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Object shape dependent PSF model for SPECT imaging

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5 Author(s)
Beekman, F.J. ; Dept. of Med. Phys. & Biophys., Nijmegen Univ., Utrecht, Netherlands ; Eijkman, E.G.J. ; Viergever, M.A. ; Borm, G.F.
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An analytical expression for the point spread function (PSF) and the line spread function (LSF) of a parallel hole gamma camera is presented, for homogeneous media and for photons having mainly Compton interactions in the object. The PSF of scattered photons is described by convolving a zeroth-order modified Bessel function of the second kind with the unscattered PSF, which is approximated by a Gaussian. The complete PSF (scatter plus nonscatter) depends on the source distance ( z) and depth (d) of the source in the object. For convex-shaped emitting objects, the dependence of the PSF on the object contour can be incorporated by a simple correction. Thus, a complete mathematical model of the imaging of an activity distribution in a homogeneous medium is obtained. The model has been evaluated for 99mTechnetium line sources by using a LEAP collimator at various energy windows (ΔE). It is shown that the model is valid to a high accuracy at ΔE=15%, for a large range of values of z and d

Published in:

Nuclear Science, IEEE Transactions on  (Volume:40 ,  Issue: 1 )

Date of Publication:

Feb 1993

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