Imaging with rotating slit apertures and rotating collimators

G. R. Gindi, J. Arendt, H. H. Barrett, M. Y. Chiu, A. Ervin, C. L. Giles, M. A. Kujoory, E. L. Miller, R. G. Simpson

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The statistical quality of conventional nuclear medical imagery is limited by the small signal collect through low�efficiency conventional apertures. Coded�aperture imaging overcomes this by employing a two�step process in which the object is first efficiently detected as an ‘‘encoded’’ form which does not resemble the object, and then filtered (or ‘‘decoded’’) to form an image. We present here the imaging properties of a class of time�modulated coded apertures which, unlike most coded apertures, encode projections of the object rather than the object itself. These coded apertures can reconstruct a volume object nontomographically, tomographically (one plane focused), or three�dimensionally. We describe a new decoding algorithm that reconstructs the object from its planar projections. Results of noise calculations are given, and the noise performance of these coded�aperture systems is compared to that of conventional counterparts. A hybrid slit�pinhole system which combines the imaging advantages of a rotating slit and a pinhole is described. A new scintillation detector which accurately measures the position of an event in one dimension only is presented, and its use in our coded�aperture system is outlined. Finally, results of imaging test objects and animals are given.

Original languageEnglish (US)
Pages (from-to)324-339
Number of pages16
JournalMedical physics
Volume9
Issue number3
DOIs
StatePublished - May 1982

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Keywords

  • APERTURES
  • IMAGE PROCESSING
  • IMAGES
  • NOISE
  • NUCLEAR MEDICINE
  • RADIATION DETECTORS
  • SCINTILLATION COUNTERS
  • SIGNAL−TO−NOISE RATIO
  • THREE−DIMENSIONAL CALCULATIONS
  • TOMOGRAPHY

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

Cite this

Gindi, G. R., Arendt, J., Barrett, H. H., Chiu, M. Y., Ervin, A., Giles, C. L., Kujoory, M. A., Miller, E. L., & Simpson, R. G. (1982). Imaging with rotating slit apertures and rotating collimators. Medical physics, 9(3), 324-339. https://doi.org/10.1118/1.595171