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Preliminary results with a three layer linear array silicon pixel detector

Arfelli, F; Bonvicini, V; Bravin, A; Cantatore, G; Castelli, E; Dalla Palma, L; Longo, R; ... Vallazza, E; + view all (1999) Preliminary results with a three layer linear array silicon pixel detector. In: Boone, JM and Dobbins, JT, (eds.) (Proceedings) Medical Imaging 1999 Conference. (pp. pp. 817-825). SPIE-INT SOC OPTICAL ENGINEERING: BELLINGHAM, WA 98227-0010 USA.

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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 a Si strip detector irradiated in an "edge-on" geometry: the pixel dimensions are 200x300 mu m(2) To obtain a sensitive area of about 50x1 mm(2) a 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+/-10 mu m 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.

Type: Proceedings paper
Title: Preliminary results with a three layer linear array silicon pixel detector
Event: Medical Imaging 1999 Conference
Location: SAN DIEGO, CA, US
Dates: 21 February 1999 - 25 February 1999
ISBN: 0-8194-3131-1
Publisher version: http://scitation.aip.org/journals/doc/SPIEDL-home/...
Keywords: digital mammography, synchrotron radiation, single photon counting, silicon pixel detectors
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/116825
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