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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Syntax Literate: Jurnal Ilmiah Indonesia
Jaya, I Putu Wesa Angga
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences Other

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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.
Comparison of Dose Distribution with Graphical Optimization and Inverse Planning Techniques in Cervical Cancer Brachytherapy Ratini, Ni Nyoman; Jaya, I Putu Wesa Angga; Sutapa, Gusti Ngurah; Indrayana, I Putu Tedy; Nurmalasari, Ni Putu Yuni; Sudarsana, I Wayan Balik
Jurnal Penelitian Pendidikan IPA Vol 12 No 2 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i2.12900

Abstract

Cervical cancer is the leading cause of death among women in Indonesia, with 36,964 new cases reported in 2022. Brachytherapy is a key component in treating advanced-stage cervical cancer, where dose optimization is critical to maximize the target dose (HRCTV) and minimize exposure to organs at risk. Graphical Optimization (GrO) and Inverse Planning (IP) techniques are commonly used, but comparative studies using Co-60 sources remain limited. Previous studies have largely used Ir‑192, so this study explores the comparison of GrO versus IP using Co‑60, which has not been widely studied in Indonesia. Co‑60 was chosen because it provides a dose distribution comparable to Ir‑192, has a longer half‑life reducing the frequency of source replacements and maintenance costs and has been reported to shorten patient treatment time by approximately 10%. This study compared the dose distribution of both techniques in 30 brachytherapy patients treated with a Co-60 source at Prof. Dr. I.G.N.G. Ngoerah Hospital. Data were analyzed using the Sagiplan 2.2.1 Treatment Planning System (TPS) following the TG-43 protocol. Evaluations included D90 HRCTV, COIN, DHI, bladder D2cc, and rectum D2cc based on ICRU Report 89 recommendations. MANOVA results (SPSS 29.0; significance < 0.05) showed that GrO’s D90 HRCTV (7.239 Gy ± 0.134 Gy) was significantly higher (sig = 0.006) than IP (7.155 Gy ± 0.093 Gy). GrO’s DHI (0.352 ± 0.043) was also superior (sig = 0.030), while COIN, bladder D2cc, and rectum D2cc showed no significant differences. Overall dose distribution for GrO differed significantly from IP (p = 0.011), though all parameters met ICRU standards. Conclusion: GrO excels in target coverage and homogeneity, while IP is equivalent in OAR protection. Both techniques are dosimetrically feasible, but GrO is more adaptive for complex anatomies despite requiring longer planning time.
Co-Authors Gusti Ngurah Sutapa I Putu Tedy Indrayana Irhas, Rozi Ni Kadek Nova Anggarani Ni Nyoman, Ratini Nurmalasari, Ni Putu Yuni Sudarsana, I Wayan Balik