Simultaneous acquisition of phase‐contrast angiograms and stationary‐tissue images with Hadamard encoding of flow‐induced phase shifts

A technique for the simultaneous acquisition of three‐dimensional phase‐contrast angiograms and stationary‐tissue images is described. Hadamard multiplexed encoding of flow information permits image acquisition times that are a third shorter than those of previous phase‐contrast methods. The encoding scheme described also enables differentiation of flow‐induced phase shifts from phase shifts due to resonance offset conditions such as field inhomogeneities and chemical shift. Display strategies that combine this phase information with the flow image are described.