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231223s1996 xx ||||| 00| ||eng c |
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|a pubmed25n0592.xml
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|a (DE-627)NLM177718285
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|a (NLM)18285223
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Fessler, J A
|e verfasserin
|4 aut
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| 245 |
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|a Spatial resolution properties of penalized-likelihood image reconstruction
|b space-invariant tomographs
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| 264 |
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|c 1996
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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| 338 |
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|a Band
|b nc
|2 rdacarrier
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| 500 |
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|a Date Completed 02.10.2012
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|a Date Revised 16.03.2022
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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| 520 |
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|a 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 choosing the regularization parameter to obtain a specified resolution in images reconstructed by penalized-likelihood methods
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|a Journal Article
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| 700 |
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|a Rogers, W L
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
|d 1992
|g 5(1996), 9 vom: 15., Seite 1346-58
|w (DE-627)NLM09821456X
|x 1057-7149
|7 nnns
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| 773 |
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|g volume:5
|g year:1996
|g number:9
|g day:15
|g pages:1346-58
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|d 5
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|h 1346-58
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