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Radiology, Vol 179, 139-142, Copyright © 1991 by Radiological Society of North America

ARTICLES

Adaptive motion compensation in MR imaging without use of navigator echoes

JP Felmlee, RL Ehman, SJ Riederer and HW Korin
MR Research Laboratory, Mayo Clinic and Foundation, Rochester, MN 55905.

Retrospective correction of magnetic resonance (MR) image data to eliminate the effects of patient motion is possible with use of adaptive correction techniques. These methods require an accurate record of the motion that occurs during imaging. The authors evaluated whether motion information suitable for adaptive correction could be obtained from phase-encoded image data alone rather than from separate navigator echoes. Once such displacements were estimated from the image data, motion correction proceeded with use of the same algorithm used for the navigator echoes. The results show that image data alone can be used to effectively measure view-to-view displacements in phantoms, but external markers are required for accurate measurement during axial head imaging of patients.


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M. Stuber, R. M. Botnar, P. G. Danias, K. V. Kissinger, and W. J. Manning
Submillimeter Three-dimensional Coronary MR Angiography with Real-time Navigator Correction: Comparison of Navigator Locations
Radiology, August 1, 1999; 212(2): 579 - 587.
[Abstract] [Full Text]


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