Nonlinear regularization of iterative weighted filtered backprojection for helical cone-beam CT
2009 (English)In: IEEE Nuclear Science Symposium and Medical Imaging Conference,2008, IEEE , 2009, 4356-4361 p.Conference paper (Refereed)
We report on experiments on combining iterative weighted filtered backprojection with nonlinear regularization. The resulting methods allow for contrast dependent resolution. In combination with improved geometrical modeling of the aquisition process, they have the potential to improve high contrast resolution while preserving low contrast image properties. The two investigated methods have been evaluated by visual inspection and mean square error measurements. In the reconstruction results, strong suppression of wind-mill artifacts has been observed: within 7 iterations, there is a reduction in amplitude with more than a factor of 6. Furthermore, there is a clear reduction of pixel noise without any increase of errors at high contrast structures. The proposed methods can be used to efficiently improve image quality for certain applications. Future investigations will include analysis of spatial resolution properties with respect to contrast, and choice of regularization parameters depending on noise levels and spatial resolution requirements.
Place, publisher, year, edition, pages
IEEE , 2009. 4356-4361 p.
, IEEE Nuclear Science Symposium Conference Record, ISSN 1082-3654
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-44882DOI: 10.1109/NSSMIC.2008.4774383Local ID: 78104ISBN: 978-1-4244-2715-4ISBN: 978-1-4244-2714-7OAI: oai:DiVA.org:liu-44882DiVA: diva2:265744
IEEE Nuclear Science Symposium/Medical Imaging Conference