Collimator Details

  • David Hamilton


Parallel hole collimators are ~25–80 mm thick and contain 3–9 × 104 holes. Originally the holes were circular but are now usually hexagonal, in low and medium energy collimators, and constructed by assembling strips of lead foil. High energy collimators still have round holes, although square or triangular holes are sometimes used in high sensitivity collimators. These tend to be constructed using a casting technique (IPSM 1992). The latter has been improved recently and, since the uniformity of cast collimators is generally better than that of foil, these are now recommended in low and medium energy collimators, especially for SPET (Moore et al. 1992).



Point Spread Function Single Photon Emission Tomography Short Path Length Septal Thickness Convergence Point 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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high energy


low energy


line spread function


medium energy


point spread function


single photon emission tomography


ultra high energy


very high energy


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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • David Hamilton
    • 1
  1. 1.Riyadh Al Kharj Hospital ProgrammeX990 Military HospitalRiyadhSaudi Arabia

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