PMID: 6981056May 1, 1982Paper

Imaging with rotating slit apertures and rotating collimators

Medical Physics
G R GindiR G Simpson

Abstract

The statistical quality of conventional nuclear medical imagery is limited by the small signal collected 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 ...Continue Reading

Citations

Nov 13, 2013·European Journal of Nuclear Medicine and Molecular Imaging·Brian F Hutton
Jan 1, 1996·IEEE Transactions on Medical Imaging·M A LodgeD M Binnie
Jul 14, 2004·Physics in Medicine and Biology·Gengsheng L Zheng, Daniel Gagnon
Nov 3, 2005·Physics in Medicine and Biology·Steven R MeikleRichard B Banati
Aug 12, 1999·Physics in Medicine and Biology·A J Britten, R Klie

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