Segmented multiple plane reconstruction: a novel approximate reconstruction scheme for multi-slice spiral CT

A new reconstruction scheme for multi-row spiral CT is described and results are presented. The spiral path is decomposed into small, overlapping segments which are used for a separate convolution and backprojection yielding a stack of segment images which contain only projection data of a partial s...

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Bibliographic Details
Published in:Physics in medicine & biology 2002-08, Vol.47 (15), p.2571-2581, Article 301
Main Authors: Stierstorfer, Karl, Flohr, Thomas, Bruder, Herbert
Format: Article
Language:English
Subjects:
Algorithms
Biological and medical sciences
Computer Simulation
Databases, Factual
Humans
Image quality
Image reconstruction
Medical sciences
Optical filters
Phantoms, Imaging
Radiographic Image Enhancement - instrumentation
Radiographic Image Enhancement - methods
Radiography, Thoracic
Tomography, Spiral Computed - instrumentation
Tomography, Spiral Computed - methods
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Description
Summary:A new reconstruction scheme for multi-row spiral CT is described and results are presented. The spiral path is decomposed into small, overlapping segments which are used for a separate convolution and backprojection yielding a stack of segment images which contain only projection data of a partial scan (typically in the range of 20). These segment image stacks are, in a second step, reformatted to the requested image planes. In a third step, the reformatted segment images are added to obtain full images. The main benefit of the proposed algorithm is superior images quality. A 64-row dataset with a cone angle of 6.4 and a table feed of 80 mm per spiral turn has been reconstructed with excellent image quality. A filter direction for three-dimensional (3D) backprojection algorithms is suggested by investigating the limit where the partial scan size goes to zero.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/47/15/301