1) Learn how 2D and 3D filtered backprojection works. 2) Understand multi-slice spiral CT image reconstruction. 3) Study cone-beam effects to see why dedicated cone-beam reconstruction algorithms are required for scanners with many slices. 4) Learn about tilted plane ASSR-type and about Feldkamp-type cone-beam reconstruction. 5) Find out about cardiac CT and about phase-correlated CT image reconstruction.
The basic principles of image reconstruction are reviewed. Similarities between conventional 2D multi-slice spiral CT reconstruction and 3D cone-beam spiral CT reconstruction are used to introduce popular cone-beam reconstruction techniques such as the advanced single-slice rebinning (ASSR) and Feldkamp-type image reconstruction. We also discuss cardiac imaging. Here, a synchronization signal (ECG or kymogram) allows defining allowed data ranges that are exclusively used for reconstruction. Thereby highest temporal resolution is achieved and superb images of the heart can be provided in all motion phases (4D reconstruction).
Kachelriess, M,
Reconstruction Algorithms. Radiological Society of North America 2005 Scientific Assembly and Annual Meeting, November 27 - December 2, 2005 ,Chicago IL.
http://archive.rsna.org/2005/4407115.html
