DocumentCode :
863864
Title :
An ECAT Reconstruction Method Which Corrects for Attenuation and Detector Response
Author :
Ying-Lie, O
Author_Institution :
Institute of Nuclear Medicine University Hospital Utrecht Catharijnesingel 101 3511 GV Utrecht, The Netherlands
Volume :
30
Issue :
1
fYear :
1983
Firstpage :
632
Lastpage :
635
Abstract :
Measured projection values of activity distributions in tissue are degraded by the detector aperture function and the exponential attenuation along the path to the object boundary. The aperture function varies with the distance to the detector and turns the integration path into a "weighted cone" shape. Fortunately, summation of opposite views shows a nearly uniform response. Adding opposite projections reduces the problem to a deconvolution problem. Division of the projection values by the total attenuation along the path from the object boundary to the rotated axis yields an integral equation which is independent of the boundary. An additional assumption of constant attenuation in a circular activity region followed by Fourier series expansion of period 2¿ gives a set of solvable Volterra equations.
Keywords :
Apertures; Attenuation measurement; Deconvolution; Degradation; Detectors; Fourier series; Integral equations; Object detection; Reconstruction algorithms; Shape;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.1983.4332345
Filename :
4332345
Link To Document :
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