Scatter-to-primary based scatter fractions for transmission dependent convolution subtraction of SPECT images
2003 (English)In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 48, no 22, N323-N328 p.Article in journal (Refereed) Published
In single photon emission computed tomography (SPECT), transmission-dependent convolution subtraction has been shown to be useful when correcting for scattered events. The method is based on convolution subtraction, but includes a matrix of scatter fractions instead of a global scatter fraction. The method can be extended to iteratively improve the scatter estimate, but in this note we show that this requires a modification of the theory to use scatter-to-total scatter fractions for the first iteration only and scatter-to-primary fractions thereafter. To demonstrate this, scatter correction is performed on a Monte Carlo simulated image of a point source of activity in water. The modification of the theory is compared to corrections where the scatter fractions are based on the scatter-to-total ratio, using one and ten iterations. The resulting ratios of subtracted to original counts are compared to the true scatter-to-total ratio of the simulation and the most accurate result is found for our modification of the theory.
Place, publisher, year, edition, pages
2003. Vol. 48, no 22, N323-N328 p.
IdentifiersURN: urn:nbn:se:umu:diva-4825DOI: 10.1088/0031-9155/48/22/N03PubMedID: 14680275OAI: oai:DiVA.org:umu-4825DiVA: diva2:144074