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All Journal Buletin Udayana Mengabdi Bumi Lestari Jurnal Keselamatan Radiasi dan Lingkungan Jurnal Fisika FLUX Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Physical Review Kappa Journal
I Gde Antha Kasmawan
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Udayana University, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Physics Other

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Analisis Variasi Gantry Terhadap Distribusi Dosis Radiasi Kanker Otak Dengan Teknik Intensity Modulated Radiation Therapy (IMRT) Ade Nisa Dali Sinaga; Gusti Ngurah Sutapa; Cory Amelia; Ida Bagus Made Suryatika; Made Yuliara; I Gde Antha Kasmawan; Rozi Irhas
Kappa Journal Vol 9 No 1 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29557

Abstract

Penelitian mengenai Analisis Variasi Gantry Terhadap Distribusi Dosis Radiasi Kanker Otak Dengan Teknik Intensity Modulated Radiation Therapy (IMRT). dengan tujuan, untuk mengetahui pengaruh variasi jumlah sudut gantry terhadap distribusi dosis pada kasus kanker otak berdasarkan nilai HI,CI pada target kanker serta dosis maksimum pada organ at risk (OAR) menggunakan teknik IMRT. Penelitian dilakukan dengan variasi jumlah sudut gantry 4, 5 dan 6 dengan menggunakan 30 sampel. Kemudian dilakukan analisis data dengan menggunakan uji normalitas dengan uji t satu arah. Hasil penelitian menunjukkan bahwa, distribusi dosis pada PTV dengan nilai HI dan CI untuk variasi jumlah sudut 4,5 dan 6 arah sudut gantry adalah 0,118 dan 0,986; 0,116 dan 0,975; 0,108 dan 0,974. Sedangkan distribusi dosis maksimum OAR pada variasi 4,5 dan 6 arah sudut gantry untuk brainstem 4886,55; 4921,47; 4731,23; Eye R 2676,35; 2830,16; 3123,83; Eye L 3226,19; 3268,59; 3162,92; nervus optikus R 2396,23; 2775,52; 2796,94, nervus optikus L, 2939,97; 2983,12; 2912,47; lens R 789,76; 709,76; 717,32; lens L 738,31; 775,33; 724,02; chiasma, 4153,40; 4460,04; 4020,70. Berdasarkan nilai rata-rata tidak terdapat perbedaan antara nilai hasil perhitungan distribusi dosis dengan nilai ketetapan dosis maksimum dalam Radiation Oncology A Question-Based Review. Hasil penelitin ini menunjukkan bahwa perencanaan lapangan 4 arah sudut gantry memiliki hasil distribusi PTV yang lebih baik dan waktu penyinaran yang lebih siangkat dibandingkan dengan perencanaan 5 dan 6 variasi jumlah arah sudut gantry.
Radiation Dose Determination and Body Mass Index (BMI) Evaluation in Abdomen CT Scan Examination Patients Using the Size-Specific Dose Estimate (SSDE) Method I Made Gede Mas Prawistya Putra; Gusti Ngurah Sutapa; I Gde Antha Kasmawan; Ida Bagus Made Suryatika; I Gusti Agung Putra Adnyana; I Nengah Simpen
Kappa Journal Vol 9 No 1 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29592

Abstract

A study has been conducted on determining radiation doses and evaluating body mass index (BMI) in patients undergoing CT-Scan Abdomen examinations using the Size Specific Dose Estimate Method at the Bali Mandara Radiology Installation. One of the factors that influences the radiation dose received by patients is the Body Mass Index (BMI). The Size Specific Dose Estimate (SSDE) method is used to assess radiation doses based on patient size, which is often associated with BMI. This study aims to determine the estimated radiation dose of each patient and evaluate the relationship between BMI and the dose received. This study used a CT-Scan brand SIEMENS SOMATOM PERSPECTIVE (serial number 78068). The population in this study were patients undergoing CT-Scan Abdomen examinations. The sample consisted of several BMI categories, namely thin, normal, overweight, and obese. The analysis was carried out using linear regression to measure the relationship between BMI and SSDE, as well as a one-way t-test to see the difference in the average SSDE value in each BMI category. The results showed that each increase in one BMI category caused an increase in SSDE values ​​of 1,566 mGy. The R² value of 98.56% indicated that the BMI category explained almost all of the variability in SSDE values. However, a one-way t-test statistic showed that there was no significant difference in the average SSDE values ​​in the thin, normal, overweight, and obese categories (F count <F table, so H₀ was accepted). This study showed that patients with higher BMI tended to receive higher radiation doses, but the differences between categories were not statistically significant.
Uji Kesesuaian Alat Proteksi Radiasi Berdasarkan Nilai Exposure Index (EI) di Rumah Sakit Bali Mandara Chasbas Putra Tamba; Gusti Ngurah Sutapa; Ketut Putra; Nengah Sandi; I Wayan Gede Suharta; I Gde Antha Kasmawan
Kappa Journal Vol 10 No 1 (2026): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v10i1.31760

