5 September 2006 Quantifying and correcting motion artifacts in MRI
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Abstract
Patient motion during magnetic resonance imaging (MRI) can produce significant artifacts in a reconstructed image. Since measurements are made in the spatial frequency domain ('k-space'), rigid-body translational motion results in phase errors in the data samples while rotation causes location errors. A method is presented to detect and correct these errors via a modified sampling strategy, thereby achieving more accurate image reconstruction. The strategy involves sampling vertical and horizontal strips alternately in k-space and employs phase correlation within the overlapping segments to estimate translational motion. An extension, also based on correlation, is employed to estimate rotational motion. Results from simulations with computer-generated phantoms suggest that the algorithm is robust up to realistic noise levels. The work is being extended to physical phantoms. Provided that a reference image is available and the object is of limited extent, it is shown that a measure related to the amount of energy outside the support can be used to objectively compare the severity of motion-induced artifacts.
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Philip J. Bones, Julian R. Maclaren, Rick P. Millane, Richard Watts, "Quantifying and correcting motion artifacts in MRI", Proc. SPIE 6316, Image Reconstruction from Incomplete Data IV, 631608 (5 September 2006); doi: 10.1117/12.681684; https://doi.org/10.1117/12.681684
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