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All Journal Buletin Udayana Mengabdi Jurnal Biologi Udayana Bumi Lestari BERKALA FISIKA Jurnal Keselamatan Radiasi dan Lingkungan Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Physical Review Kappa Journal
Gusti Ngurah Sutapa
Program Studi Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Udayana
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 Laju Dosis Radiasi Neutron Pada Pekerja Radiasi Menggunakan Surveymeter di Instalasi Radioterapi Ida Bagus Putu Priastana Bawa; Ni Nyoman Ratini; Wayan Balik Sudarsana; Gusti Ngurah Sutapa; I Made Satriya Wibawa; I Gde Antha Kasmawan; Rozi Irhas
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.27296

Abstract

The research was carried out at the Radiotherapy Installation at Hospital Prof. Dr. I.G.N.G. Work with the aim of knowing the value of the neutron radiation dose rate at the maximum point after the irradiation is carried out and knowing the value of the neutron radiation dose rate to radiation workers based on the Dose Limit Value permitted by BAPETEN. The research was carried out by measuring the neutron radiation dose rate using a neutron surveymeter at 7 different points with a photon beam of 10 MV energy. At point A, the average value of the neutron radiation dose rate at the maximum point was 6618.87 ± 959.50 µSv/h, at point B it was 1586.99 ± 113.95 µSv/h, at point C it was 1599.90 ± 210.98 µSv/h, at point D it is 1236.83±113.94 µSv/h, at point E it is 297.48±41.79 µSv/h, at point F it is 23.69±3.14 µSv/h h and at point G of 0.54 ± 0.44 µSv/h. Then the value of the equivalent dose rate of neutron radiation at each point is obtained, namely, at point A it is 1.8 µSv/h, at point B 3.2 µSv/h, at point C 3.5 µSv/h, at point D 2 .3 µSv/h, at point E 2.3 µSv/h, at point F 2 µSv/h and at point G 1.9 µSv/h, then the equivalent dose rate value is compared with 1/2 NBD of radiation workers of 5 µSv /h, then the equivalent dose rate value is still below 1/2 of the NBD of radiation workers and the SPO that applies at the Radiotherapy Installation at Hospital Prof. Dr. I.G.N.G. Ngoerah is indeed safe for radiation workers.
Studi Dosis Radiasi Berkas Foton Energi 6 MV dan 10 MV Terhadap Nilai HI dan CI pada Kasus Kanker Serviks Menggunakan Teknik Intensity Modulated Radiation Therapy (IMRT): - Sutapa, Gusti Ngurah; I Wayan Suarya; Wayan Balik Sudarsana; Ida Bagus Made Suryatika; Made Sumadiyasa; I Gusti Agung Widagda
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.27385

Abstract

Penelitian ini menganalisis distribusi dosis radiasi foton 6 MV dan 10 MV pada pasien kanker serviks menggunakan teknik Intensity Modulated Radiation Therapy (IMRT). Tujuan penelitian adalah untuk mengevaluasi keseragaman dosis dan kecocokan dosis pada Planning Target Volume (PTV) dengan menggunakan Homogeneity Index (HI) dan Conformity Index (CI). Sampel penelitian terdiri dari 10 pasien kanker serviks yang dirawat di RSUP Prof. I G. N. G. Ngoerah Denpasar. Dosis yang diterima pasien dianalisis menggunakan Dose Volume Histogram (DVH) untuk masing-masing energi foton. Hasil menunjukkan bahwa rata-rata HI untuk energi 6 MV adalah 0,0817 dan untuk 10 MV adalah 0,0803, sementara CI untuk 6 MV dan 10 MV masing-masing adalah 0,9556 dan 0,9701. Nilai HI dan CI yang dihasilkan sesuai dengan standar ICRU Report 83, yang menunjukkan distribusi dosis yang seragam dan efektif pada PTV. Temuan ini mengindikasikan bahwa kedua energi foton dapat memberikan distribusi dosis yang optimal, dan pemilihan energi dapat disesuaikan dengan kebutuhan klinis tanpa mengurangi kualitas terapi.
Menentukan Potensi Resiko Kanker pada Pemeriksaan CT Scan Toraks dengan Metode SSED Sutapa, Gusti Ngurah; Ni Putu Aprillia Artanti Phalosa; I Wayan Balik Sudarsana; Ni Nyoman Ratini; I Made Yuliara; I Wayan Supardi
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.27804

