A single photon counting X-ray imaging system, with possible applications to dual energy mammography and angiography, is presented. A silicon microstrip detector with 100 mm pitch strips is coupled to RX64 ASICs, each of them including 64 channels of preamplifier, shaper, discriminator and scaler. The system has low noise, good spatial resolution and high counting rate capability. Results on en...

APPARATUS: Continuum Minilite 10 Hz pulsed YAG laser (355 nm), YAG laser goggles, quartz sample tubes, phototransistor trigger, Instruments SA H20 Monochrometer, Rutgers P1100 Monochrometer Driver (scanning motor and control box), Hamamatsu R928 photomultiplier, high voltage power supply, Stanford Research Systems (SRS) Fast Preamplifier model SR240, SRS Gated Integrator and Boxcar Averager mod...