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Proceedings Paper

Quantifying and correcting motion artifacts in MRI
Author(s): Philip J. