liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Cone-Beam Reconstruction Using Filtered Backprojection
Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, The Institute of Technology.
2001 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

The art of medical computed tomography is constantly evolving and the last years have seen new ground breaking systems with multi-row detectors. These tomographs are able to increase both scanning speed and image quality compared to the single-row systems more commonly found in hospitals today. This thesis deals with three-dimensional image reconstruction algorithms to be used in future generations of tomographs with even more detector rows than found in currentmultirow systems.

The first practical algorithm for three-dimensional reconstruction from conebeamprojections acquired from a circular source trajectory is the FDKmethod. We present a novel version of this algorithm that produces images of higher quality. We also formulate a version of the FDK method that performs the backprojection in O(N3 logN) steps instead of the O(N4) steps traditionally required.

An efficient way to acquire volumetric patient data is to use a helical source trajectory together with a multi-row detector. We present an overview of existing reconstruction algorithms for this geometry. We also present a new family of algorithms, the PI methods, which seem to surpass other proposals in simplicity while delivering images of high quality.

The detector used in the PI methods is limited to a window that exactly fits the cylindrical section between two consecutive turns of the helical source path. A rebinning to oblique parallel beams yields a geometry with many attractive properties. The key property behind the simplicity of the PI methods is that each object point to be reconstructed is illuminated by the source during a rotation of exactly half a turn. This allows for fast and simple reconstruction.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2001. , 177 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 672
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-54325ISBN: 91-7219-919-9OAI: diva2:302800
Public defence
2001-02-23, C3, Hus C, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Available from: 2010-03-09 Created: 2010-03-09 Last updated: 2012-01-24Bibliographically approved

Open Access in DiVA

Cone-Beam Reconstruction Using Filtered Backprojection(7203 kB)2144 downloads
File information
File name FULLTEXT01.pdfFile size 7203 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Computer VisionThe Institute of Technology
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 2144 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 3776 hits
ReferencesLink to record
Permanent link

Direct link