Gamma-ray imaging using a CdZnTe pixel array and a high-resolution, parallel-hole collimator

G. A. Kastis, H. B. Barber, H. H. Barrett, S. J. Balzer, D. Lu, D. G. Marks, G. Stevenson, J. M. Woolfenden, M. Appleby, J. Tueller

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


The poor performance of current parallel-hole collimators is an impediment to planar high-resolution gamma-ray imaging, even when high-resolution semiconductor detector arrays are available. High-resolution parallel-hole collimators are possible but have not been fabricated because conventional collimator construction techniques severely limit achievable bore size and septal thickness. We describe development and testing of a high-resolution collimator with 4096 260-μm square bores and 380 μm pitch, matched to our existing 2.5 cm × 2.5 cm hybrid 64×64 CdZnTe arrays with multiplexer readout. The collimator is a laminar composite of about 100 layers of W sheets produced by photolithography and has efficiency of 5×10-5. We have demonstrated sub-millimeter spatial resolution at 140 keV in both phantom and animal imaging using this system. Images resolved individual vertebrae in the spine of a mouse and lymphatic channels and nodes in a rat. The collimator and semiconductor array could form a compact module for use in a wide variety of gamma-ray imaging systems.

Original languageEnglish (US)
Pages (from-to)1923-1927
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number6
StatePublished - Dec 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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