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Robert Janssen Stevenly
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Journal : Jurnal Inotera

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Analisis Variasi Sudut Wedge pada Treatment Planning System Berdasarkan Dose Volume Histogram (DVH) pada Ca Mammae Sinistra Nurjannah, Sri; Robert Janssen Stevenly; Kadek Subagiada; Erlinda Ratnasari Putri
Jurnal Inotera Vol. 9 No. 2 (2024): July - December 2024
Publisher : LPPM Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31572/inotera.Vol9.Iss2.2024.ID352

Abstract

Breast cancer ranks first in terms of the highest number of cancers in Indonesia and is one of the first contributors to cancer deaths. According to IARC, radiotherapy is one of the most important modalities in the treatment of breast cancer. Radiotherapy is a type of treatment that uses ionizing radiation to kill cancer cells without damaging surrounding healthy tissue. To obtain an even or homogeneous dose distribution on an uneven skin surface, a wedge is used so that the radiation given to the tumor area is truly optimal and the surrounding healthy tissue receives a minimum dose. This research was carried out by evaluating the Planning Target Volume (PTV) value based on ICRU-83 and dose distribution in Organs at Risk (OAR) based on QUANTEC standards at four different wedge angles, namely 15°, 30°, 45°, and 60°, used the 3D-CRT technique of tangential radiation with a dose of 50 Gy in 25 fractions on 5 left-sided breast cancer patients. The research results showed that the average Homogeneity Index (HI) values for the 15°, 30°, 45° and 60° wedges were 0.286, 0.346, 0.436 and 0.578, respectively. In the left and right lung dose distribution, the results obtained for the 15°, 30°, 45°, and 60° wedge were respectively 2231.4 and 116.2 cGy, 2257.8 and 114.6 cGy, 2141 and 100 cGy, and 2059.4 and 88.8 cGy. For the average dose distribution to the heart, the values obtained at the 15°, 30°, 45°, and 60° wedges were 2005.6 cGy, 2040.4 cGy, 1930.6 cGy, and 1844.4 cGy, respectively. where the average dose received by OAR is still below the limit allowed by QUANTEC. Using a wedge angle of 15° provides a homogeneous dose distribution for the PTV and a wedge angle of 60° provides the lowest dose distribution for the OAR.
Comparison of Photon Dose Distribution in Breast Cancer Using 3DCRT and Half Beam Techniques Yusrani, Nurrohimawati; Robert Janssen Stevenly; Rahmawati Munir; Erlinda Ratnasari Putri
Jurnal Inotera Vol. 9 No. 2 (2024): July - December 2024
Publisher : LPPM Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31572/inotera.Vol9.Iss2.2024.ID359

Abstract

Radiotherapy planning can be done with 3D Conformal Radiotherapy (3DCRT) and Half Beam. The success of radiotherapy planning is considered by comparing the isodose curve, Dose Volume Histogram (DVH), Organs At Risk (OAR), Homogeneity Index (HI), and Conformity Index (CI) obtained by the 3DCRT and Half Beam techniques. This study used data from 5 patients at the Radiotherapy Installation at A.W. Hospital. Sjahranie Samarinda with radiation planning of 5000 cGy (25×2 Gy) for breast cancer. The two radiation plans used gantry angles of 310˚ and 120˚. The calculated dose distribution value can be seen through the 90%, 95% PTV dose, and OAR absorbed dose. PTV doses of 90% and 95% in the 3DCRT technique covered the target well. The radiation dose values of the 3DCRT technique at PTV 90% were around 4860 cGy – 4930 cGy and PTV 95% were around 4750 cGy – 4840 cGy. Meanwhile, the Half Beam technique could not cover the target well. It was because the radiation dose values received by the Half Beam technique at 90% PTV were around 780 cGy – 4860 cGy and 95% PTV were around 2210 cGy – 5020 cGy. The OAR absorbed doses values for the 3DCRT and Half Beam techniques were still within the safe limits of tolerance according to QUANTEC. Meanwhile, the HI and CI values in the 3DCRT technique were closer to the rules of ICRU Report 83 of 2010 compared to the Half Beam technique. Therefore, from the values that have been obtained, the success rate of the radiotherapy planning process after measurements is shown in the 3DCRT technique. It has the value of more efficient dose calculations and can be used as a reference in optimizing dose distribution to patients.
The Use of 3D-CRT Technique in dose Distribution Analysis for Cervical Cancer Treatment Planning An Nisa Octavia; Devina R. P. S. P; Robert Janssen Stevenly; Ave Kurnia Sari
Jurnal Inotera Vol. 10 No. 1 (2025): January-June 2025
Publisher : LPPM Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31572/inotera.Vol10.Iss1.2025.ID353

Abstract

Three Dimensional Conformal Radiotherapy (3D-CRT) is a technique used in designing a cancer treatment (treatment planning system) using radiation emitted through a gantry with direction, angle, number of fields, and radiation energy according to needs. Determination of direction, angle, number of fields, and radiation energy precisely aims to provide effectiveness in cancer treatment. The purpose of this study was to determine the efficient use of multiple gantry angles in cervical cancer using a LINAC machine with 3D-CRT technique. Data processing in this study was carried out using quantitative analysis techniques, namely descriptive statistics. This analysis technique uses secondary data obtained from the results of the description that has been carried out by doctors at the Radiotherapy Installation. Data processing was carried out by carrying out a treatment planning system on 7 patients with each patient receiving planning using 4 gantry angles and 6 gantry angles. These results are visualized in the form of tables and graphs of absorbed doses received by patients. Based on this study, it can be concluded that using the 3D-CRT technique in cases of cervical cancer, using 4 gantry angles is more efficient than using 6 gantry angles.
Co-Authors An Nisa Octavia Ave Kurnia Sari Devina R. P. S. P Erlinda Ratnasari Putri Kadek Subagiada Munir, Rahmawati Nurjannah, Sri Yusrani, Nurrohimawati