Title :
The effects of incorrect modeling on noise and resolution properties of ML-EM images
Author :
Wilson, D.W. ; Barrett, H.H.
Author_Institution :
Dept. of Radiol., Arizona Univ., Tucson, AZ, USA
Abstract :
The effects of incorrect compensation for collimator blur in single-photon emission computed tomography (SPECT) images are studied in terms of the noise and resolution properties of the reconstructed images. Qualitative analysis of reconstructions of the Hoffman brain phantom show the counterintuitive behavior of longer noise correlations for high-pass filtered images. These qualitative observations are confirmed with more quantitative noise measures. However, the signal-to-noise ratio, in terms of the noise-equivalent quanta, remains largely unchanged. It is concluded that the compensation model affects SPECT image properties, though the effect on human task performance remains to be studied
Keywords :
brain; image reconstruction; image resolution; medical image processing; noise; single photon emission computed tomography; SPECT image properties; compensation model; high-pass filtered images; human task performance; medical diagnostic imaging; noise properties; noise-equivalent quanta; nuclear medicine; reconstructed images; resolution properties; signal-to-noise ratio; Collimators; Computed tomography; Humans; Image analysis; Image reconstruction; Image resolution; Imaging phantoms; Noise measurement; Signal resolution; Signal to noise ratio;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2000 IEEE
Conference_Location :
Lyon
Print_ISBN :
0-7803-6503-8
DOI :
10.1109/NSSMIC.2000.950125
