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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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Radiation Dose Determination and Body Mass Index (BMI) Evaluation in Abdomen CT Scan Examination Patients Using the Size-Specific Dose Estimate (SSDE) Method Prawistya Putra, I Made Gede Mas; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Made Suryatika, Ida Bagus; Putra Adnyana, I Gusti Agung; 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.v9i1.29592

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.
Determination of Diagnostic Reference Level (DRL) in Non-Contrast and Contrast Thorax CT Scan Examinations at Bali Mandara Regional Hospital Pramitha, Ni Luh Emy; Sutapa, Gusti Ngurah; Trisnawati, Ni Luh Putu; Ratini, Ni Nyoman; Suyanto, Hery; Baskoro, Winardi Tjahyo
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.10344

Abstract

A study has been conducted to determine the Diagnostic Reference Level (DRL) in non-contrast and contrast chest CT scan examinations at Bali Mandara Hospital. The study was conducted at the Radiology Installation of Bali Mandara Hospital using dose reports from non-contrast and contrast chest CT Scan examinations with data obtained including age, gender, kV, mAs, slice thick, time rotation, Pitch, as patient information and protocols used in the examination and dose information in the form of CTDIvol and DLP. This study aims to determine the local DRL value against the national DRL value. The method used to determine the DRL value in this study is by collecting data in the form of recording and documenting the dose report of CT Scan examination patients, with the data for each examination being as many as 30. From the recorded data, the CTDIvol and DLP values are used to find the DRL value by sorting it from the smallest to the largest value and then calculating the 3rd quartile as a determinant of the local DRL. The interpolation method is also used to consider the position of the 3rd quartile so that it is at a decimal value. From the research results, the CTDIvol value for non-contrast thorax examination was 6.43 mGy, and the DLP value was 293.08 mGy.cm. Meanwhile, in contrast to the thorax examination, the CTDIvol value was 6.14 mGy, and the DLP value was 852.57 mGy.cm. Furthermore, a statistical analysis was carried out in the form of a one-way t-test using SPSS software, which was used to compare the DRL values of both CTDIvol and DLP non-contrast and contrast thorax examinations with the standard values set by BAPETEN 2021 as a reference used in Indonesia. Based on the results of the analysis with a one-way t-test, it can be seen that the DRL values for non-contrast thorax examinations (DRL CTDIvol and DLP) and contrast examinations (DRL CTDIvol) do not exceed the standards set by BAPETEN. However, in the contrast thorax CT Scan examination, the DRL DLP value exceeded the standard value set by BAPETEN, so dose optimization was needed by re-evaluating the protocol implemented at Bali Mandara Hospital.
Distribution of Radiation Doses Received by Organs at Risk in Cervical Cancer Using Intracavitary Brachytherapy Technique Anandika Putra, I Made Raditya; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Ratini, Ni Nyoman; Wibawa, I Made Satriya; Putra, I Ketut
Kappa Journal Vol 9 No 2 (2025): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.29017

Abstract

A study entitled Distribution of Radiation Doses Received by Organs at Risk in Cervical Cancer Using Intracavitary Brachytherapy Technique has been conducted. The study was conducted at the Radiotherapy Sub-Installation of Prof. Dr. I.G.N.G Ngoerah Hospital with the aim of determining the distribution of doses received by High Risk Clinical Target Volume (D2cc) and Organs at Risk (D90). Determining the distribution of doses received by High Risk Clinical Target Volume (D2cc) and Organs at Risk (D90) in cervical cancer patients is still within the recommended limits in ICRU Report 89. This study used ionizing radiation by inserting radioactive cobalt-60 using internal radiotherapy techniques, namely intracavitary brachytherapy. Before the irradiation process is carried out, there is a planning stage or Treatment Planning System (TPS). The reference for this research standard is for HRCTV of 95% -107% and for OAR bladder ≤80% rectum ≤75%. The average percentage of dose distribution received by HRCTV was 104.2% which is equivalent to 7.2 Gy which is still within the range of 95%- 107%, in the bladder it was 69.4% which is equivalent to 5.Gy which is still below the value ≤80%, and in the rectum it was 57% which is equivalent to 4.1 Gy which is still below the value ≤75%. The dose distribution value in HRCTV and OAR was still within the tolerance limit listed in the recommended value in GEC-ESTRO-ABS, and ICRU Report 89.
DETERMINATION OF HALF AND TENTH VALUE LAYER PRIMARY AND SECONDARY WALLS OF X-RAY ROOM IN BALI JIMBARAN GENERAL HOSPITAL Widianingsih, Ni Kadek Indah; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Sandi, I Nengah; Baskoro, Winardi Tjahyo; Wendri, Nyoman; Prayuda, I Made Ardi
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.250

