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Radiation Protection Dosimetry 2005 114(1-3):294-297; doi:10.1093/rpd/nch542
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

The influence of patient thickness and imaging system on patient dose and physical image quality in digital chest imaging

Gustaf Ullman1,*, Michael Sandborg1, David R. Dance2, Roger Hunt2 and Gudrun Alm Carlsson1

1 Department of Radiation Physics, Linköping University, SE-581 85 Linköping, Sweden
2 Joint Department of Physics, The Royal Marsden NHS Trust, Fulham Road, SW3 6JJ London, UK

* Corresponding author: gusul{at}imv.liu.se

The aim of this work was to study the influence of patient thickness, tube voltage and image detector on patient dose, contrast and ideal observer signal-to-noise ratio (SNRI), for pathological details positioned at different regions in the image in posterior–anterior (PA) chest radiology. A Monte Carlo computational model was used to compute measures of physical image quality (contrast, SNRI) and patient effective dose, E. Two metastasis-like details positioned in the central right lung and right lung near the spine, respectively, were studied. The tube voltage was varied between 100 and 150 kV and the patient thickness between 20 and 28 cm. Both, a computed radiography (CR) system and a direct radiography (DR) system, were investigated. The DR system provides both lower doses and better image quality compared with the CR system. The is ~2.9 times higher for the DR system compared with the CR system.


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