Possibilities and limitations of coded aperture imaging


We have simulated the performance of various apertures used in Coded Aperture Imaging - optically. Coded pictures of extended and continuous-tone planar objects from the Annulus, Twin Annulus, Fresnel Zone Plate and the Uniformly Redundant Array have been decoded using a noncoherent correlation process. We have compared the tomographic capabilities of the Twin Annulus with the Uniformly Redundant Arrays based on quadratic residues and m-sequences. We discuss the ways of reducing the 'd. c.' background of the various apertures used. The non-ideal System-Point-Spread-Function inherent in a noncoherent optical correlation process produces artifacts in the reconstruction. Artifacts are also introduced as a result of unwanted cross-correlation terms from out-of-focus planes. We find that the URN based on m-sequences exhibits good spatial resolution and out-of-focus behaviour when imaging extended objects.

Divisions: College of Engineering & Physical Sciences
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Institution: Aston University
Uncontrolled Keywords: Possibilities,limitations,coded aperture imaging,twin annulus,biomedical imaging,y-ray imaging,tomography
Last Modified: 08 Dec 2023 08:13
Date Deposited: 12 Jan 2011 12:24
Completed Date: 1981
Authors: Silva, Ronald L.


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