Share Email Print

Proceedings Paper

Fourier Method For Correction Of Depth-Dependent Collimator Blurring
Author(s): Robert M. Lewitt; Paul R. Edholm; Weishi Xia
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

A method is described for preprocessing projection data prior to image reconstruction in single-photon emission computed tomography. The projection data of the desired spatial distribution of emission activity is blurred by the point-response function of the collimator that is used to define the range of directions of gamma-ray photons reaching the detector. The point-response function of the collimator is not stationary, but depends on the distance from the collimator to the point. Conventional methods for deblurring collimator projection data are based on approximating the actual depth-dependent point-response function by a spatially-invariant blurring function, so that deconvolution methods can be applied independently to the data at each angle of view. The method described in this paper is based on Fourier analysis of the multi-angular data set as a whole, using special depth-dependent characteristics of the Fourier coefficients to achieve spatially-variant inverse filtering of the data in all views simultaneously. Preliminary results are presented for simulated data with a simple collimator model.

Paper Details

Date Published: 25 May 1989
PDF: 12 pages
Proc. SPIE 1092, Medical Imaging III: Image Processing, (25 May 1989); doi: 10.1117/12.953264
Show Author Affiliations
Robert M. Lewitt, University of Pennsylvania (United States)
Paul R. Edholm, University of Linkoping (Sweden)
Weishi Xia, University of Pennsylvania (United States)

Published in SPIE Proceedings Vol. 1092:
Medical Imaging III: Image Processing
Samuel J. Dwyer III; R. Gilbert Jost M.D.; Roger H. Schneider, Editor(s)

© SPIE. Terms of Use
Back to Top