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Titolo:
VD-AUTO-SMASH imaging
Autore:
Heidemann, RM; Griswold, MA; Haase, A; Jakob, PM;
Indirizzi:
Univ Wurzburg, Dept Phys, D-97074 Wurzburg, Germany Univ Wurzburg Wurzburg Germany D-97074 t Phys, D-97074 Wurzburg, Germany
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 6, volume: 45, anno: 2001,
pagine: 1066 - 1074
SICI:
0740-3194(200106)45:6<1066:VI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPATIAL HARMONICS SMASH; SIMULTANEOUS ACQUISITION; ARTIFACTS; RECONSTRUCTION; REDUCTION;
Keywords:
SMASH; AUTO-SMASH; simultaneous acquisition; PPA; RF coil array; MR image reconstruction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Jakob, PM Univ Wurzburg, Dept Phys, Hubland, D-97074 Wurzburg, Germany Univ Wurzburg Hubland Wurzburg Germany D-97074 urzburg, Germany
Citazione:
R.M. Heidemann et al., "VD-AUTO-SMASH imaging", MAGN RES M, 45(6), 2001, pp. 1066-1074

Abstract

Recently a self-calibrating SMASH technique, AUTO-SMASH, was described. This technique is based on PPA with RF coil arrays using auto-calibration signals. In AUTO-SMASH, important coil sensitivity information required for successful SMASH reconstruction is obtained during the actual scan using the correlation between undersampled SMASH signal data and additionally sampledcalibration signals with appropriate offsets in k-space. However, AUTO-SMASH is susceptible to noise in the acquired data and to imperfect spatial harmonic generation in the underlying coil array. In this work, a new modified type of internal sensitivity calibration, VD-AUTO-SMASH, is proposed. This method uses a VD k-space sampling approach and shows the ability to improve the image quality without significantly increasing the total scan time. This new k-space adapted calibration approach is based on a k-space-dependent density function. In this scheme, fully sampled low-spatial frequency data are acquired up to a given cutoff-spatial frequency. Above this frequency, only sparse SMASH-type sampling is performed. On top of the VD approach,advanced fitting routines, which allow an improved extraction of coil-weighting factors in the presence of noise, are proposed. It is shown in simulations and in vivo cardiac images that the VD approach significantly increases the potential and flexibility of rapid imaging with AUTO-SMASH. (C) 2001WiIey-Liss, inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 17/01/20 alle ore 20:17:49