A priori selection of the regularization parameters in emission tomography by Fourier synthesis.
This paper describes how the stability of the inverse problem underlying emission tomography can be measured and controlled in clinical settings. We show how the Lanczos approximation provides a way to regularize a certain class of iterative reconstruction algorithms through a given level of noise or resolution in the slices and for a given acquisition protocol. Moreover, we show how the same Lanczos approximation can be used to decide when the iterative reconstruction algorithm actually converges for a given machine precision. These ideas are illustrated by means of reconstructions of simulated and actual emission datasets.
Department of Nuclear Medicine, Lapeyronie University Hospital, 371 Avenue du Doyen G. Giraud, 34295 Montpellier Cedex 5, France. d-mariano_goulart@chu-montpellier.fr
D
D
Mariano-Goulart
P
P
Maréchal
S
S
Gratton
L
L
Giraud
M
M
Fourcade
D000465:Algorithms; D005583:Fourier Analysis; D005602:France; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D014055:Tomography, Emission-Computed / Q000592:standards*