Abstract
A novel form of filter for SPECT is described, in which,after back projection and summation, the reconstructed signal is a measureof the total activity within a ring of specified radius, centre and width.The filter is applied to the problem of using Compton scatteredradiation to locate external boundaries.In the simple case of the determination of the radius ofa circular scattering body of known centre, the filter output would identifya transition region and define an appropriate threshold as the boundarywas crossed. However it can alsobe applied to locate the boundaries seen in individual SPECT projectionsand hence trace out the envelope of the scattering body.Monte Carlo simulation based on 99mTc is used to testthe performance of the filter in a range of situations, with encouragingresults.
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