Effect of scatter on reconstructed image quality in cone beam CT: evaluation of a scatterreduction optimization function
2005 (English)In: Radiation Protection Dosimetry, ISSN 0144-8420 (print), 1742-3406 (online), Vol. 114, no 1-3, 337-340 p.Article in journal (Refereed) Published
The effect of scatter on reconstructed image quality in conebeam computed tomography was investigated and a function whichcan be used in scatter-reduction optimisation tasks was tested.Projections were calculated using the Monte Carlo method inan axially symmetric cone beam geometry consisting of a pointsource, water phantom and a single row of detector elements.Image reconstruction was performed using the filtered backprojectionmethod. Image quality was assessed by the L2-norm-based differencerelative to a reference image derived from (1) weighted linearattenuation coefficients and (2) projections by primary photons.It was found that the former function was strongly affectedby the beam hardening artefact and did not properly reflectthe amount of scatter but the latter function increased withincreasing beam width, was higher for the larger phantom andexhibited properties which made it a good candidate for scatter-reductionoptimisation tasks using polyenergetic beams.
Place, publisher, year, edition, pages
2005. Vol. 114, no 1-3, 337-340 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-13033DOI: 10.1093/rpd/nch541OAI: oai:DiVA.org:liu-13033DiVA: diva2:17697