Titre du document / Document title
High resolution, direct detection X-ray imagers
Auteur(s) / Author(s)
STREET Robert A. (1) ;
READY Steve E. (1) ;
RAHN Jeffrey T. (1) ;
MULATO Marcelo (1) ;
SHAH Kanai (2) ;
BENNETT Paul R. (2) ;
PING MEI (1) ;
LU Jeng-Ping (1) ;
APTE Raj B. (1) ;
HO Jackson (1) ;
VAN SCHUYLENBERGH Koenraad (1) ;
LEMMI Francesco (1) ;
BOYCE James B. (1) ;
NYLEN Per (3) ;
SCHIEBER Michael (4) ;
HERMON Haim (4) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Xerox Palo Alto Research Center, Palo Alto, CA 94304, ETATS-UNIS
(2) RMD, Watertown, MA 02172, ETATS-UNIS
(3) Dept. of Physics University of Stockholm, SUEDE
(4) Hebrew University of Jerusalem, Jerusalem 91904, ISRAEL
Résumé / Abstract
We report on a-Si direct detection x-ray image sensors with polycrystalline PbI
2, and more recently with HgI
2. The arrays have 100 micron, pixel size and, we study those aspects of the detectors that mainly determine the DQE, such as sensitivity, effective fill factor, dark current noise, noise power spectrum, and x-ray absorption. Line spread function data show that in the PbI
2 arrays, most of the signal in the gap between pixels is collected, which is important for high DQE. The leakage current noise agrees with the expected shot noise value with only a small enhancement at high bias voltages. The noise power spectrum under x-ray exposure is reported and compared to the spatial resolution information. The MTF is close to the ideal sinc function, but is reduced by the contribution of K-fluorescence in the PbI
2 film for which we provide new experimental evidence. The role of noise power aliasing in the DQE and the effect of slight image spreading are discussed. Initial studies of HgI
2 as the photoconductor material show very promising results with high x-ray sensitivity and low leakage current.
Revue / Journal Title
SPIE proceedings series
Source / Source
Congrès
Physics of medical imaging :
(
San Diego CA, 13-15 February 2000
)
Physics of medical imaging. Conference, San Diego CA
, ETATS-UNIS
(13/02/2000)
2000
, vol. 3977, pp. 418-428[Note(s) : XIV, 704 p., ] (15 ref.)
ISBN 0-8194-3594-5 ;
Illustration : Illustration
;
Langue / Language
Anglais
Editeur / Publisher
Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, INTERNATIONAL
(1988)
(Revue)
SPIE, Bellingham WA, ETATS-UNIS
(2000)
(Monographie)
Mots-clés anglais / English Keywords
Radiography ;
Human ;
X ray ;
Particle detector ;
Silicon ;
Lead ;
Iodine ;
Polycrystal ;
Mercury ;
Performance evaluation ;
Spatial resolution ;
Absorptance ;
Signal to noise ratio ;
Photoconductor materials ;
Sensitivity ;
Leakage current ;
Radiodiagnosis ;
Medical imagery ;
Mots-clés français / French Keywords
Radiographie ;
Homme ;
Rayon X ;
Détecteur particule ;
Silicium ;
Plomb ;
Iode ;
Polycristal ;
Mercure ;
Evaluation performance ;
Résolution spatiale ;
Coefficient absorption ;
Rapport signal bruit ;
Photoconducteur ;
Sensibilité ;
Courant fuite ;
Radiodiagnostic ;
Imagerie médicale ;
Mots-clés espagnols / Spanish Keywords
Radiografía ;
Hombre ;
Rayos X ;
Detector partícula ;
Silicio ;
Plomo ;
Iodo ;
Policristal ;
Mercurio ;
Evaluación prestación ;
Resolución espacial ;
Coeficiente absorción ;
Relación señal ruido ;
Fotoconductor ;
Sensibilidad ;
Corriente escape ;
Radiodiagnóstico ;
Imageneria medical ;
Localisation / Location
INIST-CNRS, Cote INIST : 21760, 35400009200651.0430
Nº notice refdoc (ud4) : 781148
