Improved k-space trajectory measurement with signal shifting.
Various techniques for k-space trajectory measurement have been described in the literature. Self-encoding gradient techniques are time-consuming due to the high number of phase-encoding steps needed. The approach with localized slices is faster, but its use apparently has not been reported in the context of high spatial resolution experiments. Signals associated with high k-space frequencies may then reach low or even zero values, and this may result in errors in the estimate of the trajectories at the k-space periphery. To overcome this problem without increasing the measurement duration of the localized slice method too much, a new approach is proposed in which an addition dephasing gradient applied prior to the gradient to be measured shifts the signal maximum.
Beaumont
Marine
M
Institut National de la Santé et de la Recherche Médicale (INSERM) U836, Grenoble, France.|Grenoble Institut des Neurosciences, Université Joseph Fourier, Grenoble, France.
Lamalle
Laurent
L
Institut Fédératif de Recherche (IFR) 1, Grenoble, France.
Segebarth
Christoph
C
Institut National de la Santé et de la Recherche Médicale (INSERM) U836, Grenoble, France.|Grenoble Institut des Neurosciences, Université Joseph Fourier, Grenoble, France.
Barbier
Emmanuel L
EL
Institut National de la Santé et de la Recherche Médicale (INSERM) U836, Grenoble, France.|Grenoble Institut des Neurosciences, Université Joseph Fourier, Grenoble, France.
D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical