SOURCE DISTRIBUTION DEPENDENT SCATTER CORRECTION FOR PVI

Source distribution dependent scatter correction methods which incorpo rate different amounts of information about. the source position and m aterial distribution have been developed and tested. The techniques us e image to projection integral transformation incorporating varying de grees of information on the distribution of scattering material, or co nvolution subtraction methods, with some information about the scatter ing material included in one of the convolution methods. To test the t echniques, we apply them to data generated by Monte Carlo simulations which use geometric shapes or a voxelized density map to model the sca ttering material. Source position and material distribution have been found to have some effect on scatter correction. An image to projectio n method which incorporates a density map produces accurate scatter co rrection but is computationally expensive. Simpler methods, both image to projection and convolution, can also provide effective scatter cor rection. 1