Abstract

This study aims to determine the potential risk of thoracic organ cancer in CT Scan examinations using the Size-Specific Effective Dose (SSED) method, considering the importance of accurate radiation dose measurement to minimize the risk of cancer due to radiation exposure. The analysis was conducted on 30 female patients and 30 male patients in the adult category (17 - 45 years) at the Radiology Installation of Prof. Dr. I G. N. G. Ngoerah Hospital, Denpasar, using a descriptive quantitative approach with secondary data. The results showed that the Size-Specific Dose Estimate (SSDE) and SSED values ​​in female patients were 6.51 ± 0.70 mGy and 2.95 ± 0.48 mSv, respectively, while in male patients they were 6.38 ± 0.49 mGy and 2.27 ± 0.26 mSv. The risk of cancer in female patients is estimated at 0.016% and in male patients it is 0.012%. The Anova test showed a significant difference between the dose values ​​of the SSDE and SSED methods, which was caused by SSED only considering the dose of organs covered in the CT Scan image. However, the t-test showed that the doses from both methods did not exceed the BAPETEN standard No. 8 of 2011, so that the thoracic CT Scan examination in this Installation is safe and feasible to use.  
The Effect of Focus Film Distance Variation on Patient Absorbed Dose in Thorax Examination with Roentgen Machine in Radiology Installation of Sanjiwani Hospital Gianyar I Nyoman Yosua; Gusti Ngurah Sutapa; I Ketut Putra; Ida Bagus Suryatika; Hery Suyanto; Ida Bagus Alit Paramarta
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.28113

Abstract

A study has been conducted on the effect of Focus Film Distance (FFD) variation on patient absorbed dose during thorax examination at the Radiology Installation of Sanjiwani Hospital, Gianyar. This study aims to determine the effect of FFD variation and the suitability of the radiation dose received by patients whether it is still within the limits of BAPETEN's decision. The X-ray machine used was Siemens Luminos Fusion Roentgen with the FFD variation method given a distance of 110 cm, 130 cm, and 150 cm in 30 patients. Dose measurements were carried out based on radiation exposure and analyzed according to BAPETEN standards. The results showed that the greater the FFD value, the smaller the absorbed dose received by patients. The highest absorbed dose obtained for FFD 110 cm was 0.3867 mGy, 130 cm was 0.2769 mGy, and 150 cm was 0.2079 mGy below the maximum limit of 0.4 mGy set by BAPETEN, so it is safe for patients. Statistical analysis of one-way t-test showed significant results, with thitung < ttabel. This indicates that FFD variation affects the absorbed dose, and all doses remain within safe limits. Thus, thorax examination at RSUD Sanjiwani Gianyar has met the established safety standards.
Measurement of Natural and Artificial Radiation as Well as Radiation Applications in The Field of Medical Physics at SMA Negeri II Kuta Badung Bali Sutapa, Gusti Ngurah; I Gde Antha Kasmawan; Ida Bagus Made Suryatika; I Made Yuliara; Ni Nyoman Ratini; I Gusti Agung Ayu Ratnawati; Ni Luh Putu Trisnawati; I Ketut Putra; Ni Kadek Nova Anggarani
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.28254

