We present the development of a 512-channel module for high count rate digital X-ray imaging systems with silicon strip detectors. This module has been characterized for noise and matching performance having in mind possible future applications like dual energy mammography and angiography. To obtain good detection efficiency at the relevant energies (10-50 keV) the module works edge-on with strips oriented parallel to the incoming X-ray beam. We have used silicon microstrip detectors cut at 60 and 20 μm from the active area. The readout ASIC consists of 64 analog front-end channels, 2x64 counters, an input-output block, a command decoder, digital to analog converters and a calibration circuit. Each analog channel contains a charge sensitive amplifier, a shaper with peaking time of 160 ns, two independent discriminators and two independent 20-bit counters. The 512-Channel module presented in this paper is a good candidate to build imaging systems based on dual energy techniques, using silicon strip detectors in edge-on mode, as a further development of the already reported angiographic and mammographic prototypes. The much reduced inactive region of the present detectors allows for increased efficiency at the low energy end of the diagnostic range, while the increased strip length allows to use the system with good efficiency up to at least 50 keV.
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