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. Author manuscript; available in PMC: 2008 Oct 19.
Published in final edited form as: Magn Reson Med. 1994 May;31(5):513–520. doi: 10.1002/mrm.1910310507

FIG. 1.

FIG. 1

Basic one-dimensional velocity-profiling pulse sequence. Spiral-scan pulse excites a pencil of magnetization, and half-echo readout yields a profile along the pencil. The bipolar flow-encoding pulse shown at right may be added along any gradient axis to produce flow sensitivity in that direction, but is typically placed along GX. The bipolar waveform is toggled on alternate acquisitions, and the raw signal subtracted before 1D Fourier transformation, to yield a phase-contrast M-mode image.