DocumentCode :
351834
Title :
Low contrast imaging with a GaAs pixel digital detector
Author :
Amendolia, S.R. ; Bisogni, M.G. ; Bottigli, U. ; Ciocci, M.A. ; Delogu, P. ; Dipasquale, G. ; Fantacci, M.E. ; Giannelli, M. ; Maestro, P. ; Marzulli, V.M. ; Pernigotti, E. ; Rosso, V. ; Stefanini, A. ; Stumbo, S.
Author_Institution :
Dipt. di Matematica e Fisica, INFN, Pisa, Italy
Volume :
1
fYear :
1999
fDate :
1999
Firstpage :
212
Abstract :
A digital mammography system based on GaAs pixel detector has been developed by the INFN (Istituto Nazionale of Fisica Nucleare) collaboration MED46. The high atomic number makes the GaAs a very efficient material for low energy X-rays detection (10-30 keV is the typical energy range used in mammography). Low contrast details can be detected with a significant dose reduction to the patient. The system presented in this paper consists of a 4096 pixel matrix built on a 200 μm thick Semi Insulating GaAs substrate. The pixel size is 170×170 μm2 for a total active area of 1.18 cm2 . The detector is bump-bonded to a VLSI Front-End chip which implements a single-photon counting architecture. This feature allows to enhance the radiographic contrasts detection with respect to charge integrating devices. The system has been tested by using a standard mammographic tube. Images of mammographic phantoms will be presented and compared with radiographs obtained with traditional film/screen systems. Monte Carlo simulations have been also performed to evaluate the imaging capability of the system. Comparison with simulations and experimental results are shown
Keywords :
VLSI; biomedical electronics; diagnostic radiography; gallium arsenide; mammography; semiconductor counters; GaAs; GaAs pixel digital detector; Monte Carlo simulations; VLSI Front-End chip; digital mammography system; dose reduction; low contrast imaging; low energy X-rays detection; single-photon counting architecture; Collaboration; Detectors; Gallium arsenide; Insulation; Mammography; Optical imaging; Pixel; Radiography; Substrates; X-ray detection;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium, 1999. Conference Record. 1999 IEEE
Conference_Location :
Seattle, WA
ISSN :
1082-3654
Print_ISBN :
0-7803-5696-9
Type :
conf
DOI :
10.1109/NSSMIC.1999.842478
Filename :
842478
Link To Document :
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