Title :
A novel SPECT collimation system and related reconstruction algorithm
Author :
Cao, ZongJian ; Tsui, Benjamin M W
Author_Institution :
Dept. of Biomed. Eng., North Carolina Univ., Chapel Hill, NC, USA
fDate :
30 Oct-5 Nov 1994
Abstract :
A novel collimation system for SPECT was proposed which consists of a series of parallel-hole collimators with different collimation angles, ranging from a small angle representing a conventional high resolution collimator to 90° for no collimation. A 2D reconstruction algorithm for the collimation system was derived. In the algorithm, projection data from different collimators were combined to compute line integrals with various orientations and then the series of line integrals were filtered, backprojected and summed to form the reconstructed image. Simulation studies show that the new collimation provides much increased detection efficiency with the same spatial resolution as compared to a conventional collimator. This is because the efficiency is determined by the collimators with large collimation angles and the resolution is determined by the smallest collimation angle and the number of collimators
Keywords :
biomedical equipment; image reconstruction; medical image processing; single photon emission computed tomography; SPECT collimation system; collimation angle; high resolution collimator; line integrals computation; medical diagnostic imaging; nuclear medicine; parallel-hole collimators series; projection data; reconstruction algorithm; spatial resolution; Cameras; Collimators; Degradation; Detectors; Geometry; Image reconstruction; Integral equations; Radiology; Reconstruction algorithms; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474596
