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Nuclear medicine images - barrel and pincusion distortion watch

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    I do not understand why pincushion and barrel distortion arises (based on multiple textbook readings).
    Please could someone explain what the following means?

    here is what most books say
    • Straight lines can appear as curved lines when the X- and Y- position signals do not change linearly with displacement distance of a radiation source across the face of the detector
    • For example, when a source is moved from the edge of one of the photomultiplier tubes (PMT) toward its centre, the light collection efficiency of that PMT increases more rapidly than the distance the source is moved.
    • The result is a characteristic pincushion distortion in areas of a gamma camera image lying directly in front of the PM tubes and barrel distortion between them
 
 
 
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Updated: October 29, 2015
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