Abstract #2419
             Real-Time Quantification of Brain Motion Using Gradient-Echo Phase
             Overall W,  Pauly J
             Stanford University
             A new technique for measuring very small displacements is applied to real-time imaging of pulsatile brain motion.  Nonlinear encoding provides high velocity-SNR over a broad range of velocities.  We demonstrate that this technique can measure motion well below 1 mm/sec without the need for long bipolar encoding gradients.  We have generated motion maps with true frame rates above 2 frames per second.  The technique may be applicable to prospective motion correction in diffusion imaging.