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Ni Nyoman, Ratini
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 Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences Other

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Pengaruh Focus Film Distance (FFD) terhadap Nilai Uji Kolimasi pada Kolimator Pesawat Sinar-X Stasioner untuk Pemeriksaan Pasien Nathaniel Marcellino; Ni Nyoman Ratini; I Wayan Balik Sudarsana; Gusti Ngurah Sutapa; I. B. Alit Paramarta; I. G. Antha Kasmawan
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.v9i1.28903

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.
Distribution of Radiation Doses Received by Organs at Risk in Cervical Cancer Using Intracavitary Brachytherapy Technique I Made Raditya Anandika Putra; Gusti Ngurah Sutapa; I Gde Antha Kasmawan; Ni Nyoman Ratini; I Made Satriya Wibawa; I Ketut Putra
Kappa Journal Vol 9 No 2 (2025): Kappa Journal
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.
Analisis Dosis Serap pada Pemeriksaan Thorax Pasien Anak dengan Pesawat Sinar-X di Instalasi Radiologi RSUD Sanjiwani Gianyar Ema Vinesia Br Barus; Ni Nyoman Ratini; Ni Luh Putu Trisnawati; I Nengah Sandi; Nyoman Wendri; Ida Bagus Alit Paramarta
Kappa Journal Vol 9 No 2 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.30101

Abstract

Telah dilakukan penelitian mengenai analisis dosis serap pada pemeriksaan thorax pasien anak dengan pesawat sinar-X di Instalasi Radiologi RSUD Sanjiwani Gianyar. Penelitian ini bertujuan untuk menganalisis dosis serap yang diterima oleh pasien anak pada pemeriksaan thorax serta membandingkannya dengan batas dosis yang direkomendasikan oleh United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). Penelitian ini dilakukan dengan metode kuantitatif menggunakan data sekunder dari hasil pemeriksaan thorax pasien anak berusia 1-15 tahun yang meliputi faktor eksposi (tegangan tabung, kuat arus, dan waktu eksposi). Data ini yang kemudian digunakan untuk menghitung dosis paparan dan dosis serap. Analisis statistik dilakukan dengan uji Kruskall-Wallis untuk menentukan signifikansi perbedaan dosis serap di RSUD Sanjiwani Gianyar dengan dosis serap yang ditetapkan oleh UNSCEAR. Hasil penelitian menunjukkan bahwa terdapat variasi dosis serap berdasarkan kelompok usia, di mana semakin tinggi usia pasien, semakin besar dosis serap yang diterima. Didapatkan dosis serap untuk kelompok usia 1-4 tahun yaitu:  mGy untuk pasien laki-laki dan  mGy untuk pasien perempuan. Untuk kelompok usia 5-9 tahun didapatkan sebesar mGy untuk pasien laki-laki dan  mGy untuk pasien perempuan. Sedangkan dosis serap kelompok usia 10-15 didapatkan sebesar  mGy untuk pasien laki-laki dan  mGy untuk pasien perempuan. Dosis serap yang diperoleh di RSUD Sanjiwani masih berada di bawah batas dosis maksimum yang ditetapkan oleh UNSCEAR yaitu: untuk kelompok usia 1-4 tahun sebesar 0,0300 mGy, kelompok usia 5-9 tahun sebesar 0,0400 mGy, dan kelompok usia 10-15 sebesar 0,0500 mGy.
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 A. A. Ngurah Gunawan Anastasia Jessing Gamalita Mberato Buana, Muhammad Candra Else Putri Ayu Prameswari Ema Vinesia Br Barus Feriandanu Hakim Fitriyani Mus Mulyadi Girsang, Dhea Vonisa Grace Christine Djara Gusti Ngurah Sutapa Gusti Ngurah Sutapa Hery Suyanto I Gde Antha Kasmawan I Gede Erix Krisna Adi Pramartha I Gusti Agung Ayu Ratnawati I Ketut Putra I M. S. Wibawa I Made Raditya Anandika Putra I Made Yuliara I Nengah Artawan I Nengah Sandi I Putu Eka Juliantara I Putu Tedy Indrayana I Putu Tedy Indrayana I Putu Wesa Angga Jaya 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 Supardi I. B. Alit Paramarta I. G. Antha Kasmawan I. M. Yuliara I. M. Yuliara Ida Bagus Alit Paramarta Ida Bagus Made Suryatika Ida Bagus Putu Priastana Bawa Irhas, Rozi Jaya, I Putu Wesa Angga Kadek Sumaja Keintjem, Regina Gabriel Komang Ngurah Suarbawa Komang Sugiarta Made Aditya Jaya Mahardika Maghfirotul Iffah Mberato, Anastasya Jessning Gamalita Mberato N. L. P. Trisnawati Nabilla Fatimah Nathaniel Marcellino Ni Kadek Nova Anggarani Ni Komang Tri Suandayani Ni Luh Emy Pramitha Ni Luh Putu Trisnawati Ni Putu Aprillia Artanti Phalosa Ni Putu Winiayu Veramika Ni Putu Yuni Nurmalasari Ni Wayan Mega Savira Utami Nurmalasari Nurmalasari Nyoman Wendri pandu lukito Pingki Setyowati Dewi Puja Satwika Luh Gede Putu Irma Wulandari Putu Suardana Putu Tedy Indrayana Putu Wida Gunawan Rafly Rizqyta Ramadhan Rozi Irhas Satriya Wibawa, I Made Selvi Marcellia Siti Raudatul Jannah Suandayani, Ni Komang Tri Syarifuddin Syarifuddin Tjahyo Baskoro, Winardi Trisnawati, Ni Luh Putu Wahyulianti Wahyulianti Wayan Balik Sudarsana Wayan Balik Sudarsana Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto, Windarjoto Windaryoto, Windaryoto Wiwik Kurniawati Yuli Nurfadhillah Yuliara, I Made Zofi Dwi Prihatini