Abstract

The results of research that have been carried out, especially in the field of medical physics such as X-rays, have been widely utilized in the medical field, especially Radiology Units in Several General and Regional Hospitals. Thus, it is very important to be understood and known by the community, especially the community, in this case the students of SMA Negeri 2 Kuta. In 2022/2023, there are 507 male and 597 female students. Seeing these conditions, surveys and observations were carried out as a result, students had difficulty understanding physics because the physics subject matter was dense, memorized and mathematical. Seeing these results, it is necessary to carry out a new paradigm in physics learning. One of the more appropriate methods is to balance theory learning with field applications such as natural and artificial radiation measurements and applications in the field of medical physics. The results of natural radiation measurements in the classroom and outside the classroom were 0.605 ± 0.0024 and 0.182 ± 0.0008 mSv/year, respectively. The limit of the dosage rate allowed by BAPETEN is 1,000 mSv/year. Natural radiation identified in the classroom and outside the classroom is still declared safe
Pengaruh Focus Film Distance (FFD) terhadap Nilai Uji Kolimasi pada Kolimator Pesawat Sinar-X Stasioner untuk Pemeriksaan Pasien Marcellino, Nathaniel; Ratini, Ni Nyoman; Balik Sudarsana, I Wayan; Sutapa, Gusti Ngurah; Paramarta, I. B. Alit; Kasmawan, I. G. Antha
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.28903

Abstract

A study has been conducted on the effect of Focus Film Distance (FFD) on the collimation test values of stationary X-ray unit collimators for patient examinations. This research aims to determine the extent to which FFD affects collimation test values. The FFD variations used were 90 cm, 95 cm, 100 cm, 105 cm, 110 cm, 115 cm, and 120 cm. There are three tests in the collimation test: illumination test, collimation field discrepancy with X-ray beam, and X-ray beam perpendicularity. The illumination test was conducted using a lux meter, which was then averaged per FFD. The resulting illumination values corresponding to the FFD variations were 425.25 lux, 381.55 lux, 343.90 lux, 311.80 lux, 283.50 lux, 259.45 lux, and 238.20 lux. These results conform to the inverse square law. For the collimation field discrepancy values |dX| and |dY|, corresponding to the FFD variations, the values were 0.68 and 0.62; 0.32 and 0.34; 0.02 and 0.02; 0.10 and 0.08; 0.18 and 0.20; 0.34 and 0.32; 0.48 and 0.50, respectively. The X-ray beam perpendicularity value remained constant for all FFD variations at 1.03º. The values obtained from the three tests comply with the Indonesian Ministry of Health Regulation No. 1250/MENKES/SK/XII/2009 concerning Quality Control Guidelines for Radiodiagnostic Equipment.
Pengaruh Variasi Arus Tabung (mA) Terhadap Kualitas Citra Pada Pesawat Computed Tomography (CT) Scan di RSUD Bali Mandara Sintiya Biantari, I Dewa Ayu; Sutapa, Gusti Ngurah; Alit Paramarta, Ida Bagus; Sandi, I Nengah; Suardana, Putu; Tri Suandayani, Ni Komang; Setiawan, Hendra
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29378

Abstract

Computed Tomography (CT) Scan is one of the essential diagnostic tools in the medical field. CT scan image quality is represented by the Signal-to-Noise Ratio (SNR) and Contrast-to-Noise Ratio (CNR). This study was conducted to understand the effect of tube current variation on image quality in CT scan examinations. The CT scan parameters were set at an X-ray tube voltage of 120 kV, an exposure time of 1 second, and tube current variations of 100 mA, 200 mA, 300 mA, 400 mA, and 500 mA. From 25 image data obtained from scanning the Tos phantom on the CT scan, data were collected on the average signal intensity of the material, the average signal intensity of the background, and the standard deviation of the background signal intensity obtained from the Region of Interest (ROI) readings on each scanned phantom image. The Pearson correlation test results between tube current and SNR values showed that the Pearson correlation coefficient for polypropylene, nylon, acrylic, delrin, and air were 0.993, 0.992, 0.993, 0.992, and 0.992, respectively. The linear regression correlation coefficient (r) for polypropylene, nylon, acrylic, delrin, and air were also 0.993, 0.992, 0.993, 0.992, and 0.992, respectively. Similarly, the Pearson correlation test results between tube current and CNR values showed that the Pearson correlation coefficient for polypropylene, nylon, acrylic, delrin, and air were 0.992, 0.992, 0.993, 0.992, and 0.992, respectively. The linear regression correlation coefficient (r) for polypropylene, nylon, acrylic, delrin, and air were also 0.992, 0.992, 0.993, 0.992, and 0.992, respectively. These results indicate that for all phantom materials, the tube current value has a strong positive correlation with both SNR and CNR. The SNR and CNR values increase linearly with increasing tube current, suggesting that a higher tube current can improve CT scan image quality.  
Analysis of Radiation Dose Received by Radiation Workers With Physical and Biological Dosimeters in The Radiology Unit of Sanjiwani Hospital Mas Janudinata, Gde Ari; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Made Suryatika, Ida Bagus; Artawan, I Nengah; Trisnawati, Ni Luh Putu
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29539

