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Radiation Protection Dosimetry Advance Access published online on February 3, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci748
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Leuvens Special Issue Article

ANALYSIS OF IMAGE QUALITY IN DIGITAL CHEST IMAGING

A. De Hauwere 1 *, K. Bacher 1, P. Smeets 2, K. Verstraete 2, and H. Thierens 1

1 Department of Medical Physics and Radiation Protection, Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium
2 Department of Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium

* To whom correspondence should be addressed.
A. De Hauwere, E-mail: an.dehauwere{at}UGent.be


  Abstract

An evaluation of the image quality of an amorphous silicon flat-panel detector system and a computed radiology system compared with a screen-film system was performed by means of contrast-detail phantom images. Hard and soft copy images were evaluated. Although patient dose at clinical settings was strongly decreased with the amorphous silicon system, the low-contrast visibility with this system was still significantly better than with the screen-film system. For the computed radiology system, low-contrast visibility was comparable to the screen-film system. Best results were obtained by soft copy reading at full resolution with adaptation of contrast and brightness. Changing tube voltage (102-133 kV), or additional filtration, did not significantly affect image quality. However, low-contrast visibility improved significantly with increasing exposure. It was clearly demonstrated that, in chest imaging, the amorphous silicon system has superior imaging characteristics compared to the screen-film and the computed radiology system.


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