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Radiation Protection Dosimetry Advance Access published online on February 3, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci723
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SCIENTIFIC AND TECHNICAL PAPER

INVESTIGATION OF POSSIBLE METHODS FOR EQUIPMENT SELF-TESTS IN DIGITAL RADIOLOGY

J. Zoetelief 1 *, H. H. E. Idris 1, and J. T. M. Jansen 1

1 Delft University of Technology, IRI, Mekelweg 15, 2629 JB Delft, The Netherlands

* To whom correspondence should be addressed.
J. Zoetelief, E-mail: j.zoetelief{at}iri.tudelft.nl


  Abstract

Quality control in digital radiology can be time-consuming. Equipment self-tests may significantly decrease staff workload. The two most essential parameters for radiology systems are image quality and patient dose. Concerning patient dose, information on the dose-area product (DAP) values generally forms the basis for assessment of patient dose. DAP-values can be measured using a transmission ionisation chamber or calculated from equipment settings. In the present study, various image quality parameters were derived using a contrast-detail (C-D) phantom. The investigation included a computer-aided assessment of C-D images, which produced various parameters, and also parameters based upon scoring by human observers. In addition, another parameter was calculated from modulation transfer function (MTF) measurements. The automatically calculated parameters showed good correlation with human readings, although the number of X-ray systems studied is still limited. We propose a combined evaluation of DAP and automatically calculated C-D or MTF parameters for equipment self-tests.


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