Locally focused contrast‐enhanced carotid MRA

With conventional Fourier transform (FT) magnetic resonance imaging (MRI), it is difficult to perform contrast‐enhanced three‐dimensional (3D) MR angiography (MRA) with the temporal and spatial resolution necessary to depict the carotid arteries. However, locally focused (LF) MRI is a more efficient method that utilizes prior knowledge of the image content to reconstruct images from sparse k‐space samples. In this paper, we show how LF MRI can be used to perform high‐resolution gadolinium (Gd)‐enhanced 3D carotid MRA in less than 10 seconds. First, the accuracy of the technique was demonstrated by comparing LF and conventional (FT) images of a vascular phantom. Then the method was used to perform Gd‐enhanced 3D MRA of a patient's carotid arteries. Instead of using bolus timing, the arterial phase was retrospectively identified in a consecutive series of images, just as in X‐ray angiography. J. Magn. Reson. Imaging 1999;9:663–669. © 1999 Wiley‐Liss, Inc.

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