Quantitative SPECT brain imaging: Effects of attenuation and detector response

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/23.221054· OSTI ID:6309063

Gilland, D R; Jaszczak, R J; Bowsher, J E; Turkington, T G; Liang, Z; Greer, K L; Coleman, R E ^[1]

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1. Duke Univ., Durham, NC (United States). Dept. of Radiology

Two physical factors that substantially degrade quantitative accuracy in SPECT imaging of the brain are attenuation and detector response. In addition to the physical factors, random noise in the reconstructed image can greatly affect the quantitative measurement. The purpose of this work was to implement two reconstruction methods that compensate for attenuation and detector response, a 3D maximum likelihood-EM method (ML) and a filtered backprojection method (FB) with Metz filter and Chang attenuation compensation, and compare the methods in terms of quantitative accuracy and image noise. The methods were tested on simulated data of the 3D Hoffman brain phantom. The simulation incorporated attenuation and distance-dependent detector response. Bias and standard deviation of reconstructed voxel intensities were measured in the gray and white matter regions. The results with ML showed that in both the gray and white matter regions as the number of iterations increased, bias decreased and standard deviation increased. Similar results were observed with FB as the Metz filter power increased. In both regions, ML had smaller standard deviation than FB for a given bias. Reconstruction times for the ML method have been greatly reduced through efficient coding, limited source support, and by computing attenuation factors only along rays perpendicular to the detector.

• OSTI ID: 6309063
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Vol. 40:3; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ACCURACY
ATTENUATION
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
COMPARATIVE EVALUATIONS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
DIGITAL FILTERS
EMISSION COMPUTED TOMOGRAPHY
EVALUATION
FUNCTIONS
IMAGE PROCESSING
MEASURING INSTRUMENTS
NERVOUS SYSTEM
NOISE
ORGANS
PROCESSING
RADIATION DETECTORS
RESPONSE FUNCTIONS
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY