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Proceedings Paper

Evaluation of dual-energy radiography with a digital x-ray detector
Author(s): Regis Guillemaud; Christine Robert-Coutant; Michel Darboux; Jean Jacques Gagelin; Jean-Marc Dinten
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Paper Abstract

Dual-energy imaging has been proposed as a method for producing material-specific images, thus permitting separate examination of bone and soft-tissue structures. Interesting clinical results, particularly for chest, have been presented usually for screen-film or phosphor plate detectors and with single exposure. The purpose of the paper is to investigate double exposure dual-energy with a digital X-Ray detector. The study is performed with a CCD-based large field digital X-Ray detector (Paladio detector, Apelem) installed on a remote table. Dual exposure is feasible on this detector with little registration problem because we have a very short delay (< 0.5 s) between two acquisitions. For each examination, two radiographs are acquired at two different high and low energies and with adapted X-ray tube filtrations. X-ray generator energy voltages and filtrations are optimized in order to obtain thin energy peak spectra with good spectral separation (50 keV), much better than with single exposure systems. Tissue decomposition images are estimated from both acquisitions. The decomposition process is helped by the nice spectral separation. Scatter correction, applied to the raw dual-exposure acquisitions, provides an improvement of tissue decomposition. Results are shown for a chest phantom.

Paper Details

Date Published: 28 June 2001
PDF: 10 pages
Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430946
Show Author Affiliations
Regis Guillemaud, CEA-LETI (France)
Christine Robert-Coutant, CEA-LETI (France)
Michel Darboux, CEA-LETI (France)
Jean Jacques Gagelin, CEA-LETI (France)
Jean-Marc Dinten, CEA-LETI (France)

Published in SPIE Proceedings Vol. 4320:
Medical Imaging 2001: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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