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Titolo:
On the use of water phantom images to calibrate and correct eddy current induced artefacts in MR diffusion tensor imaging
Autore:
Bastin, ME; Armitage, PA;
Indirizzi:
Univ Edinburgh, Western Gen Hosp, Dept Med Phys & Med Engn, Edinburgh EH4 2XU, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH42XU Midlothian, Scotland
Titolo Testata:
MAGNETIC RESONANCE IMAGING
fascicolo: 6, volume: 18, anno: 2000,
pagine: 681 - 687
SICI:
0730-725X(200007)18:6<681:OTUOWP>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ECHO-PLANAR IMAGES; MAGNETIC-RESONANCE; CURRENT ARTIFACTS; DISTORTION; BRAIN;
Keywords:
diffusion; echo-planar; distortion; warping;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Bastin, ME Univ Edinburgh, Western Gen Hosp, Dept Med Phys & Med Engn, Crewe Rd, Edinburgh EH4 2XU, Midlothian, Scotland Univ Edinburgh Crewe Rd Edinburgh Midlothian Scotland EH4 2XU d
Citazione:
M.E. Bastin e P.A. Armitage, "On the use of water phantom images to calibrate and correct eddy current induced artefacts in MR diffusion tensor imaging", MAGN RES IM, 18(6), 2000, pp. 681-687

Abstract

The accurate determination of absolute measures of diffusion anisotropy invivo using single-shot, echo-planar imaging techniques requires the acquisition of a set of high signal-to-noise ratio, diffusion-weighted images that are free from eddy current induced image distortions. Such geometric distortions can be characterized and corrected in brain imaging data using magnification (M), translation (T), and shear (S) distortion parameters derivedfrom separate water phantom calibration experiments. Here we examine the practicalities of using separate phantom calibration data to correct high b-value diffusion tensor imaging data by investigating the stability of thesedistortion parameters, and hence the eddy currents, with time. It is foundthat M, T, and S vary only slowly with time (i.e., on the order of weeks),so that calibration scans need not be performed after every patient examination. This not only minimises the scan time required to collect the calibration data, but also the computational time needed to characterize these eddy current induced distortions. Examples of how measurements of diffusion anisotropy are improved using this post-processing scheme are also presented. (C) 2000 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 02:14:54