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Arterial MR Imaging Phase-Contrast Flow Measurement: Improvements with Varying Velocity Sensitivity during Cardiac Cycle¹

¹ From the MR Center, Institute of Experimental Clinical Research, Aarhus University Hospital, Skejby Sygehus, Brendstrupgaardsvej, DK-8200 Aarhus N, Denmark. Received May 19, 2003; revision requested August 6; revision received October 13; accepted December 9. Supported by Danish Medical Research Council grant 9902664, Danish Heart Foundation grant 97–2-1–5-22549, and the Kirsten Antonius Foundation. Address correspondence to S.R. (e-mail: steffen@mr.au.dk).

To reduce noise in velocity images of magnetic resonance (MR) phase-contrast measurements, the authors implemented and evaluated a pulse sequence that enables automatic optimization of the velocity-encoding parameter V_enc for individual heart phases in pulsatile flow on the basis of a rapid prescan. This sequence was prospectively evaluated by comparing velocity-to-noise ratios with those from a standard MR flow scan obtained in the carotid artery in eight volunteers. This sequence was shown to improve velocity-to-noise ratios by a factor of 2.0–6.0 in all but the systolic heart phase and was determined to be an effective technique for reducing noise in phase-contrast velocity measurements.

© RSNA, 2004

Index terms: Coronary vessels, flow dynamics, 54.12144 • Coronary vessels, MR, 54.12144 • Heart, flow dynamics, 51.12144 • Magnetic resonance (MR), noise reduction, 54.12144 • Magnetic resonance (MR), phase imaging, 54.12144 • Magnetic resonance (MR), vascular studies, 54.12144

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