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Proceedings Paper

Separating the uncorrelated noise from the correlated detector noise of flat panel systems in order to quantify flat panel noise easily
Author(s): Christoph Hoeschen; Oleg Tischenko; Bernhard Renger; Kerstin Jungnickel
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Paper Abstract

One big advantage in terms of image quality of modern flat panel detector systems compared to CR systems beside the better DQE of these systems is the possibility to correct for inhomogeneities of the X-ray beam and the detector (flat field correction) as well as for bad pixels. However, the used correction methods are taking a lot of time or do not cover all possible combinations of radiation quality and exposure used for patient imaging. A method is presented to achieve these correction images very easily by using a proposed method for comparing two images. This method, which has so far been used for certain noise measurements and in some cases noise reduction, can also be used for separating correlated from uncorrelated noise by correlating in frequency sub-bands the information of two images. In this study it is proven, that the uncorrelated noise image of two expositions is very similar to the correction image gained just before the two exposures. That allows to calibrate a detector quite more often and for much more beam qualities/exposures than before to achieve a better correction and another possibility of constancy testing for flat panel detectors, because the proposed method is so sensitive that it will detect single pixel changes within the detector.

Paper Details

Date Published: 20 April 2005
PDF: 10 pages
Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); doi: 10.1117/12.595758
Show Author Affiliations
Christoph Hoeschen, GSF-National Research Ctr. for Environment and Health (Germany)
Oleg Tischenko, GSF-National Research Ctr. for Environment and Health (Germany)
Bernhard Renger, Univ. Hospital Rechts der Isar (Germany)
Kerstin Jungnickel, Univ. Hospital of the Otto-von-Guericke-Univ. (Germany)

Published in SPIE Proceedings Vol. 5745:
Medical Imaging 2005: Physics of Medical Imaging
Michael J. Flynn, Editor(s)

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