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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 Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics Other

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Analisis Dosis Efektif pada Pemeriksaan Computer Tomography (CT) Scan Abdomen di RSU Bali Jimbaran Farah Sukmana; Gusti Ngurah Sutapa; I Gde Antha Asmawan; Rozy Irhaz
Kappa Journal Vol 6 No 2 (2022): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v6i2.6115

Abstract

Telah dilakukan analisis dosis efektif dalam pemeriksaan CT Scan abdomen di RSU Bali Jimbaran. Penelitian dilakukan dengan menggunakan data sekunder hasil pemeriksaan CT Scan abdomen seperti nilai CTDIVol, DLP, arus, tegangan dan panjang scan. Data dikelompokkan berdasarkan jenis kelamin yakni 25 orang pasien laki laki dan 25 orang pasien perempuan. Nilai dosis efektif didapatkan dari hasil kali nilai DLP dengan faktor konversi (k). Analisis dosis efektif dilakukan menggunakan nilai DRL standar peraturan Kepala Bapeten dan ICRP 102. Dari hasil perhitungan diperoleh dosis efektif pada pasien laki laki sebesar 5,8707±0,80 mSv sedangkan pada pasien perempuan sebesar 5,5261±1,08 mSv. Nilai-nilai dosis tersebut masih sesuai dengan standar yang ditetapkan oleh Bapeten dan ICRP sehingga pesawat CT Scan tersebut masih layak digunakan untuk pemeriksaan CT Scan abdomen
Estimasi Dosis Radiasi Sinar-X Terhadap Efek Herediter Pada Radiografi Konvensional Sylvia Ariska Susanti; Gusti Ngurah Sutapa; Maghfirottul Iffah
Kappa Journal Vol 6 No 2 (2022): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v6i2.6467

Abstract

A study has been carried out on the estimation of X-ray dose on hereditary effects on conventional radiography. The research was conducted at the Bali Academy of Radiodiagnostic and Radiotherapy Engineering using a Raysafe X-Ray Multimeter. Secondary data was obtained in the form of results of checking the output voltage (kV), exposure time (ms) and exposure (mGy). The data obtained are then grouped according to the voltage used. The data is used to calculate the Entrance Surface Dose (ESD) value, which is then used to find the value of the Hereditary effect on the examination of each organ. In this study, the lowest ESD value was found at the use of a voltage of 40 kV, namely 0.3737 mGy, while the highest ESD value was at the use of a voltage of 80 kV, which was 0.7328 mGy. Based on the calculation of hereditary effects for generation I has the highest probability compared to generation II, this is very dependent on the ability of cells after exposure to radiation. Cells in general can make natural repairs. The longer the time after exposure to radiation, the more cells have the opportunity to repair the effects of radiation. So the probability of the risk of hereditary effects in generation II will be smaller.
Analisis Pengaruh Field of View (FOV) Terhadap Kualitas Citra Pesawat CT Scan di RSU Bali Jimbaran Widya Karulina Imanda Muhamad; Gusti Ngurah Sutapa; I Gde Antha Asmawan; Rozi Irhas
Kappa Journal Vol 6 No 2 (2022): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v6i2.6116

Abstract

It has been investigated the effect of field of view (FOV) on image quality produced by a CT Scan using the noise uniformity method with a phantom head. The FOV variations used are 180, 200, 220, 240 and 260 mm. The exposure time current and tube voltage used are 220 mAs and 130 kV, while the scan length and slice thickness used were 40 mm and 3 mm. Analysis of the effect of FOV variation on noise uniformity is determined by the standard deviation value obtained when performing ROI. Based on the standard deviation value, which shows that FOV variation affects the noise uniformity value, where the large increase in FOV, the noise uniformity is getting smaller and the resulting image quality is getting better
Analisis Sebaran Debu Vulkanik Erupsi Gunung Kelud Berdasarkan Pergerakan Angin di Wilayah Jawa (Studi Kasus Erupsi Gunung Kelud 13 Februari 2014) Romadhon Ilham Imani; I Ketut Sukarasa; Kadek Sumaja; Komang Ngurah Suarbawa; Ida Bagus Alit Paramartha; Ngurah Sutapa
BULETIN FISIKA Vol 24 No 2 (2023): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2023.V24.i02.p11

