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Detection systems used for computerized tomography are often approximated by line integrals, despite having non-negligible beam widths due to a finite detector size and a finite acceptance angle. Ways to take into account these beam widths in algorithms for two-dimensional straight-line emission tomography are discussed. It is shown that the full three-dimensional imaging properties of the detection system, including filter functions, can be described in projection space. The relationships with the geometric matrix and étendue, and the application to the Cormack and Iterative Projection-space Reconstruction methods are discussed. Two techniques to compensate for most of the beam-width effects have been developed.

Additional information

Authors: INGESSON L C, JET Joint Undertaking, Abingdon, Oxon (GB);SMEULDERS P, JET Joint Undertaking, Abingdon, Oxon (GB);BÖCKER P J, JET Joint Undertaking, Abingdon, Oxon (GB);REICHLE R, JET Joint Undertaking, Abingdon, Oxon (GB);ROMANELLI M, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-R(98)02 EN (1998) 32pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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