Title :
Comparison study for iterative reconstruction using a pinhole collimator and a rotating-slit collimator
Author :
Zhang, Bin ; Zeng, Larry
Author_Institution :
Dept. of Radiol., Utah Univ., Salt Lake City, UT
Abstract :
A rotating-slit system is proposed for small animal imaging. The spatial resolution and noise propagation properties of the rotating-slit system are evaluated and compared with a pinhole system using iterative methods. Our results show that the two systems achieve comparable resolutions, and the rotating-slit system has better noise performance than the pinhole system when the same detector sizes are applied. In addition, the rotating-slit system can be used for ROI reconstruction from truncated projections. This local tomography property of iterative reconstructions is only found for the rotating-slit system, but not found for the pinhole system
Keywords :
collimators; image reconstruction; image resolution; iterative methods; medical image processing; noise; single photon emission computed tomography; ROI reconstruction; SPECT; iterative reconstruction; noise propagation; pinhole collimator; rotating-slit collimator; small animal imaging; spatial resolution; Animals; Detectors; Geometry; Image reconstruction; Imaging phantoms; Iterative algorithms; Iterative methods; Optical collimators; Spatial resolution; Tomography;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2005 IEEE
Conference_Location :
Fajardo
Print_ISBN :
0-7803-9221-3
DOI :
10.1109/NSSMIC.2005.1596880
