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  • 1985-1989  (2)
  • 1
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    Coded-aperture imaging in nuclear medicine (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Coded-aperture imaging is a technique for imaging sources that emit high-energy radiation. This type of imaging involves shadow casting and not reflection or refraction. High-energy sources exist in x ray and gamma-ray astronomy, nuclear reactor fuel-rod imaging, and nuclear medicine. Of these three areas nuclear medicine is perhaps the most challenging because of the limited amount of radiation available and because a three-dimensional source distribution is to be determined. In nuclear medicine a radioactive pharmaceutical is administered to a patient. The pharmaceutical is designed to be taken up by a particular organ of interest, and its distribution provides clinical information about the function of the organ, or the presence of lesions within the organ. This distribution is determined from spatial measurements of the radiation emitted by the radiopharmaceutical. The principles of imaging radiopharmaceutical distributions with coded apertures are reviewed. Included is a discussion of linear shift-variant projection operators and the associated inverse problem. A system developed at the University of Arizona in Tucson consisting of small modular gamma-ray cameras fitted with coded apertures is described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Langley Research Center, Visual Information Processing for Television and Telerobotics; p 33-45
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Current developments in optical engineering and commercial optics; Proceedings of the Meeting, San Diego, CA, Aug. 7-11, 1989 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Various papers on current developments in optical engineering and commercial optics are presented. Individual topics addressed include: large optics fabrication technology drivers and new manufacturing techniques, new technology for beryllium mirror production, design examples of hybrid refractive-diffractive lenses, optical sensor designs for detecting cracks in optical materials, retroreflector field-of-view properties for open and solid cube corners, correction of misalignment-dependent aberrations of the HST via phase retrieval, basic radiometry review for seeker test set, radiation effects on visible optical elements, and nonlinear simulation of efficiency for large-orbit nonwiggler FELs.
    Keywords: OPTICS
    Type: SPIE-1168 , Current Developments in Optical Engineering and Commercial Optics; Aug 07, 1989 - Aug 11, 1989; San Diego, CA; United States
    Format: text
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