Robert Herfkens

Publication Details

  • TRACKING OF CYCLIC MOTION WITH PHASE-CONTRAST CINE MR VELOCITY DATA JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING Pelc, N. J., Drangova, M., Pelc, L. R., Zhu, Y., Noll, D. C., BOWMAN, B. S., Herfkens, R. J. 1995; 5 (3): 339-345

    Abstract:

    A method of computing trajectories of objects by using velocity data, particularly as acquired with phase-contrast magnetic resonance (MR) imaging, is presented. Starting from a specified location at one time point, the method recursively estimates the trajectory. The effects of measurement noise and eddy current-induced velocity offsets are analyzed. When the motion is periodic, trajectories can be computed by integrating in both the forward and backward temporal directions, and a linear combination of these trajectories minimizes the effect of velocity offsets and maximizes the precision of the combined trajectory. For representative acquisition parameters and signal-to-noise ratios, the limitations due to measurement noise are acceptable. In a phantom with reciprocal rotation, the measured and true trajectories agreed to within 3.3%. Sample trajectory estimates of human myocardial regions are encouraging.

    View details for Web of Science ID A1995QZ28100015

    View details for PubMedID 7633112

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