Gamma-Ray Imaging Using a Fresnel Zone Plate Aperture, Multiwire Proportional Chamber Detecior, and Computer Reconsteuction
- 1 January 1974
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 21 (1) , 678-684
- https://doi.org/10.1109/tns.1974.4327531
Abstract
The use of the multiwire proportional chamber in a Fresnel zone plate coded aperture gamma-ray imaging system is described. Image reconstruction is by computer using the fast Fourier transform algorithm. Criteria for design parameters of the imaging system are established. A calculation of the signal/noise ratio of images reconstructed from computer-generated on-axis zone plate holograms gives values, for larger numbers of gamma-ray events, which are somewhat smaller than theoretical values based on a shot-noise formula. The use of a positive and a negative zone plate combination is shown to eliminate the large background usually associated with on-axis zone plate imaging.Keywords
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