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Titolo:
Transmission image reconstruction and redundant information in SPECT with asymmetric fanbeam collimation
Autore:
La Riviere, PJ; Pan, XC; Gilland, D; Kao, CM; Chang, W; Jaszczak, R;
Indirizzi:
Univ Chicago, Dept Radiol, Chicago, IL 60637 USA Univ Chicago Chicago IL USA 60637 ago, Dept Radiol, Chicago, IL 60637 USA Univ Florida, Dept Nucl & Radiol Engn, Gainesville, FL 32611 USA Univ Florida Gainesville FL USA 32611 iol Engn, Gainesville, FL 32611 USA Univ Florida, Dept Nucl & Radiol Engn, Chicago, IL 60612 USA Univ FloridaChicago IL USA 60612 cl & Radiol Engn, Chicago, IL 60612 USA Rush Presbyterian St Lukes Med Ctr, Dept Radiol, Chicago, IL 60612 USA Rush Presbyterian St Lukes Med Ctr Chicago IL USA 60612 ago, IL 60612 USA Duke Univ, Med Ctr, Dept Radiol, Durham, NC 27710 USA Duke Univ Durham NCUSA 27710 Med Ctr, Dept Radiol, Durham, NC 27710 USA
Titolo Testata:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
fascicolo: 4, volume: 48, anno: 2001,
parte:, 2
pagine: 1357 - 1363
SICI:
0018-9499(200108)48:4<1357:TIRARI>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPUTED-TOMOGRAPHY; SIMULTANEOUS EMISSION; ITERATIVE ALGORITHM; CT RECONSTRUCTION;
Keywords:
computed tomography; image reconstruction; single photon emission computed tomography; transmission tomography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: La Riviere, PJ Univ Chicago, Dept Radiol, Chicago, IL 60637 USA Univ Chicago Chicago IL USA 60637 l, Chicago, IL 60637 USA
Citazione:
P.J. La Riviere et al., "Transmission image reconstruction and redundant information in SPECT with asymmetric fanbeam collimation", IEEE NUCL S, 48(4), 2001, pp. 1357-1363

Abstract

Two novel approaches for the reconstruction of asymmetric fanbeam transmission computed tomography data are discussed. The first, called the hybrid approach, involves a Fourier-based rebinning of the fanbeam data into parallel-beam data. Reconstruction then proceeds by use of filtered backprojection (FBP). The second approach, called generalized fanbeam filtered backprojection (GFFBP), involves direct fanbeam FBP reconstruction of a modified fanbeam sinogram. In both cases, the data are multiplied by weight functions that seek to appropriately normalize redundant data while exploiting them for noise reduction. The GFFBP approach is found to have resolution-noise tradeoffs superior to those of the hybrid approach for low degrees of smoothing, although for the higher levels of smoothing likely to be of interest in practical situations, the difference between the approaches is negligible. However, GFFBP's distance-dependent fanbeam backprojection factor also produced a high-intensity peripheral artifact that impinged slightly upon the object of interest. Because it ultimately makes use of parallel-beam FBP forreconstruction, the hybrid approach avoids this artifact.

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Documento generato il 26/01/20 alle ore 00:38:55