of the secondary collimator design. Additionally, a comparative analysis of DPM and PENELOPE for dose calculation was conducted. In contrast to the PENELOPE, the DPM speeds up simulation time by approximately 3.5 times, reduced statistical uncertainties to 0.59% and afford better accuracy in dose calculation. The result underscore the suitability of the PRIMO model for MC simulation for dose calculation, given its robust agreement with the measurements.

ANALISIS PENGARUH KETIDAKHOMOGENAN FANTOM TERHADAP DISTRIBUSI DOSIS ELEKTRON MENGGUNAKAN SIMULASI MONTE CARLO Gaspersz, Daniel Gibbor; Manik, Josua Timotius
Karst: Jurnal Pendidikan Fisika dan Terapannya Vol 7 No 2 (2024): Karst : Jurnal Pendidikan Fisika dan Terapannya
Publisher : Program Studi Pendidikan Fisika FKIP Universitas Muslim Maros

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46918/karst.v7i2.2241

The usage of homogeneous phantom in the calibration of LINAC is the standard in radiotherapy. However, a homogeneous phantom cannot accurately represent the complexity of the human body. This study was conducted to perform a Monte Carlo simulation of electron beam irradiation on an inhomogeneous phantom and then compare the resulting dose distribution values, in the form of PDD, with the PDD values obtained from a homogeneous phantom. Irradiation was performed with a 6.6 MeV electron beam on an inhomogeneous phantom resembling the human body. It was discovered that there is a significant difference between the R100 and R50 values of the inhomogeneous phantom in comparison to the homogeneous water phantom. The R100 value of the inhomogeneous value differs by 53.33% compared to the homogeneous phantom, while the R50 value differs by 41.07%. This indicates the influence of electron beam interaction with the inhomogeneous phantom on the resulting dose distribution. In the PDD curve, it is observed that the electron beam passing through the inhomogeneous medium experiences a greater loss of kinetic energy compared to the homogeneous medium. It was found that there’ a significant difference between the PDD values generated in the inhomogeneous phantom compared to the homogeneous phantom.

Biological Half-Life of Technetium-99m Ethambutol in Tuberculosis Patients: A Whole-Body Scan Perspective Sinaga, Morgan Hanny Griselda; Harade, Ryo Rachman; Manik, Josua Timotius
Jurnal Fisika Vol. 14 No. 1 (2024): Jurnal Fisika 14 (1) 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

The development of an etambutol radiopharmaceutical kit by PTNBR Batan aims to enhance the specificity of Mycobacterium Tuberculosis (MTb) imaging, the causative agent of tuberculosis. This research evaluates the distribution and biological half-life of Technetium-99m Etambutol radiopharmaceutical in the lungs, right kidney, left kidney, and bladder. This information is crucial for understanding the radiopharmaceutical's distribution within the body and improving the interpretation of whole-body etambutol scan results. The region of interest (ROI) technique was employed to delineate the areas of interest in the anterior and posterior images. The study sample consisted of 12 patients suspected of TB, with 5 females and 7 males aged 24 to 75 years. The results demonstrated that technetium-99m etambutol was distributed throughout the body with primary excretion routes through urine and feces. The highest activity was observed in the lungs, indicating the presence of tuberculosis infection. The longest biological half-life of technetium-99m etambutol was recorded in the left kidney (5.74 ± 1.42 hours) with a decay constant of 0.242 hour-1 and the right kidney (5.10 ± 1.89 hours) with a decay constant of 0.269 hour-1.

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