Abstract

This study aims to evaluate the impact of radiation exposure on the health of radiation workers at RSUD Sanjiwani Gianyar over the past five years. The evaluation was conducted through a physical approach, measuring radiation doses using Thermoluminescent Dosimeter (TLD), and a biological approach by analyzing the total leukocyte count and its components, namely neutrophils, lymphocytes, monocytes, and eosinophils. The results showed that the highest radiation dose was received by radiology specialists at 0.921 mSv, followed by medical physicists at 0.905 mSv, and radiographers at 0.894 mSv. This variation reflects differences in radiation exposure levels based on each profession's tasks and positions. Leukocyte and component analysis indicated that all values were within normal ranges. Although statistical tests showed significant differences in neutrophil levels between professions, overall radiation doses and leukocyte levels were within the safe limits set by PERKA BAPETEN No. 4 of 2013. The findings underline that radiation protection measures at RSUD Sanjiwani have been effective in minimizing health risks from radiation exposure. However, regular dose monitoring and health evaluations are necessary to ensure long-term protection for radiation workers.  
Analisis Variasi Gantry Terhadap Distribusi Dosis Radiasi Kanker Otak Dengan Teknik Intensity Modulated Radiation Therapy (IMRT) Dali Sinaga, Ade Nisa; Sutapa, Gusti Ngurah; Amelia, Cory; Made Suryatika, Ida Bagus; Yuliara, Made; Antha Kasmawan, I Gde; Irhas, Rozi
Kappa Journal Vol 9 No 1 (2025): April
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.
Optimasi Slice Thickness dengan Nilai Signal to Noise Ratio dan Contrast to Noise Ratio untuk Meningkatkan Kualitas Citra MRI Genu Anastasia Victor, Agnes Maria Salvi; Sutapa, Gusti Ngurah; Gunawan, A. A. Ngurah; Sandi, I Nengah; Rupiasih, Ni Nyoman; Simpen, I Nengah
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29591

