Title :
Analytical reconstruction for helical cone-beam SPECT with non-uniform attenuation correction
Author :
Huang, Qiu ; Zeng, Gengsheng L. ; Gullberg, Grant T.
Author_Institution :
Dept. of Radiol., Utah Univ., Salt Lake City, UT, USA
Abstract :
This paper concerns image reconstruction for helical cone-beam (CB) single photon emission computed tomography (SPECT) with compensation of non-uniform attenuation. We present a filtering-backprojection-filtering algorithm of the FDK type by extending the FBP algorithms for attenuated fan-beam projections to the three-dimensional (3D) cone-beam projections. Each transaxial slice can be reconstructed from attenuated projection data acquired along a specific 2π segment of the helix. CB artifacts are less for smaller pitch of the helical trajectory. The algorithm is validated by numerical results for a simulated Shepp-Logan-like phantom and the Defrise phantom.
Keywords :
image reconstruction; medical image processing; phantoms; single photon emission computed tomography; Defrise phantom; FBP algorithms; FDK algorithm; analytical image reconstruction; filtering-backprojection-filtering algorithm; helical cone-beam SPECT; nonuniform attenuation correction; simulated Shepp-Logan-like phantom; single photon emission computed tomography; three-dimensional cone-beam projections; Attenuation; Biomedical imaging; Computed tomography; Data acquisition; Detectors; Filtering algorithms; Image reconstruction; Imaging phantoms; Iterative algorithms; Spirals;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2005 IEEE
Print_ISBN :
0-7803-9221-3
DOI :
10.1109/NSSMIC.2005.1596692
