A scatter correction based on the deconvolution method in SPECT

Abstract

A scatter correction using a two-dimensional (2D) deconvolution method has been developed which compensates for Compton scattering in a triple-head gamma camera images. It assumes that the scatter distribution in any projection can be estimated from sinogram activity distribution using a position-invariant scatter kernel. The scatter distribution function has been derived from the measurements of a point source in a plastic phantom. The scatter correction technique is based on filtering by 2D convolution in the spatial domain. The spatial filter was designed to implement a 2D IIR filter. The quality of the compensation is also evaluated by comparing the ratio of the average counts/pixel with and without scatter correction in clinical brain blood flow studies.