Twisting radial lines with application to robust magnetic resonance imaging of irregular flow

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Abstract
A problem with magnetic resonance angiograms of vessels containing irregular flow isthat flow-induced dephasing can result in voids in the image. These void regionsare susceptible to misinterpretation as regions of stenosis or other vessel pathology. Flow-induced dephasing can be minimized by using radial lines to cover k space. However, radial lines provide a very nonuniform, and hence, inefficient, coverage of k space. By twisting the outer portions of the radial trajectories, undistorted images of very rapid and turbulent flow can be obtained with a reasonable number of RF excitations. o 1992 Academic Press, Inc.