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(a) The schematic illustration of k-space trajectory for 2D PROPELLER (left) and 3D GRASE PROPELLER (right). Rather than a series of rotating “blades” in the 2D PROPELLER trajectory, 3D GRASE PROPELLER consists of a series of rotating “bricks” about the central z-axis. Note the k-space is under-sampled for illustration purpose. Only 4 of 16 blades are shown. (b) 3D GRASE pulse diagram for acquiring each brick.
