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Titolo:
Fourier-based approach to interpolation in single-slice helical computed tomography
Autore:
La Riviere, PJ; Pan, XC;
Indirizzi:
Univ Chicago, Dept Radiol, Chicago, IL 60637 USA Univ Chicago Chicago IL USA 60637 ago, Dept Radiol, Chicago, IL 60637 USA
Titolo Testata:
MEDICAL PHYSICS
fascicolo: 3, volume: 28, anno: 2001,
pagine: 381 - 392
SICI:
0094-2405(200103)28:3<381:FATIIS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGE; CT; RECONSTRUCTION; SCAN;
Keywords:
helical computed tomography; interpolation; image reconstruction; Fourier methods;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: La Riviere, PJ Univ Chicago, Dept Radiol, 5841 S Maryland Ave, Chicago, IL60637 USA Univ Chicago 5841 S Maryland Ave Chicago IL USA 60637 7 USA
Citazione:
P.J. La Riviere e X.C. Pan, "Fourier-based approach to interpolation in single-slice helical computed tomography", MED PHYS, 28(3), 2001, pp. 381-392

Abstract

It has recently been shown that longitudinal aliasing can be a significantand detrimental presence in reconstructed single-slice helical computed tomography (CT) volumes. This aliasing arises because the directly measured data in helical CT are generally undersampled by a factor of at least 2 in the longitudinal direction and because the exploitation of the redundancy offanbeam data acquired over 360 degrees to generate additional longitudinalsamples does not automatically eliminate the aliasing. In this paper we demonstrate that for pitches near 1 or lower, the redundant fanbeam data, when used properly, can provide sufficient information to satisfy a generalized sampling theorem and thus to eliminate aliasing. We develop and evaluate a Fourier-based algorithm, called 180FT, that accomplishes this. As background we present a second Fourier-based approach, called 360FT, that makes use only of the directly measured data. Both Fourier-based approaches exploitthe fast Fourier transform and the Fourier shift theorem to generate from the helical projection data a set of fanbeam sinograms corresponding to equispaced transverse slices. Slice-by-slice reconstruction is then performed by use of two-dimensional fanbeam algorithms. The proposed approaches are compared to their counterparts based on the use of linear interpolation-the 360LI and 180LI approaches. The aliasing suppression property of the 180FT approach is a clear advantage of the approach and represents a step toward the desirable goal of achieving uniform longitudinal resolution properties in reconstructed helical CT volumes. (C) 2001 American Association of Physicists in Medicine. [DOI: 10.1118/1.1350583].

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Documento generato il 26/01/20 alle ore 10:03:39