Coded Aperture Imaging Using On-Axis Fresnel Zone Plates and Extended Gamma-Ray Sources

Tipton, Mike; Dowdey, J. E.; Bonte, Frederick J.; Caulfield, H. John

doi:10.1148/112.1.155

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Principle Of Elimination Of DC In In-line Holograms1

Introduction1

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1978

2024

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Cited by 13 publications

(2 citation statements)

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“…A hologram is basically a zone plate possessing both dispersive and imaging properties and it is termed as positive or negative depending upon whether the central zone is transparent or opaque (Tipton et al 1974). It is interesting to note that in the light of these facts the diffraction effects from a positive and a negative hologram could be expected to be similar to the diffraction effects from a circular aperture and a circular opaque disc respectively.…”

Section: Principle Of Elimination Of DC In In-line Hologramsmentioning

confidence: 99%

On the elimination of DC in reconstructed wavefronts from in-line holograms

Pappu

Rao

1978

Pramana - J. Phys.

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Section: Principle Of Elimination Of DC In In-line Hologramsmentioning

confidence: 99%

On the elimination of DC in reconstructed wavefronts from in-line holograms

Pappu

Rao

1978

Pramana - J. Phys.

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“…The application of coded aperture techniques in medical imaging began over ten years ago with the use of stationary apertures typified by the Fresnel zone plate [1][2][3] or multiple pinhole apertures [4,5]. A single coded image is recorded using these techniques, and is decoded using the unique spatial properties of the code.…”

Section: Introductionmentioning

confidence: 99%

Application of coded apertures in tomographic head scanning

Knoll

Rogers

Koral

et al. 1984

Nuclear Instruments and Methods in Physics Research

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A circular ring tomograph, designated SPRINT, is under development for single photon emission tomography of the human head. Most data to date have been gathered using a single rotating slit inside the detector ring to define ray directions. As an alternative method, we have also investigated the use of multiplexed slit patterns consisting of a pseudorandom binary code. From theoretical considerations, one would expect that the substitution of the code for the single slit would have potential advantages in reducing statistical noise in tomographic images of small objects. It has been our experience that this improvement is marginal at best for the types of source distributions encountered in clinical brain imaging. However, the code shows substantial advantage in suppressing uncorrelated backgrounds and the effects of highly penetrating gamma ray components in the source.

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