Abstract
A cone-beam algorithm which provides a practical implementation of B.D. Smith's cone-beam inversion formula (Opt. Eng., vol.29, p.524-34, 1990) is presented. For a cone-beam vertex orbit consisting of a circle and an orthogonal line. This geometry is easy to implement in a SPECT system, and it satisfies the cone-beam data sufficiency condition. The proposed algorithm is in the form of a convolution-back projection, and requires a pre-filtering procedure. Computer simulations show a reduction of the artifacts that are found with the Feldkamp algorithm where the cone-beam vertex orbit is a circle.