Title :
A reconstruction algorithm for helical cone beam SPECT
Author :
Weng, Y. ; Zeng, G.L. ; Gullberg, G.T.
Author_Institution :
Dept. of Radiol., Utah Univ., Salt Lake City, UT, USA
Abstract :
A novel data-acquisition method which can obtain complete data for cone beam SPECT (single photon emission computed tomography) is proposed. One simultaneously rotates the gamma camera and translates the patient bed, so that cone beam projections can be obtained with the focal point traversing a helix surrounding the patient. A reconstruction algorithm for the helical cone beam projections is developed. Implementation of the algorithm requires a rebinning step to convert cone beam data to parallel data. The 3-D Radon inversion is used to reconstruct the image. This algorithm is shown to produce fewer artifacts than the commonly used Feldkamp algorithm
Keywords :
computerised tomography; image reconstruction; medical image processing; radioisotope scanning and imaging; cone beam data; data-acquisition method; focal point; gamma camera; helical cone beam SPECT; helical cone beam projections; helix; parallel data; patient bed; rebinning step; reconstruction algorithm; single photon emission computed tomography; three dimensional Radon inversion; Biomedical imaging; Cameras; Cities and towns; Detectors; Image converters; Image reconstruction; Imaging phantoms; Laboratories; Radiology; Reconstruction algorithms;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301077
