Performance of a prototype 32x32 pixel indirect X-ray imager based on a lateral selenium passive pixel sensor

Rasoul Keshavarzi, Kai Wang, Mohammad Y. Yazdandoost, Kyung Wook Shin, Feng Chen, Shaikh Hasibul Majid, Shiva Abbaszadeh, Karim S. Karim

Research output: Chapter in Book/Report/Conference proceedingConference contribution


An interface has been developed to capture frames taken by X-ray array imagers up to 64x64 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 32x32 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.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2012
Subtitle of host publicationPhysics of Medical Imaging
StatePublished - May 4 2012
EventMedical Imaging 2012: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 5 2012Feb 8 2012

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherMedical Imaging 2012: Physics of Medical Imaging
CountryUnited States
CitySan Diego, CA


  • Amorphous Selenium
  • Array Readout Circuitry
  • Lateral Selenium
  • Passive Pixel Sensor
  • X-ray imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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