Abstract

The research has been carried out on the HVL and TVL values ​​of the primary and secondary walls of the radiology installation radiology room at RSU Bali Jimbaran. The aims of this study were (1) to determine HVL and TVL values ​​on the primary and secondary walls in the x-ray room, (2) to determine the differences between HVL and TVL values ​​if the tube voltages are varied. In determining the HVL and TVL values, ​​the linear attenuation coefficient of the walls must be known. The linear attenuation coefficient was determined by measuring the wall thickness by using a caliper, and measuring the radiation dose rate before and after passing through the primary and secondary walls. The results of the analysis of the HVL and TVL values ​​on the primary wall were 1.668 cm and 5.540 cm, meanwhile on the secondary wall ​​were 1.915 cm and 6.362 cm. When the voltage was varied 40 kV, 50 kV, 60 kV and 70 kV, there was no difference in the HVL or TVL values. Based on the results of the analysis, the HVL and TVL values ​​on the primary and secondary walls have a significant average difference.
ESTIMATION OF RADIATION DOSE AND ORGANS AT RISK (OAR) ON ABDOMINAL CT-SCAN USING SIZE-SPECIFIC DOSE ESTIMATES (SSDE) METHOD Sari, Kamelin Diah; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Sandi, I Nengah; Artawan, I Nengah; Trisnawati, Ni Luh Putu; Widiana, I Komang
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.265

Abstract

A study has been carried out on the estimation of radiation dose and Organs at Risk (OAR) on abdominal CT-Scan examination using the SSDE method. The data used in this study were secondary data from medical records such as CTDIVol, DLP, and abdominal images of patients. This study aims to determine the size of SSDE, DE, and DEOAR and to determine whether DE is still within tolerance limits to ensure the feasibility of using CT-Scans in these installations. The SSDE value is obtained by multiplying the converted def value (f) and the CTDIVol, while the DE value is obtained by multiplying the DLP value and the conversion factor (k), finally, the DEOAR value is obtained by multiplying the CTDIVol and the organ/tissue weight factor. The results showed that the patient's average SSDE score was 12.04 ± 1.06 mGy, with a male SSDE value of 12.55 ± 1.30 mGy and a female SSDE value of 12.38 ± 2.47. While the average patient DEOAR value obtained was 7.57 ± 0.72 mGy and the patient's average DEOAR value for skin and bone surface was 0.09 ± 0.01 and red bone marrow and large intestine was 1.06 ±0.13. The DE value of this study is still below the tolerance value set by BAPETEN, which is less than 17.46 mGy.
Pengaruh Multi Leaf Collimator (MLC) Terhadap Besar Dosis Yang Diterima Bagian Kepala Pasien Kanker Otak Huki, Pascalia Agno Marina; Sutapa, Gusti Ngurah; Sudarsana, I Wayan Balik
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.6633

Abstract

Research has been conducted on the effect of Multi Leaf Collimator (MLC) on the dose received by the head of brain cancer patients at Sanglah Hospital, Denpasar. This analysis aims to determine the effect of using MLC on dosing to brain cancer patients using Cobalt 60 (Co-60) teletheraphy. The dose given at TPS was 200 cGy but after using MLC the dose was received because MLC protects healthy organs around the irradiation field. If the dose given is still within the range of -5  % and +7  %, it is still acceptable. The amount of radiation dose that can be reduced by using MLC in this study was 1,35 % for brain cases and 0,12 % for Glioblastoma cases. 
Pengaruh Sinar Ultraviolet Terhadap Jamur Aspergillus Niger Ayu Ratnawati, I Gusti Agung; Putra, I Ketut; Suryatika, Ida Bagus Made; Sutapa, Gusti Ngurah; Trisnawati, Ni Luh Putu
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.12252

