Me. Huber et al., Motion artifact reduction and vessel enhancement for free-breathing navigator-gated coronary MRA using 3D k-space reordering, MAGN RES M, 45(4), 2001, pp. 645-652
Citations number
20
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
Breathing-induced bulk motion of the myocardium during data acquisition may
cause severe image artifacts in coronary magnetic resonance angiography (M
RA). Current motion compensation strategies include breath-holding or free-
breathing MR navigator gating and tracking techniques. Navigator-based tech
niques have been further refined by the applications of sophisticated 2D k-
space reordering techniques. A further improvement in image quality and a r
eduction of relative scanning duration may be expected from a 3D k-space re
ordering scheme. Therefore, a 3D k-space reordered acquisition scheme inclu
ding a 3D navigator gated and corrected segmented k-space gradient echo ima
ging sequence for coronary MRA was implemented. This new zonal motion-adapt
ed acquisition and reordering technique (ZMART) was developed on the basis
of a numerical simulation of the Bloch equations. The technique was impleme
nted on a commercial 1.5T MR system, and first phantom and in vivo experime
nts were performed. Consistent with the results of the theoretical findings
, the results obtained in the phantom studies demonstrate a significant red
uction of motion artifacts when compared to conventional (non-k-space reord
ered) gating techniques. Preliminary in vivo findings also compare favorabl
y with the phantom experiments and theoretical considerations. Magn Reson M
ed 46:645-652, 2001. (C) 2001 Wiley-Liss, Inc.