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Proceedings Paper

MTF compensation for digital radiography system with indirect conversion flat panel detector
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Paper Abstract

The MTF (modulation transfer function) of digital radiography systems can be enhanced in the spatial frequency domain due to their high signal to noise ratio. A Wiener filter, which requires prior estimation of the noise and signal power spectrum of the images, was used to compensate MTF of the detector and thereby optimally restore the images details. We studied the noise characteristics of two flat panel detectors with structured columnar scintillator (CsI) and granular scintillator (Gd2O2S). A noise model formulating noise transfer process was applied to estimate the noise components for the filter. Signal model was based on dose of the application. We revisited the noise and signal model that was used in previous work by Souchay et al. for mammography application [1], considering the difference in detector characteristics and the applications (extremity x-ray) that we are specifically investigating. Starting with real clinical images, we used an observer study method to measure the visually optimal parameter for the Wiener filter. A set of clinical images was used to evaluate the radiologists' preferences to compensated images against the reference images. Statistical results from three experienced radiologists ranking results show that the compensated images are preferred over the reference images.

Paper Details

Date Published: 13 March 2009
PDF: 8 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725852 (13 March 2009); doi: 10.1117/12.812471
Show Author Affiliations
Wei Zhang, GE Global Research (China)
Henri Souchay, GE Healthcare France (France)
Chao Yang, GE Global Research (China)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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