One-shot spatially resolved velocity imaging.
For quantitative velocity measurement, we have developed a technique that acquires full velocity spectra without cardiac gating. After a cylindrical excitation restricts imaging to one spatial dimension, data are acquired while an oscillating gradient is played out. After each excitation, an image of velocity versus spatial location is obtained. For a given spatial location, a series of these images can be used to form an image of velocity versus time. Acquisition times are much shorter than for phase-contrast imaging or Fourier-encoded velocity imaging, obviating the need for cardiac gating. Although a two-shot version of this technique has been presented previously, we have developed a one-shot version that offers higher temporal resolution for a given velocity resolution and superior off-resonance properties.
Department of Electrical Engineering, Stanford University, California, USA.
G T
GT
Luk Pat
J M
JM
Pauly
B S
BS
Hu
D G
DG
Nishimura
D001013:Aorta, Thoracic / Q000033:anatomy & histology; D001783:Blood Flow Velocity; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008955:Models, Cardiovascular; D019047:Phantoms, Imaging; D012815:Signal Processing, Computer-Assisted