Title :
Detector Blurring and Detector Sensitivity Compensation for a Spinning Slat Collimator
Author :
Zeng, Gengsheng L.
Author_Institution :
Utah Center for Adv. Imaging Res., Utah, Salt Lake City, UT
Abstract :
This paper extends the well-known frequency-distance relation to a rotating-spinning parallel-slat collimator SPECT system, where the projection data are in the form of weighted planar integrals and the detection sensitivity function is inversely proportional to the distance between the point source and the detector. The three-dimensional (3D) Radon inversion formula is used in image reconstruction. The 3D backprojection is implemented as Marr´s two-step two-dimensional (2D) backprojectors. The frequency-distance relation is applied in the second step of the 2D backprojection. Both the collimator blurring and distance dependent sensitivity effect are compensated for
Keywords :
biomedical imaging; collimators; image reconstruction; particle detectors; single photon emission computed tomography; 3D Radon inversion formula; 3D backprojection; Marrs two-step 2D backprojectors; detector blurring; detector sensitivity compensation; frequency-distance relation; image reconstruction algorithm; point source; rotating-spinning parallel-slat collimator SPECT system; weighted planar integrals; Cameras; Collimators; Detectors; Frequency; Image reconstruction; Motion detection; Single photon emission computed tomography; Slabs; Spatial resolution; Spinning; Analytical image reconstruction algorithm; SPECT; frequency-distance relation;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2006.882574
