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Proceedings Paper

Preliminary results with a three-layer linear array silicon pixel detector
Author(s): Fulvia Arfelli; Valter Bonvicini; Alberto Bravin; Giovanni Cantatore; Edoardo Castelli; Ludovico Dalla Palma; Renata Longo; Alessandro Olivo; Silvia Pani; Paolo Poropat; Michela Prest; Alexander Rashevsky; Luigi Rigon; Giuliana Tromba; Andrea Vacchi; Erik Vallazza
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Paper Abstract

A linear array silicon pixel detector has been developed to perform digital radiology with synchrotron radiation: in this communication we present the first results obtained using a three layer prototype at the Elettra Synchrotron Radiation Facility (Trieste, Italy). High efficiency (about 85% at 20 keV) is achieved by means of an Si strip detector irradiated in an 'edge-on' geometry: the pixel dimensions are 200 X 300 micrometer2. To obtain a sensitive area of about 50 X 1 mm2 stack of three layers has been assembled. Images are obtained by means of scanning techniques and their spatial resolution is determined by the scanning step. Detectors are read-out by dedicated, low noise VLSI CMOS chips in single photon counting mode. The distance between each detector layer has been measured to be 115 plus or minus 10 micrometer and the layers are parallel within a maximum tilt angle of 0.08 degrees. Cross-talk effects were found to be always smaller than 2% of the counts of the neighboring layers. The MTF in the scan direction has been evaluated. The acquisition time needed to acquire an image of a mammographic test object is about 6 minutes. The mean glandular dose is about 30% of the dose delivered at the conventional mammographic unit for the same test object while the detail visibility is comparable. These preliminary results indicate that a large area linear array silicon pixel detector can be developed: using this detector and a monochromatic synchrotron radiation beam the delivered mean glandular dose is significantly reduced when compared to conventional mammographic examinations.

Paper Details

Date Published: 28 May 1999
PDF: 9 pages
Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349562
Show Author Affiliations
Fulvia Arfelli, Univ. of Trieste and INFN (Italy)
Valter Bonvicini, INFN (Italy)
Alberto Bravin, Societa Sincrotrone Trieste (France)
Giovanni Cantatore, Univ. of Trieste and INFN (Italy)
Edoardo Castelli, Univ. of Trieste and INFN (Italy)
Ludovico Dalla Palma, Univ. of Trieste (Italy)
Renata Longo, Univ. of Trieste and INFN (Italy)
Alessandro Olivo, Univ. of Trieste and INFN (Italy)
Silvia Pani, Univ. of Trieste and INFN (Italy)
Paolo Poropat, Univ. of Trieste and INFN (Italy)
Michela Prest, INFN (Italy)
Alexander Rashevsky, INFN (Italy)
Luigi Rigon, Societa Sincrotrone Trieste (Italy)
Giuliana Tromba, Societa Sincrotrone Trieste (Italy)
Andrea Vacchi, INFN (Italy)
Erik Vallazza, INFN (United States)

Published in SPIE Proceedings Vol. 3659:
Medical Imaging 1999: Physics of Medical Imaging
John M. Boone; James T. Dobbins III, Editor(s)

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