Prototype AEGIS: A pixel-array readout circuit for gamma-ray imaging

H. Bradford Barber, F. L. Augustine, L. Furenlid, C. M. Ingram, G. P. Grim

Research output: Contribution to journalConference articlepeer-review


Semiconductor detector arrays made of CdTe/CdZnTe are expected to be the main components of future high-performance, clinical nuclear medicine imaging systems. Such systems will require small pixel-pitch and much larger numbers of pixels than are available in current semiconductor-detector cameras. We describe the motivation for developing a new readout integrated circuit, AEGIS, for use in hybrid semiconductor detector arrays, that may help spur the development of future cameras. A basic design for AEGIS is presented together with results of an HSPICE™ simulation of the performance of its unit cell. AEGIS will have a shaper-amplifier unit cell and neighbor pixel readout. Other features include the use of a single input power line with other biases generated on-board, a control register that allows digital control of all thresholds and chip configurations and an output approach that is compatible with list-mode data acquisition. An 8×8 prototype version of AEGIS is currently under development; the full AEGIS will be a 64×64 array with 300 μm pitch.

Original languageEnglish (US)
Article number59230H
Pages (from-to)1-10
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventPenetrating Radiation Systems and Applications VII - San Diego, CA, United States
Duration: Aug 1 2005Aug 4 2005


  • CZT
  • CdTe
  • CdZnTe
  • Hybrid detector
  • Medical imaging
  • Nuclear medicine
  • Readout integrated circuit
  • Semiconductor camera
  • Semiconductor detector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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