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Irhas, Rozi
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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.
Analisis Distribusi Dosis Radiasi terhadap Perencanaan Radioterapi Menggunakan Metode Segmentasi Citra pada Kasus Tumor Otak dengan Teknik Intensity Modulated Radiation Therapy (IMRT) Saputri, Izza Wahyu Saputri; Suryatika, Ida Bagus Made; Amelia, Cory; Sandi, I Nengah; Sumadiyasa, Made; Widagda, I Gusti Agung; 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.v9i1.29562

Abstract

A study has been conducted on the effect of the number of segments on the radiation dose distribution of photon beams in brain tumor cases using the Intensity Modulated Radiation Therapy (IMRT) technique. This study used 20 primary data and 10 secondary data from brain tumor patients with 6 MV photon beams and a total dose of 6000 cGy. Calculations were performed by analyzing the Homogeneity Index (HI) and Conformity Index (CI) values as well as the radiation dose to the Organs at Risk (OAR), followed by statistical testing. Based on the conducted research, the results showed that HI and CI values for 5, 10, and 15 segments were different. For example, the HI value for 5 segments was more homogeneous, approaching 0, and the CI value for 10 segments was closer to 1, which indicates a better match with the PTV shape. The average maximum dose distribution for OARs with 5 segments in the brainstem, chiasma, left eye, right eye, left lens, and right lens were 4541.9 cGy, 3893.8 cGy, 2754.2 cGy, 2516.1 cGy, 740.8 cGy, and 628.0 cGy, respectively. With 10 segments, the doses for these OARs were 4104.2 cGy, 3633.9 cGy, 2583.9 cGy, 3124.2 cGy, 710.5 cGy, and 625.5 cGy, respectively. With 15 segments, the doses for the same OARs were 4123.0 cGy, 3956.2 cGy, 2753.3 cGy, 2433.7 cGy, 667.7 cGy, and 547.8 cGy, respectively. All maximum dose distributions for the OARs received by the patients were still within the tolerance limits stated in the Radiation Oncology A Question-Based Review 2nd Edition.
ANALYSIS OF THE EFFECT OF THE X-RAY TUBE CURRENT ON UNIFORMITY IMAGE NOISE VALUES Mberato, Anastasya Jessning Gamalita Mberato; Ratini, Ni Nyoman; Yuliara, I Made; Irhas, Rozi
Indonesian Physical Review Vol. 6 No. 1 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i1.183

Abstract

This research aimed to evaluate the effects of the X-ray current tube on the uniformity value of CT image noise. This research used the CT images of Siemens head water phantom. The phantom was scanned with a Siemens Somatom Scope CT scanner for various current tubes (i.e., 180 mAs, 200 mAs, 220 mAs, 240 mAs, and 260 mAs) on tube voltage 110 kV, slice thickness 3 mm, and FOV 240 mm. The uniformity values in CT image noise were analyzed using the standard deviation value (SD). The SD was measured by the ROI process in 5 different locations, in the center and at 3 o'clock, 6 o'clock, 9 o'clock, and 12 o'clock on the images CT. Based on the result of a simple linear regression test using IBM SPSS ver 25, it was found that the current tube significantly affected the uniformity value of image noise (r2=0,9768, p<0,05). This result showed that increasing the current tube can reduce image noise uniformity. The highest image noise uniformity value was at a current at 180 mAs with 0,217 HU, and the lowest was at 260 mAs with 0,031 HU. This result also shows that all the values are less than 2 HU and still within the acceptable limit by the BAPETEN standard regulation.
Pengaruh Slice Thickness terhadap Signal to Noise Ratio (SNR) dari Hasil Penyinaran CT Scan di RSUP Prof. Dr. I.G.N.G Ngoerah Kusumaningsih, Lusi Putu Russita; Suryatika, I Bagus Made; Trisnawati, Ni Luh Putu; Irhas, Rozi
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.7675

Abstract

A research has been carried out on the effect of slice thickness on SNR values from the results of CT Scan irradiation at Prof. Dr. I.G.N.G Ngoerah Hospital.  Variations in the thickness of the slices used are 1 mm, 3 mm, 5 mm, and 7 mm.  The tube voltage, tube current, and FOV used are constant, namely 120 kV, 200 mA, and 380 mm.  SNR value analysis was calculated using the average object value and SD background for each material.  Based on the results of a simple linear regression test, the thickness of the slices obtained has an effect of 99.9% on the SNR value.  These results indicate that the greater the thickness of the slice used, so the SNR value will increasesas the SNR value increases, it will improve image quality.
Penentuan Dosis Efektif Pada Abdo Pelvis dan Organ Kritis dari Hasil Penyinaran Computed Tomography Scanner (CT Scan) Oktar Mahardika, I Gusi Putu Gede; Suryatika, Ida Bagus Made; Putra, I Ketut; Irhas, Rozi
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.7676

