Intrinsic Navigation from Velocity-Encoding Gradients in Phase-Contrast MRI
In conventional phase-contrast sequences, no alterations to the sequence timing or gradient waveform are needed.Navigator information is available for every repetition time and is naturally synchronized to the acquired imaging data.For multi-direction phase-contrast imaging different navigators are available to describe multi-dimensional linear motion.In conjunction with a with a high-density multi-channel coil receiver, each coil element provides spatial localization to the navigator signals.The navigator measured can be used for motion compensation purposes or to prospectively gate the acquisition.The method can be used for any sampling strategy (both Cartesian and non-Cartesian).
Can be used in conjunction with any type of phase-contrast MR imaging scheme and any type of reconstruction strategy.Allows for high-quality images to be reconstructed from exams with long acquisition times and other types of exams that are sensitive to motion defects.Can be used for any part of the body that requires assessment using phase-contrast imaging. It is especially useful in cases when patients have difficulty holding still for long time periods.For longer scans (>1 min), breath-holds are no longer possible and respiratory motion must be considered. With the navigation technique, this imaging modality can be made accessible to a wider patient population.
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