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All Journal JFA (Jurnal Fisika dan Aplikasinya)
Prayitno, Audiena Gelung
Department of Physics, Institut Teknologi Sepuluh Nopember (ITS)
Physics

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Optimization of Low-Dose Pediatric Chest CT Examination: Pediatric Phantom Study Miftahuddin, Dafa; Prayitno, Audiena Gelung; Hariyanto, Aditya Prayugo; Pontjowijono, Djuli; Endarko, Endarko
Jurnal Fisika dan Aplikasinya Vol 20, No 1 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i1.19814

Abstract

This study uses a Pediatric Thoracic phantom developed in-house to optimize low-dose pediatric chest CT examinations based on organ-specific dose and image quality. Four low-dose protocols, low kV and low mA, reconstructed using Filtered Back Projection (FBP) and iterative reconstruction (IR) algorithms, were investigated. Lung, heart, and spinal cord doses were measured using calibrated Gafchromic LD-V1 Film. Evaluation of image spatial resolution and noise are considered. The CTDIvol results underestimate organ-specific doses. Low kV exposed an average dose of 29.55% less than low mA. No significant differences existed in the MTF curves of standard, low mA, or low kV doses. The peak NPS for low kV is significantly higher than for low mA. The combination of low kV and FBP produces images with better high spatial resolution. Meanwhile, combining low mA with an IR algorithm effectively reduces image noise so that low-contrast object detection improves.
Image Quality Assessment of In-House Phantom for Pediatric Computed Tomography Prayitno, Audiena Gelung; Miftahuddin, Dafa; Hariyanto, Aditya Prayugo; Gani, Muhammad Roslan Abdul; Endarko, Endarko
Jurnal Fisika dan Aplikasinya Vol 21, No 2 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.20434

Abstract

The study aimed to determine the estimated low dose and image quality of the in-house pediatric phantoms using the 128 slice CT-Scan. This study used in house pediatric phantoms (7 year). Twelve artificial cylinder targets were fabricated with diameters 3, 5, 8, and 10 mm, and CT densities -+100, -400, -750 HU. The image quality was performed using CT-Scan 128 slice (GE) with parameters of helical scanning using a low dose and standard dose and using 80 and 120 kV. For Signal noise to ratio (SNR), Contrast to Noise Ratio (CNR) were also investigated. Volumetric CT dose index (CTDIvol), Size‐Specific Dose Estimates (SSDE). The effective value of the diameter for 7-year-old was 20.15 cm. According to the study, the amount of radiation exposure measured as SSDE for in-house pediatric phantoms was found to be 3.71 mGy for low dose and 6.09 for standard dose. For image quality analysis, the low-dose CT protocol has a detection sensitivity of 100% for targets measuring > 5mm in diameter.  
Co-Authors Djuli Pontjowijono Endarko Endarko Gani, Muhammad Roslan Abdul Hariyanto, Aditya Prayugo Miftahuddin, Dafa