Abstract

Determination of the effective dose on the abdo pelvis and organs at risk has been carried out from the results of the CT Scan irradiation at Sanglah General Hospital.The study began by collecting secondary data from the results of an abdominal CT scan, namely the CTDIvol and DLP values. Then the data was grouped based on gender of 40 patients with an age range of 20-70 years. The value of the effective dose in the abdo pelvis is obtained by multiplying the DLP value and the conversion coefficient k. While the effective dose to organs at risk is obtained from the product of the CTDIvol and wt. The results of the effective dose in the abdo pelvis were obtained in the range of 4.596-6.738 mSv for male patients while for female patients it was 4.209-5.232 mSv. The results of the effective dose in the abdo pelvis are still at the threshold set by BAPETEN, which is 13.275 mSv, so the CT scan is still suitable for use. Average effective dose values for critical organs were 0.2882 mSv for the liver, 0.8646 mSv for the kidney, and 0.5764 mSv for the gonad. The highest dose was received by the gonads. This shows that the gonads are the organs that have the highest sensitivity in receiving radiation doses in the abdo pelvis
Efek Variasi Arus Waktu Terhadap Dosis Efektif Radiasi Lensa Mata Pada Penggunaan Bismuth Shielding Pada CT-Scan Kepala Sihaloho, Monika Lestari; Sandi, Nengah; Bunawas, Bunawas; Irhas, Rozi
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.v7i1.15995

Abstract

A study has been carried out to determine the effect of time current variation on the effective dose of eye lens radiation on head CT scans. The aim of this study was to determine the effect of changing the flow of time on the effective dose of eye lens radiation and to determine the reduction in the effective dose of eye lens radiation when using bismuth shielding. The tools used are CT-scan, head mannequin, thermoliminescence dosimeter (TLD) calcium sulfate CaSO4;Dy, and bismuth shielding. The method used in this study uses the calculation of the effective dose of the 100 kV calibration curve from NuclindoLab and the equivalent dose. The measurement results show an average of each current of 31.540 mSv 100 mAs 43.947 mSv 150 mSv 59.808 msv 200 mAs 64.747 mSv 250 mAs, 137.083 mSv 300 mAs without bismuth and using bismuth 26.883 mSv 100 mAs 100 mAs, 27.847 mSv 27.84 mSv 200 mAs, 50.430 mSv 250 mAs, 81.334 mSv 300 mAs. Based on the results obtained, it is known that the effective dose obtained in the eye lens without bismuth is 67.42 ± 39.41 mSv and using bismuth is 48.85 ± 22.43 mSv with a dose reduction of 27%. As for efforts to reduce the dose received, it must be done by paying attention to the parameter settings on the CT-Scan examination such as voltage, current, slice thinkness, pitch and the use of protective equipment such as bismuth shielding.
Conformity Test of Reference Air Kerma Rate (RAKR) for Brachytherapy Device in Radiotherapy Sub-Installations of Central General Hospital Prof. Dr. I.G.N.G. Ngoerah Jaya, I Putu Wesa Angga; Ratini, Ni Nyoman; Anggarani, Ni Kadek Nova; Irhas, Rozi
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i5.58184

Abstract

Brachytherapy requires accurate dosimetry to ensure patient safety and treatment efficacy. The Reference Air Kerma Rate (RAKR) is a key parameter in the Treatment Planning System (TPS) that quantifies the strength of radioactive sources. This study aims to evaluate the conformity between RAKR values certified by the manufacturer and those measured using a Well-Type Ionisation Chamber at the Radiotherapy Sub-Installation of Central General Hospital Prof. Dr. I.G.N.G. Ngoerah. Measurements were conducted from December 2023 to March 2024 using a SAGINOVA/ECKERT ZIEGLER brachytherapy unit. The RAKR values were obtained through electrometer readings, adjusted for air density, and compared to the manufacturer’s certification using established equations. The results were assessed using the ±3% tolerance threshold set by AAPM Report No. 46 (1994). The measured RAKR values consistently showed negative deviations from the certified values: -1.96 %, -2.69 %, -2.53 %, and -2.42 %, all within the acceptable ±3% limit. This supports the conformity and operational integrity of the device. These findings confirm that short-term RAKR measurements at the hospital align with certification values, ensuring reliable dose delivery for brachytherapy. Future research should investigate long-term calibration stability and the impact of environmental factors to refine quality assurance protocols.
Co-Authors Bunawas Bunawas Cory Amelia Dali Sinaga, Ade Nisa Gusti Ngurah Sutapa I Gde Antha Kasmawan I Ketut putra, I Ketut I Nengah Sandi Ida Bagus Made Suryatika Jaya, I Putu Wesa Angga Kusumaningsih, Lusi Putu Russita Made Sumadiyasa Made Suryatika, Ida Bagus Mberato, Anastasya Jessning Gamalita Mberato Ni Kadek Nova Anggarani Ni Nyoman, Ratini Oktar Mahardika, I Gusi Putu Gede Sandi, Nengah Saputri, Izza Wahyu Saputri Sihaloho, Monika Lestari Suryatika, I Bagus Made Trisnawati, Ni Luh Putu Widagda, I Gusti Agung Yuliara, I Made Yuliara, Made