An interface has been developed to capture frames taken by X-ray array imagers up to 64×64 pixels. An application
specific integrated circuit (ASIC) designed solely for X-ray flat panel imaging readout circuitry, manufactured by
FLIR® called Indigo (also known as ISC9717), was used as part of charge-amplifier block. An Altera Cyclone II FPGA
is used to serve three purposes: Create pulses required for gate-driver block, Receive fast-stream data coming from the
Indigo chip, and Send data through RS-232 protocol over a serial cable to a personal computer.
Initial results for a 32×32 passive pixel sensor (PPS) with lateral amorphous Selenium metal-semiconductor-metal
(MSM) photodetector were presented in [1]. This work focuses more on methods used to improve the images obtained
from the array. Sharper images produced in sync with the light source are presented. In addition, insight into array
readout circuitry and capturing a frame from an array is discussed.
Previously, we reported on a single-pixel detector based on a lateral a-Se metal-semiconductor-metal structure, intended
for indirect conversion X-ray imaging. This work is the continuous effort leading to the first prototype of an indirect
conversion X-ray imaging sensor array utilizing lateral amorphous selenium. To replace a structurally-sophisticated
vertical multilayer amorphous silicon photodiode, a lateral a-Se MSM photodetector is employed which can be easily
integrated with an amorphous silicon thin film transistor passive pixel sensor array. In this work, both 2×2 macro-pixel
and 32×32 micro-pixel arrays were fabricated and tested along with discussion of the results.
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