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Radiation Protection Dosimetry Advance Access published online on February 2, 2008
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm493
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

CORRELATION OF IMAGE QUALITY WITH EXPOSURE INDEX AND PROCESSING PROTOCOL IN A COMPUTED RADIOGRAPHY SYSTEM

I. A. Tsalafoutas1,*, G. A. Blastaris2, A. S. Moutsatsos3, P. S. Chios2 and E. P. Efstathopoulos3

1 Medical Physics Department, Agios Savvas Hospital, 171 Alexandras Avenue, 115 22 Athens, Greece
2 Radiology Department, Polikliniki of Olympic Village, Olympic Village, Acharnai, 136 73 Athens, Greece
3 Second Department of Radiology, Medical School, University of Athens, University General Hospital, ‘Attikon’, Rimini 1, 124 62 Athens, Greece

* Corresponding author: j_tsalas{at}hotmail.com

Received August 3, 2007, amended November 20, 2007, accepted December 6, 2007

The correlation of image quality with the exposure index (EI) and the processing protocol was investigated in a Kodak computed radiography (CR) system using clinical radiographs and a water phantom containing an aluminium and a copper stepwedge. The phantom was exposed to different dose levels and the acquired images were processed using four clinical protocols. The quality of these images was evaluated in terms of image brightness, contrast and noise. In clinical radiographs, there was no straightforward correlation of image quality with EI. In phantom images, higher EI values improved contrast and reduced noise but after a point this improvement does not justify the implied increase in patient dose. Image brightness, contrast and noise were also strongly dependent on the processing protocol. To obtain the images of satisfactory quality with the Kodak CR system, a dose slightly higher than those used in 400 relative speed screen–film systems and a processing protocol designated for the specific radiographic examination are required.


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