Author/Authors :
Iwata، نويسنده , , Koji and Hasegawa، نويسنده , , Bruce H. and Heanue، نويسنده , , Joseph A. and Bennett، نويسنده , , Paul R. and Shah، نويسنده , , Kanai S. and Boles، نويسنده , , Colby D. and Boser، نويسنده , , Bernhard E. Splechtna، نويسنده ,
Abstract :
A medical imaging system providing both X-ray transmission and radionuclide measurements would allow correlation of structural and functional information. We therefore are evaluating a pixellated CdZnTe detector for combined X-ray computed tomography (CT) and single photon emission computed tomography (SPECT) imaging. Gamma-ray spectra of 57Co measured using NIM electronics (2 μs shaping time) and multichannel fast photon-counting electronics (50 ns shaping time) produced energy resolutions of 6.5 keV FWHM and 17 keV FWHM, respectively, at 122 keV. Fast photon-counting electronics achieved linear X-ray count-rate response up to 4×105 cps in comparison to 1.5×108 cps achieved with digital readout electronics based on a variable rate ΣΔ ADC in current mode. Results suggest that the CdZnTe detector is capable of performing both X-ray CT and SPECT with the fast photon-counting electronics, and X-ray CT in current mode with the digital readout electronics.
Keywords :
CdZnTe detector , X-ray CT , ?-ray spectrum , SPECT , Dual mode imaging , Digital readout electronics
