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Coronary MR Angiography: Selection of Acquisition Window of Minimal Cardiac Motion with Electrocardiography-triggered Navigator Cardiac Motion Prescanning—Initial Results¹

¹ From the Departments of Radiology (Y.W., R.W., I.R.M., T.D.N., J.W.B., M.R.P.) and Medicine (G.W.B.), Cornell University, Joan and Sanford I. Weill Medical College, 515 E 71st St, Suite S120, New York, NY 10021. Received March 17, 2000; revision requested May 2; revision received May 31; accepted July 11. Supported in part by research grants from the Whitaker Foundation and the American Heart Association and National Institutes of Health grant R01HL60879. Address correspondence to Y.W. (e-mail: yiwang@med.cornell.edu).

The authors developed an electrocardiography-triggered M-mode navigator-echo technique to help monitor cardiac motion and identify the period of minimal cardiac motion in the cardiac cycle. Coronary magnetic resonance angiography was performed in eight healthy adult volunteers and one patient with heart disease. To minimize cardiac motion effects, trigger delays were estimated with the navigator-echo technique and two empirical formulas. The quality of images obtained with the different delay times was compared for clarity of depiction of the coronary arteries. Image quality was best with the delay calculated with the navigator-echo technique.

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

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