Real-Time Quantification of Brain Motion Using Gradient-Echo Phase
Overall W, Pauly J
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.