NDLI: Effects of nonuniform collimator sensitivity on variance of attenuation-corrected SPECT images

Content Provider	IEEE Xplore Digital Library
Author	Kijewski, M.F. Moore, S.C. Mueller, S.P.
Copyright Year	1994
Description	Author affiliation: Dept. of Radiol., Brigham & Women's Hospital, Boston, MA, USA (Kijewski, M.F.)
Abstract	The first step in all intrinsic attenuation-correction algorithms is multiplication of each measured projection by a function which compensates for photon attenuation between a line through the center of rotation, parallel to the detector, and the (convex) external object contour nearest the detector. A nonuniform collimator sensitivity profile which accomplishes this compensation physically rather than computationally would reduce the noise in the projections and, consequently, in the reconstructed images. The authors have compared the variance of reconstructed images of cylindrical phantoms of homogeneous activity concentration and attenuation coefficient for three collimator sensitivity profiles using both the original intrinsic attenuation-correction technique of Tretiak-Metz (1980) and Gullberg-Budinger (1981) and the variant developed by Tanaka (1984). The collimator sensitivity profiles the authors considered were the standard profile, with uniform sensitivity along the projection, and two nonuniform sensitivity profiles which were peaked at the center of the projection. The nonuniform collimator sensitivity profiles led to reduced variances throughout most of the image for both attenuation correction algorithms. These reductions in variance would be expected to lead to improved performance in quantitative imaging tasks.
Starting Page	1898
Ending Page	1901
File Size	342954
Page Count	4
File Format	PDF
ISBN	0780325443
DOI	10.1109/NSSMIC.1994.474695
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-10-30
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Collimators Object detection Detectors Single photon emission computed tomography Image reconstruction Biomedical imaging Attenuators Attenuation measurement Rotation measurement Noise reduction
Content Type	Text
Resource Type	Article

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