Abstract

The distribution of volcanic ash from the eruption of Mount Kelud on 13 February 2014 had a significant impact on atmospheric conditions in the Java Island region. This research was conducted to identify the trajectory of volcanic dust, the mass value of the particles, and the range of distribution in the atmosphere which is affected by wind conditions. The influence of the wind is based on wind direction and speed by doing wind streamline modelling. Furthermore, the assistance of volcanic ash distribution was carried out using the Red, Green, Blue (RGB) composite image method, and the particle mass and distribution range of volcanic dust was carried out using hysplit modelling. The atmospheric layer analysed at the flight level area at 16 altitudes, namely at an altitude of 1.5-16.1 km. From the results of the analysis, it was found that the maximum wind speed is 38 m/s, which is at an altitude of 16.1 km. The trajectory of the distribution of volcanic ash heads to the Northeast and then most of it turns to the Southwest due to wind direction and speed. The highest maximum particle mass value is at an altitude of 16.1 km, which is 580,000 mg/m2 with a particle distribution range of 2,600 km from the position of Mount Kelud.
Pengaruh Multi Leaf Collimator (MLC) Terhadap Besar Dosis Yang Diterima Bagian Kepala Pasien Kanker Otak Pascalia Agno Marina Huki; Gusti Ngurah Sutapa; I Wayan Balik Sudarsana
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 I Gusti Agung Ayu Ratnawati; I Ketut Putra; Ida Bagus Made Suryatika; Gusti Ngurah Sutapa; Ni Luh Putu Trisnawati
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 Eka Saputra; Gusti Ngurah Sutapa; I Nyoman Paranditayana
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 Venesia Sesilia Br Ginting; Gusti Ngurah Sutapa; I Gusti Agung Ayu Ratnawati; I Komang Widiana
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 Muhammad Mada Ramadan Purnama; Gusti Ngurah Sutapa; I Nyoman Pranditayana
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.
The Effect of Time Repetition Variation on Brain MRI Imaging Quality On T2 Weighted Sequences Ade Rama Ditya Arsana Karang; Gusti Ngurah Sutapa; I Putu Surya Dharma Negara
Kappa Journal Vol 8 No 1 (2024): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i1.24885

Abstract

Magnetic Resonance Imaging (MRI) is an imaging technique used to produce images of parts of the human body by utilizing a strong magnetic field. The examination that is often carried out is a brain examination. This research was conducted at Bali Mandara Hospital. To find out the condition of the brain, an MRI examination can be done. MRI can produce images known as sequences which produce T1 Weighted Image (T1WI), T2 Weighted Image (T2WI), resulting in visible images with different intensities. To obtain T2WI, the time echo (TE) and time repetition (TR) must be long to give the fat and water a chance to decay, so that the fat and water contrast can be visualized well. This research aims to determine the effect of TR variations on SNR values, and determine the best TR to produce good image values. To generate T2WI SNRs on brain MRI. This street vendor activity uses a Phillips 1.5 Tesla type MRI aircraft. Data collection was obtained from twenty patients with 3 variations of TR values starting from 3,500 ms, 5,500 ms and 7,500 ms by obtaining a total of 60 images. Evaluate tissue SNR values by measuring ROI directly on the MRI device. SNR value analysis was performed on cerebrospinal fluid (CSF) tissue, spinal cord. Sequentially the SNR values obtained were 174.24, 211.22 and 244.51 in the CSF tissue 78.53, 80.64 and 84.81 in the spinal cord tissue. This street vendor activity has shown the result that the longer the TR value is given, the SNR value will increase. This is because long TR values are able to evaluate networks in more slices and provide better noise signal values. The TR variation of 7,500 ms can produce the highest SNR value so that the resulting image is very good
Co-Authors A. A. Ngurah Gunawan Ade Rama Ditya Arsana Karang Alit Paramarta, Ida Bagus Anandika Putra, I Made Raditya Anastasia Jessing Gamalita Mberato Anastasia Victor, Agnes Maria Salvi Artawan, I Nengah Aulia Nur Aisah Ayu Ratnawati, I Gusti Agung Balik Sudarsana Balik Sudarsana, I Wayan Baskoro, Winardi Tjahyo Choirul Anam AM Diponegoro Cory Amelia Dali Sinaga, Ade Nisa Djarwani Soejoko Eka Saputra Elshaday S.B Siregar Farah Sukmana Gunawan, A. A. Ngurah Hanzani, Asril Hendra Setiawan Hery Suyanto 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 putra, I Ketut I Komang Widiana I Made Hendra Hadinata I Made Yuliara I Made Yuliara I Nengah Sandi I Nengah Simpen I Nyoman Paranditayana I Nyoman Pranditayana I Nyoman Yosua I Putu Surya Dharma Negara I Wayan Balik Sudarsana 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 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 Mega Wahyu Muhammad Mada Ramadan Purnama 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 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 Pascalia Agno Marina Huki Poniman, S. Prameswari, Else Putri Ayu Pramitha, Ni Luh Emy Pranditayana, I Nyoman Prawistya Putra, I Made Gede Mas Putra Adnyana, I Gusti Agung Putu Gede Agus Krisna Yogantara Retianingsih Oeta Ulan Romadhon Ilham Imani Rozi Irhas Rozi Irhas Rozi Irhas Rozi Irhas Rozy Irhaz Sanjaya Natadiredja Satriya Wibawa, I Made Setiono, Made Budi Silalahi, Johanes J. Sintiya Biantari, I Dewa Ayu Suandayani, Ni Komang Tri Sudarsan, I Wayan Balik Sudarsana, Wayan Balik Sukarasa, I Ketut Sylvia Ariska Susanti Titik Purwanti Tri Suandayani, Ni Komang Trisnawati, Ni Luh Putu Venesia Sesilia Br Ginting Wayan Balik Sudarsana Wayan Balik Sudarsana Widya Karulina Imanda Muhamad Winardi Tjahyo Baskoro Winer Johan Bora Yohana Dian Savitri Yuli Asri Yuliara, I Made Yuliara, Made