Article Per Year (5 Year)
p-Index From 2021 - 2026
0.23
P-Index
This Author published in this journals
All Journal BULETIN FISIKA
Syamsir Dewang
Hasanuddin University
Astronomy Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Determination of Cardiothoracic Ratio (CTR) and Image Contrast in Chest Radiographs Using Variations in Focus-Film Distance (FFD) Fickry Haikal; Sri Dewi Astuty; Sultan Hamjar; Syamsir Dewang; Bannu Bannu; Arfinna Arfinna; Ayu Hardianti Pratiwi; Ajeng Anggreny Ibrahim
BULETIN FISIKA Vol. 27 No. 2 (2026): BULETIN FISIKA
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.2026.v27.i02.p13

Abstract

Posteroanterior (PA) chest radiography is generally recommended at a focus-to-film distance (FFD) of 180 cm to minimize magnification of the cardiac silhouette, which may affect assessment of cardiomegaly. However, shorter FFDs are sometimes unavoidable because of room constraints or patient-related conditions. This study aimed to evaluate cardiothoracic ratio (CTR) values obtained at different FFDs and assess cardiac image quality using the contrast-to-noise ratio (CNR) to determine the visibility of the right and left cardiac borders. A descriptive observational study with a post-test-only design was conducted using 70 digital PA chest radiographs from male patients aged 17–22 years. The images were divided into seven FFD groups ranging from 120 to 180 cm, with 10 independent samples per group. CTR and CNR were quantitatively measured using ImageJ software. All radiographs demonstrated CTR values below 50% across the investigated FFDs, indicating no radiographic evidence of cardiomegaly. The highest mean CNR values were observed at FFDs of 140 cm (64.458), 150 cm (58.639), and 180 cm (50.758). Statistical analysis revealed no significant differences in CTR (p = 0.515) or CNR (p = 0.141) among the FFD groups. The observed fluctuations in CTR and CNR were likely attributable to inter-individual anatomical variation rather than FFD-related magnification. Differences in chest geometry and tissue attenuation, particularly variations in thoracic thickness and density, may have contributed substantially to the observed measurements. These findings suggest that, within the investigated range, FFD variations from 120 to 180 cm did not significantly affect CTR or CNR in young adult male subjects.
Analysis of Entrance Skin Exposure Values and Chest Area Dose Using Digital Radiography on a Custom ANSI Phantom Aandri; Sri Dewi Astuty; St. Hartina Anwar; Ikbal Ikbal; Syamsir Dewang; Ajeng Anggreny Ibrahim
BULETIN FISIKA Vol. 28 No. 1 (2027): BULETIN FISIKA
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.2027.v28.i01.p07

Abstract

Chest radiography is one of the most frequently performed medical imaging procedures in radiology practice due to its ability to provide diagnostic information about the lungs and thoracic organs. This study aims to analyze the Entrance Skin Exposure (ESE) and radiation dose distribution in the thoracic cavity using Digital Radiography (DR) with a fabricated ANSI chest phantom. This experimental study was conducted in the Radiology Department of Dr. Tadjuddin Chalid Hospital, Makassar. The phantom was constructed using acrylic and aluminum materials with variations of air gaps of 5, 6, and 7 cm to simulate the thoracic cavity. The collected data included ESE values on the phantom surface and radiation doses within the thoracic cavity, which were further analyzed to determine the Entrance Skin Dose (ESD) and linear attenuation coefficient. The results show that ESE and ESD values increase with higher tube voltage and phantom thickness, but decrease as the FFD increases. Furthermore, the presence of air gaps within the thoracic cavity affects the attenuation process, resulting in lower radiation doses compared to denser materials. These findings indicate that exposure parameters and thoracic cavity structure significantly influence radiation dose distribution in chest radiography examinations.
Co-Authors Aandri Ajeng Anggreny Ibrahim Arfinna Arfinna Ayu Hardianti Pratiwi Bannu Bannu Fickry Haikal Ikbal Ikbal Sri Dewi Astuty Sri Dewi Astuty Ilyas St. Hartina Anwar Sultan Hamjar