Journal ArticleDOI
A study of the image contrast in Fresnel zone plate imaging of extended sources
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TLDR
In this article, the image contrast is experimentally demonstrated to be a particular function of various parameters including the area of the source divided by the central Fresnel zone, and the best fit parameters are reported.About:
This article is published in Optics Communications.The article was published on 1975-05-01. It has received 2 citations till now. The article focuses on the topics: Fresnel zone & Zone plate.read more
Citations
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CGA: A high resolution, high sensitivity, three-dimensional imaging system for nuclear medicine
TL;DR: In this paper, a new nuclear medicine imaging system using cylindrically-shaped coded apertures (CGA) and computerized image reconstruction is described, and the system's salient features are: (1) full three-dimensional image, (2) very large geometric acceptance, (3) 0.1 mm resolution independent of depth for reasonable design parameters, all photons, scattered as well as unscattered, are used, energy discrimination, although useful, is not needed, gamma rays of any energy can be utilized, and absolute amounts of activity can be determined very accurately.
Journal ArticleDOI
Optically subtracted background in Fresnel zone-plate imaging
TL;DR: In this article, two techniques are described which remove this background by employing optical interference during the image reconstruction process, and the experimental results are presented for one of the techniques are compared to the other.
References
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Journal ArticleDOI
Fresnel zone plate imaging of gamma rays; theory
TL;DR: The general theory of coded-aperture imaging is presented, first for an arbitrary code and then for an on-axis zone plate, an off-axis Zone Plate, and a one-dimensional zone plate (or linear chirp).
Journal Article
Application of a Fresnel zone plate to gamma-ray imaging.
TL;DR: The fundamental principles of holography were first set forth by Gabor in 1948 and this technique has now been applied to imaging gamma-ray sources at the suggestion of Barrett.
Journal ArticleDOI
Quantum noise in Fresnel zone plate imaging
TL;DR: It is shown that the largest SNR advantage occurs for a point source, while for very large, uniform sources there may be a slight net disadvantage to using a zone plate, and that optical processing does not give the highest possible SNR.
Journal ArticleDOI
The use of half-tone screens in Fresnel zone plate imaging of incoherent sources
TL;DR: In this article, a half-tone screen was used to introduce a spatial carrier frequency and heterodyne the object spectrum into the passband of the zone plate, which greatly increased the usefulness of this system.
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