Abstract

A study has been conducted on the suitability test of radiation protection equipment based on the Exposure Index (EI) at Bali Mandara Hospital. The data used in this study are primary data obtained by conducting X-ray irradiation on PPE, namely Apron, Gonad Shield, thyroid Shield, gloves, and glasses using an X-ray machine. Then the irradiation results are processed using a CR system machine to obtain EI values using variations in tube voltage of 80 Kv, 100 Kv, 130 Kv, and a time current of 18 mAs. From the results of the analysis that has been carried out, the average EI value was obtained with a tube voltage of 80 kV for Apron 1004.60 ± 1.72, gonad shield 1302.80 ± 1.94, Thyroid shield 1444.60 ± 1.63, glasses 1375.40 ± 1.72, gloves 1478.60 ± 0.93, for a tube voltage of 100 kV the EI value for the apron was 1511.20 ± 1.24, gonad shield 1697.80 ± 1.65, thyroid shield 1810.60 ± 1.57, glasses 1598.60 ± 1.33, gloves 1819.40 ± 0.75, for a tube voltage of 130 kV 1831.00±1.41, gonad shield 2090.60±1.21, thyroid shield 2129.00±2.00, glasses 2980.20±1.07, gloves 2114.00±1.41. The EI value obtained using 80 kV tube voltage is still within the limits set by PERKA BAPETEN No.8 of 2011, namely 1300-1800
Variasi Parameter Filed of View (FoV) terhadap Nilai Signal to Noise Ratio (SNR) Dan Contras to Noise Ratio (CNR) pada Pemeriksaan Lumbal Dengan Potongan Axial Zofi Dwi Prihatini; Ni Nyoman Ratini; I Putu Tedy Indrayana; Gusti Ngurah Sutapa; I Wayan Supardi; I Gde Antha Kasmawan
Kappa Journal Vol 9 No 3 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i3.33351

Abstract

Magnetic Resonance Imaging (MRI) is widely used to evaluate spinal pathology, with image quality strongly influenced by acquisition parameters such as the Field of View (FOV). This study investigates the effect of small FOV adjustments on the Signal-to-Noise Ratio (SNR) and Contrast-to-Noise Ratio (CNR) in axial T2-weighted Fast Spin Echo (FSE) lumbar spine MRI. This study offers one of the quantitative evaluations of clinically realistic FOV variations, addressing a gap between routine protocol adjustments and evidence-based image quality optimization. This experimental study prospectively examined thirty patients undergoing routine lumbar spine MRI using a Philips Ingenia CX 1.5T system. Axial T2-weighted FSE images were acquired with three FOV settings (170 mm × 170 mm, 190 mm × 190 mm, and 210 mm × 210 mm), while all other imaging parameters were kept constant. Image quality was assessed by measuring mean signal intensities in standardized regions of interest (ROIs) placed in the intervertebral disc, cerebrospinal fluid (CSF), and surrounding fat tissue, from which SNR and CNR were calculated and statistically compared across FOV settings. The results showed increasing trends in SNR and CNR with larger FOV values; however, these differences were not statistically significant (p > 0.05), indicating that small FOV enlargements produce minimal voxel size changes and negligible effects on image quality. Clinically, these findings suggest that minor FOV adjustments can be safely applied to accommodate patient anatomy or positioning without compromising image quality, while larger FOV changes are required to achieve meaningful improvements in SNR and CNR.
Co-Authors Ade Nisa Dali Sinaga Adnyana, I Gusti Agung Putra Anastasia Jessing Gamalita Mberato Artawan, I Nengah Chasbas Putra Tamba Cory Amelia Djoko Hadi Prajitno Efrensiana Ana Melti Gde Ari Mas Janudinata Gracia Paula Fahik Gusti Ngurah Sutapa Hadi Apriandi I G. A. Widagda I Gusti Agung Ayu Ratnawati I Gusti Agung Ngurah Ari Kusuma Putra I Ketut Putra I Ketut putra, I Ketut I Made Gede Mas Prawistya Putra I Made Raditya Anandika Putra I Made Satriya Wibawa I Nengah Artawan I Nengah Artawan I Nengah Sandi I Nengah Sandi I Nengah Simpen I Nyoman Pranditayana I NYOMAN WIJAYA I Putu Dedy Pratama I Putu Tedy Indrayana I Putu Wahyu Pranata Kusuma Jaya I Wayan Gede Suharta I Wayan Supardi I. M. Yuliara I. M. Yuliara I.M. Yuliara Ida Ayu Dwi Giriantari Ida Bagus Made Suryatika Ida Bagus Putu Priastana Bawa Johanes J. Silalahi Kelo, Febriyanti Jia Ketut Putra M. Zully Amrul Hadi Made Sumadiyasa Made Yuliara Murzid, Jihan Qothrunada N. L. P. Trisnawati Nengah Sandi Ni Kadek Nova Anggarani Ni Luh Putu Trisnawati Ni Made Wedayani Ni Nyoman Rupiasih Ni Nyoman, Ratini Ni Putu Yuni Nurmalasari Nurmalasari, Ni Putu Yuni Nyoman Wendri Prayuda, I Made Ardi Rosvita Hilbrida Sulastri Rozi Irhas Rozi Irhas Sari, Kamelin Diah Satriya Wibawa, I Made Setiawan, Yohanes Agus Silalahi, Dio Carpry Gunawan Siti Masitah Spardi, I Wayan Suandayani, Ni Komang Tri Sukarasa, I Ketut Sutapa Gusti Ngurah Tjahyo Baskoro, Winardi Trisnawati, Ni Luh Putu Umi Hariyani Wayan Balik Sudarsana Wayan Gede Suharta Widiana, I Komang Widianingsih, Ni Kadek Indah Winardi Tjahjo Baskoro Windaryoto Windaryoto Winer Johan Bora Yuliara, I Made Zofi Dwi Prihatini