Title :
Imaging performance of single-element CdZnTe detectors for digital radiography
Author :
Bertolucci, E. ; Chirco, P. ; Conti, M. ; Marcello, L. ; Rossi, M. ; Russo, P.
Author_Institution :
Dipt. di Sci. Fisiche, Univ. Federico II, Napoli, Italy
fDate :
6/1/1998 12:00:00 AM
Abstract :
We measured the charge collection efficiency and energy resolution at 60 keV and 122 keV for single-element Cd0.8Zn0.2Te semiconductor detectors 2×10×10 mm3, irradiated transverse to the electric field, in view of their possible use for digital radiography. Charge collection efficiency, energy resolution and charge collection time have been measured as a function of the bias voltage. The detector´s imaging performance was evaluated, using a scanning procedure, by measurements (at 60 keV) of the line spread function and edge response function of the imaging system; metallic test objects and bone tissue were imaged. Image contrast values as low as C=10% were obtained for a minimum 5:1 S.N.R
Keywords :
diagnostic radiography; semiconductor counters; 122 keV; 60 keV; Cd0.8Zn0.2Te; Cd0.8Zn0.2Te detectors; CdZnTe detectors; bias voltage; bone tissue; charge collection efficiency; charge collection time; digital radiography; edge response function; energy resolution; image contrast; line spread function; metal; Charge measurement; Current measurement; Detectors; Electric variables measurement; Energy measurement; Energy resolution; Image edge detection; Radiography; Tellurium; Zinc;
Journal_Title :
Nuclear Science, IEEE Transactions on