Abstract

Along with the development of science and technology, some researchers try to apply knowledge to several biological systems to obtain benefits that can be used. One of them is the use of ultraviolet light to kill the fungus Aspergillus niger. In addition, ultraviolet rays are also used in various fields of the drinking water industry, food, and also for sterilizing operating rooms in hospitals. A method used in this problem is the cork borer method. Data were obtained by measuring the diameter of the inhibition zone of the Aspergillus niger fungus. The results of this study were obtained at the intensity of 12.30 lux and at a distance of 15cm, within 15 minutes of irradiation time, the maximum death of the fungus Aspergillus niger was 40.74%.
Estimasi Dosis Serap dengan Metode Size Specific Dose Estimation (SSDE) dan Risiko Radiasi pada Pemeriksaan CT-Scan Kepala di Rumah Sakit Daerah Mangusada Kabupaten Badung Saputra, Eka; Sutapa, Gusti Ngurah; Paranditayana, I Nyoman
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.12985

Abstract

CT scan -Scan Those originating from X-rays on the head are very risky considering that the tissue in the brain has a greater sensitivity to ionizing radiation when compared to other organs in the human body. Problems will then arise when the use of CT-Scan sourced from X-rays can pose a radiation risk. Based on research conducted by Mathews et al. (2013) reported that at least 680,211 patients who had performed CT-Scan, 3,150 patients were diagnosed with cancer. There is a more accurate method in estimating the dose received by patients, namely using the SSDE. The dose estimation method using SSDE considers geometric factors (body size). The purpose of this study was to see how weight, gender, and age affect SSDE, using 80 patients classified into 4 age groups (children, adults, elderly, and seniors). The results showed that the average effective dose for children was 4.065 mSv for males and 3.706 mSv for females with a significant effect of weight, sex, and age on SSDE because theFCount as big4,640    FTableof 2.215
Analisis Diagnostic Reference Level (DRL) Pasien Pada Pemeriksaan Abdomen Kontras dan Nonkontras Dengan Pesawat CT Scan Di RSUD Bali Mandara Br Ginting, Venesia Sesilia; Sutapa, Gusti Ngurah; Ratnawati, I Gusti Agung Ayu; Widiana, I Komang
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.18985

Abstract

In this study, data were obtained from 35 patients aged 27-76 years. The current used varies from 46-185 mAs and a constant tube voltage of 130 kV, with different clinical symptoms. The patient's DRL value on contrast and non-contrast abdominal examination was determined by calculating the third quartile value. On non-contrast abdominal examination, the DRL CTDIvol value was 10.62 mGy and the DLP DRL was 607.76 mGy.cm and on the non-contrast abdominal examination, the DRL CTDIvol value was 32.73 mGy and the DRL DLP value was 1825.10 mGy.cm. These results indicate that the DRL CTDI vol and DRL DLP values on contrast abdominal examination at Bali Mandara Hospital were still below the actor's limits set by BAPETEN, while on abdominal examination the DRL CTDI vol and DRL DLP values exceeded the limits set by BAPETEN. This is caused by exposure which is done three times. Therefore, it is necessary to restore both the Patient Operational Standards (SOP) and the exposure factor on an abdominal contrast CT scan at Bali Mandara Hospital.
Uji Kesesuaian Kinerja Generator dan Tabung Sinar-X pada MSCT Philips 128 Slice di Instalasi Radiologi, Rumah Sakit Daerah Mangusada Ramadan Purnama, Muhammad Mada; Sutapa, Gusti Ngurah; Pranditayana, I Nyoman
Kappa Journal Vol 7 No 3 (2023): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i3.22548

Abstract

This research aimed to determine the Compliance test of MSCT Philips 128 Slice generator and X-ray tube performance at Mangusada Hospital in accordance with the tolerance limits based on the BAPETEN Head Regulation of the Republic Indonesia Number 2 of 2022 so that it can be stated that the generator and X-ray performance is in reliable condition. In this research, Raysafe Xi CT and Raysafe Xi R/F were used to measure the output value of radiation dose, tube voltage and HVL thickness on MSCT Philips 128 Slice by carrying out four test activities, namely radiation output reproducibility test, radiation output linearity test,  test, and X-ray beam quality test. The performance test of the generator and X-ray tube has been carried out on MSCT Philips 128 Slice with obtained Coefficient of Variation (CV) value in the radiation output reproducibility test of 0.00278, Coefficient of Linearity (CL) value in the radiation output linearity test of 0.00882,   at a tube voltage of 80 kVp is 6.30280 mGy/100mAs,  at a tube voltage of 120 kVp is 19.59800 mGy/100mAs,  at a tube voltage of 130 kVp is 24.48431 mGy/100mAs, and the HVL thickness at a tube voltage of 120 kVp is 8.79 mmAl. This result show that the performance MSCT Philips 128 Slice generator and X-ray tube in reliable condition.
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