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Vessel Tracking: Prospective Adjustment of Section-selective MR Angiographic Locations for Improved Coronary Artery Visualization over the Cardiac Cycle¹

¹ From the Applied Science Laboratory, GE Medical Systems, Room 110-MRI, Johns Hopkins Hospital, 600 N Wolfe St, Baltimore, MD 21287 (T.K.F.F.); the Department of Radiology, Uniformed Services University of the Health Sciences, Bethesda, Md (V.B.H., M.N.H.); and the Laboratory of Cardiac Energetics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md (V.B.H.). Received September 29, 1998; revision requested December 7; revision received April 12, 1999; accepted July 28. Address reprint requests to T.K.F.F. (e-mail: Thomas.Foo@med.ge.com).

To follow the motion of the coronary artery in magnetic resonance angiography, the authors evaluated vessel tracking, a method for prospective adjustment of the section location as a function of the delay from the cardiac trigger. In 10 volunteers and four patients, this method allowed the vessel to be maintained in the plane of acquisition throughout the cardiac cycle. With a single-phase multisection sequence, vessel-tracking acquisitions had an efficiency of 0.68 ± 0.04 for both the right and left coronary arteries compared with 0.19 ± 0.03 for a non–vessel-tracking acquisition (P < .001).

Index terms: Coronary vessels, MR, 54.12142 • Magnetic resonance (MR), motion correction, 54.12142 • Magnetic resonance (MR), vascular studies, 54.12142

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