Title :
Favor: a fast reconstruction algorithm for volume imaging in PET
Author :
Defrise, M. ; Townsend, D. ; Clack, R.
Author_Institution :
Div. of Nucl. Med., Vrije Univ., Brussels, Belgium
Abstract :
A novel 3-D reconstruction algorithm for volume imaging in positron emission tomography (PET) is presented. This algorithm obviates the need to forward-project the data which have not been measured due to the finite length of the scanner. This results in a significant improvement in the reconstruction speed with respect to the algorithm of N.J. Pelc (1979) and P.E. Kinahan and J.G. Rogers (1990). The partially measured oblique projections are filtered with a 1-D ramp filter, whereas the untruncated direct projections are filtered with a 2-D filter, the Favor filter, calculated to ensure an exact reconstruction. A simpler, approximate, version of this algorithm is also discussed in which all projections are filtered with a 1-D ramp function. These two algorithms have been implemented, and data from a volume PET scanner are presented.<>
Keywords :
computerised tomography; image reconstruction; radioisotope scanning and imaging; 1D ramp filter; Favor filter; PET; fast reconstruction algorithm; medical diagnostic imaging; nuclear medicine; partially measured oblique projections; positron emission tomography; reconstruction speed; untruncated direct projections; volume imaging; Concurrent computing; Data acquisition; Filtering; Filters; Image reconstruction; Length measurement; Nuclear medicine; Positron emission tomography; Reconstruction algorithms; Scattering;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.259250
