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 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.
Siemens Medical Solutions, Siemensstr. 1 D-91301 Forchheim, Germany. karl.stierstorfer@siemens.com
Karl
K
Stierstorfer
Thomas
T
Flohr
Herbert
H
Bruder
D000465:Algorithms; D003198:Computer Simulation; D016208:Databases, Factual; D006801:Humans; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000295:instrumentation / Q000379:methods*; D013902:Radiography, Thoracic; D036542:Tomography, Spiral Computed / Q000295:instrumentation / Q000379:methods*