Title :
Variance propagation for SPECT with energy-weighted acquisition
Author :
Jaszczak, Ronald J. ; Hoffman, David C. ; DeVito, Raymond P.
Author_Institution :
Dept. of Radiol., Duke Univ. Med. Center, Durham, NC, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
The authors compare the noise characteristic of SPECT (single-photon-emission computed tomography) images which are reconstructed from data acquired by both EWA energy-weighted acquisition and normal windowed acquisition (NWA). The comparisons used are propagation of variance and measurement of the noise power spectrum (NPS). For a selected Tl-201 weighing function, the analytically predicted variance (neglecting covariance terms) was compared with the variance from experimental SPECT scans of a phantom. Reasonable agreement was observed between predicted and measured percent rms noise. The NPS for EWA was skewed slightly with respect to the NWA spectrum
Keywords :
computerised tomography; radioisotope scanning and imaging; SPECT; energy-weighted acquisition; medical diagnostic imaging; noise characteristic; noise power spectrum; normal windowed acquisition; nuclear medicine; phantom; reconstructed images; rms noise; single-photon-emission computed tomography; variance propagation; Algorithm design and analysis; Buffer storage; Electromagnetic scattering; Event detection; Image reconstruction; Noise measurement; Noise reduction; Optical imaging; Particle scattering; Power measurement;
Journal_Title :
Nuclear Science, IEEE Transactions on
