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Titolo:
SPATIAL-RESOLUTION PROPERTIES OF PENALIZED-LIKELIHOOD IMAGE-RECONSTRUCTION - SPACE-INVARIANT TOMOGRAPHS
Autore:
FESSLER JA; ROGERS WL;
Indirizzi:
UNIV MICHIGAN ANN ARBOR MI 48109
Titolo Testata:
IEEE transactions on image processing
fascicolo: 9, volume: 5, anno: 1996,
pagine: 1346 - 1358
SICI:
1057-7149(1996)5:9<1346:SPOPI>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
EMISSION COMPUTED-TOMOGRAPHY; NOISE PROPERTIES; ATTENUATION CORRECTION; EM ALGORITHM; TRANSMISSION; CONVERGENCE; REGULARIZATION; QUANTITATION; INFORMATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Fessler e W.L. Rogers, "SPATIAL-RESOLUTION PROPERTIES OF PENALIZED-LIKELIHOOD IMAGE-RECONSTRUCTION - SPACE-INVARIANT TOMOGRAPHS", IEEE transactions on image processing, 5(9), 1996, pp. 1346-1358

Abstract

This paper examines the spatial resolution properties of penalized-likelihood image reconstruction methods by analyzing the local impulse response. The analysis shows that standard regularization penalties induce space-variant local impulse response functions, even for space-invariant tomographic systems, Paradoxically, for emission image reconstruction, the local resolution is generally poorest in high-count regions. We show that the linearized local impulse response induced by quadratic roughness penalties depends on the object only through its projections. This analysis leads naturally to a modified regularization penalty that yields reconstructed images with nearly uniform resolution. The modified penalty also provides a very practical method for choosingthe regularization parameter to obtain a specified resolution in images reconstructed by penalized-likelihood methods.

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Documento generato il 05/07/20 alle ore 10:00:22