Study of the relationship between radiation dose and image quality in computed tomography (CT)

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dc.contributor.authorSTOUTAH ,Youssera
dc.contributor.authorAbdelhak ,Fekrache
dc.date.accessioned2026-11-05T12:34:32Z
dc.date.available2026-11-05T12:34:32Z
dc.date.issued2026
dc.description.abstractThe increasing use of computed tomography (CT) has raised growing concerns about balancing radiation dose reduction with the preservation of diagnostic image quality. This challenge is addressed through the As Low As Reasonably Achievable (ALARA) principle, which advocates minimizing radiation exposure while maintaining sufficient image quality for accurate diagnosis and patient safety. This study aimed to investigate the relationship between radiation dose and image quality in thoraco-abdomino-pelvic computed tomography (TAP CT) examinations performed during the portal venous phase. In addition, the effects of demographic and technical factors, including age, sex, and tube current-time product (mAs), on radiation dose and image quality were evaluated. The study was conducted at the Central Radiology Department of Ibn Rochd University Hospital, Annaba, Algeria, using a SCENARIA View Whole Body X-ray CT System (FUJIFILM Corporation, Japan). A total of 12 patients (6 males and 6 females) who underwent TAP CT examinations were included. Radiation dose was assessed using the Computed Tomography Dose Index volume (CTDIvol) and Dose-Length Product (DLP), while objective image quality was evaluated using Noise, Signal-to-Noise Ratio (SNR), and Contrast-to-Noise Ratio (CNR). CTDIvol values ranged from 6.4 to 8.9 mGy, whereas DLP values ranged from 486.4 to 677.7 mGy·cm. Linear regression analysis showed a weak association between age and radiation dose, with coefficients of determination (R²) of 0.1403 for males and 0.1468 for females, indicating that age explained only a small proportion of the variability in radiation dose within the study population. In contrast, a strong positive correlation was observed between mAs and CTDIvol, with R² = 0.9135 for males and R² = 0.9879 for females, confirming the expected increase in radiation dose with increasing tube current-time product. The relationship between radiation dose and image quality varied according to the evaluated metric. For Noise, the coefficients of determination were 0.8769 in males and 0.2639 in females. For SNR, the corresponding values were 0.5911 and 0.5752, while CNR showed R² values of 0.6222 and 0.3710 for males and females, respectively. These findings suggest that image quality is influenced not only by radiation dose but also by technical acquisition parameters and patient-related characteristics. Overall, the results demonstrate that optimizing CT protocols requires consideration of multiple factors beyond radiation dose alone. Appropriate selection of acquisition parameters can improve diagnostic image quality while minimizing radiation exposure in accordance with Abstract the ALARA principle. Nevertheless, the relatively small sample size warrants further studies involving larger patient populations to strengthen the statistical power and improve the generalizability of the findings
dc.identifier.urihttp://dspace.univ-skikda.dz:4000/handle/123456789/6566
dc.language.isoen
dc.publisherFaculty of Sciences
dc.titleStudy of the relationship between radiation dose and image quality in computed tomography (CT)
dc.title.alternativeMedical Physics
dc.typeThesis
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