A time-efficient high-resolution 3D fresh-blood imaging technique is proposed. The acquisition matrix size was increased from 256 to 512 in both readout and in-plane phase-encoding dimensions. Imaging efficiency was improved using compressed sensing together with k-space subtraction, so that the acquisition time is not prolonged compared to standard-resolution protocols. To avoid flow-related arterial signal voids, velocity-compensation gradients were used instead of velocity-spoiling gradients, and the spoiler gradients in the slice-encoding direction were increased. By decreasing the pixel size, the overall vessel sharpness and depiction of small vessels were significantly improved, at the cost of reducing the contrast-to-noise ratio.
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