ONE-SHOT SPATIALLY-RESOLVED VELOCITY IMAGING

For quantitative velocity measurement, we have developed a technique t hat acquires full velocity spectra without cardiac gating, After a cyl indrical excitation restricts imaging to one spatial dimension, data a re acquired while an oscillating gradient is played out. After each ex citation, an image of velocity versus spatial location is obtained. Fo r a given spatial location, a series of these images can be used to fo rm an image of velocity versus time. Acquisition times are much shorte r 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 veloc ity resolution and superior off-resonance properties.