Abstract

Research has been conducted on the effect of slice thickness variation on the quality of Genu MRI images. This study was conducted at the Radiology Installation of Bali Mandara Hospital using primary data from Genu MRI examination results.The independent variable in this study is the variation of slice thickness values of 3, 5, and 7 mm. There were 30 patientsmeasured and the tissues analyzed were ligament, bone, fat, and noise as background using the ROI method and the segmentation results wereresults were taken at the mean value and standard deviation in the background. The difference in SNR and CNR values due to variations in slice thickness values can be tested using the Factorial Anova test. The results of this study obtained that there is an effect of slice thickness variation on SNR and CNR values that will have an impact on the quality of MRI Genu images. The greater the slice thickness value analyzed, the greater the SNR and CNR values produced and the better the image quality. In ligament tissue, the average SNR values of 3, 5 and 7 mm are 23.830; 36.594; and 50.524, respectively. In bone tissue, 191.352; 277.399, and 344.170 were obtained. In fat tissue, SNRs of 9,460, 292,022, and 367,463 were obtained. Changing the slice thickness will directly affect the SNR. It can be seen that the higher the slice thickness value given, the higher the SNR and CNR values for each tissue evaluated and the longer the scanning time required. In the slice thickness variation.
Co-Authors A. A. Ngurah Gunawan Alit Paramarta, Ida Bagus Anandika Putra, I Made Raditya Anastasia Victor, Agnes Maria Salvi Arsana Karang, Ade Rama Ditya Artawan, I Nengah Aulia Nur Aisah Ayu Ratnawati, I Gusti Agung Balik Sudarsana Balik Sudarsana, I Wayan Baskoro, Winardi Tjahyo Br Ginting, Venesia Sesilia Choirul Anam AM Diponegoro Cory Amelia Dali Sinaga, Ade Nisa Dharma Negara, I Putu Surya Djarwani Soejoko Eka Saputra Elshaday S.B Siregar Farah Sukmana Gunawan, A. A. Ngurah Hanzani, Asril Hendra Setiawan Hery Suyanto Huki, Pascalia Agno Marina I G. A. Widagda I Gde Antha Asmawan I Gde Antha Asmawan I Gde Antha Kasmawan I Gusti Agung Ayu Ratnawati I Gusti Agung Ayu Ratnawati I Gusti Agung Ngurah Ari Kusuma Putra I Ketut Putra I Ketut putra, I Ketut I Made Hendra Hadinata I Made Yuliara I Made Yuliara I Nengah Sandi I Nengah Simpen I Nyoman Yosua I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Putu Sutirta Yasa I Wayan Suarya I Wayan Supardi I. M. Yuliara I. M. Yuliara I.M. Yuliara Ida Ayu Putu Aristia Hutami Ida Bagus Alit Paramarta Ida Bagus Alit Paramarta Ida Bagus Alit Paramartha Ida Bagus Made Suryatika Ida Bagus Made Suryatika Ida Bagus Putra Manuaba Ida Bagus Putu Priastana Bawa Ida Bagus Suryatika Irhas, Rozi Kadek Miniati Kadek Sumaja Kadek Yuda Astina Kasmawan, I. G. Antha Komang Ngurah Suarbawa M. Zully Amrul Hadi Made Sumadiyasa Made Suryatika, Ida Bagus Maghfirottul Iffah Marcellino, Nathaniel Mas Janudinata, Gde Ari Mberato, Anastasia Jessing Gamalita Mega Wahyu N. L. P. Trisnawati Nabilla Fatimah NEVIATY PUTRI ZAMANI Ni Kadek Ayu Asari Dewi Ni Kadek Nova Anggarani Ni Kadek Nova Anggarani Ni Komang Tri Suandayani Ni Komang Tri Suandayani Ni Luh Putu Trisnawati NI LUH WIDYASARI Ni Made Purmita Sari Ni Nyoman Rupiasih Ni Nyoman, Ratini Ni Putu Aprillia Artanti Phalosa Ni Putu Pande Anita Yulianti Ni Putu Winiayu Veramika Ni Putu Yuni Nurmalasari Ni Wayan Ekayani Nurfaizah Nurfaizah Nurmalasari, Ni Putu Yuni Nyoman Wendri Paramarta, I. B. Alit Paranditayana, I Nyoman Poniman, S. Prameswari, Else Putri Ayu Pramitha, Ni Luh Emy Pranditayana, I Nyoman Prawistya Putra, I Made Gede Mas Prayuda, I Made Ardi Putra Adnyana, I Gusti Agung Putu Gede Agus Krisna Yogantara Ramadan Purnama, Muhammad Mada Retianingsih Oeta Ulan Romadhon Ilham Imani Rozi Irhas Rozi Irhas Rozi Irhas Rozi Irhas Rozy Irhaz Sanjaya Natadiredja Sari, Kamelin Diah Satriya Wibawa, I Made Setiono, Made Budi Silalahi, Johanes J. Sintiya Biantari, I Dewa Ayu Suandayani, Ni Komang Tri Sudarsan, I Wayan Balik Sudarsana, I Wayan Balik Sudarsana, Wayan Balik Sukarasa, I Ketut Sylvia Ariska Susanti Titik Purwanti Tri Suandayani, Ni Komang Trisnawati, Ni Luh Putu Wayan Balik Sudarsana Wayan Balik Sudarsana Widiana, I Komang Widianingsih, Ni Kadek Indah Widya Karulina Imanda Muhamad Winardi Tjahyo Baskoro Winer Johan Bora Yohana Dian Savitri Yuli Asri Yuliara, I Made Yuliara, Made