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CMOS detector readout electronics for an emission-transmission medical imaging system

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3 Author(s)
Heanue, J.A. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; Boser, B.E. ; Hasegawa, B.H.

We have built a prototype medical imaging system in which transmission X-ray data provide anatomical information while emission radionuclide data yield physiological information. We have developed a CMOS integrated circuit for readout of the system's high-purity germanium detector. The circuit can be operated in three different modes. The first is a slow pulse-counting mode for detection of radionuclide events at 104 cps with 1-2 keV energy resolution. Next, there is a fast pulse-counting mode for simultaneous acquisition of emission and transmission data or for acquisition of dual-energy X-ray data at 106 cps with 5-7 keV energy resolution. Finally, current mode operation allows fast acquisition of X-ray transmission data. The circuit architecture includes a common preamplifier, selectable pulse shaping stages, and a common output buffer

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Nuclear Science, IEEE Transactions on  (Volume:42 ,  Issue: 4 )