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Coded-Aperture Imaging

  • Chapter
Nuclear Medicine, Ultrasonics,and Thermography

Abstract

In a photographic camera, the camera lens forms an image of the object and the image is detected by the photographic film. In the Anger camera described in Chapter 4, the pinhole aperture or the multihole collimator performs the imaging operation while a detector system consisting of a scintillation crystal and an arrangement of photomultiplier tubes detects the image. The detector system in the Anger camera is very efficient and records almost every X-ray or γ-ray photon that arrives with an energy within the preselected energy window. Unfortunately, the imaging system severely limits the number of photons that arrive. A collimator typically passes only 0.01% of the radiation emitted by the object. Since the statistical quality of the images formed in this way is dependent on the number of photons collected from a single element of the object, one needs to collect as many photons as possible. Patient-dose restrictions limit the number of photons available, while exposure time is limited by temporal-resolution requirements in a dynamic study, by image degradation due to patient motion, by patient fatigue, or by the expense involved in tying up a clinical instrument for extended periods.

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Authors and Affiliations

  1. Optical Sciences Center, University of Arizona, Tucson, Arizona, 85721, USA

    R. G. Simpson & H. H. Barrett

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  1. R. G. Simpson
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  2. H. H. Barrett
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Editors and Affiliations

  1. College of Medicine, University of Arizona School of Medicine, Tucson, Arizona, USA

    Sol Nudelman Ph.D.  & Dennis D. Patton M.D.  & 

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© 1980 Plenum Press, New York

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Simpson, R.G., Barrett, H.H. (1980). Coded-Aperture Imaging. In: Nudelman, S., Patton, D.D. (eds) Nuclear Medicine, Ultrasonics,and Thermography. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3671-6_8

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  • DOI: https://doi.org/10.1007/978-1-4684-3671-6_8

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