A Method and Apparatus for Measuring and Correcting Motion Effects Using Navigator Echoes (Combined with D-2502)
- Others
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None
- *Abstract
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The overcoming of motion artifacts has been a major hurdle in developing high resolution magnetic resonance imaging as a medical diagnostic technology. Navigator echoes provide an effective method to monitor physiological motion, allowing motion artifacts to be suppressed by modifying the data acquisition accordingly. The displacement can be measured directly from the navigator phase using an algorithm suggested by Ahn (IEEE Trans Med Imaging 1987; MI-6:32-36). Although computationally efficient, it is susceptible to noise, particularly contributions from points at the edges of k-space.
Yi Wang and colleagues at the Weill Medical College of Cornell University have developed a k-space weighted least-squares (kLS) algorithm which fits a straight line to the motion-induced phase shift. The linear fit is weighted strongly to high SNR points near the k-space center and only weakly to the poor SNR points at the edges of k-space. This algorithm was found to be as efficient as Ahn's algorithm but more robust against noise.
- *Licensing
- Vibhu Sachdev(212) 746-6187sachdev@cornell.edu
- Country/Region
- USA
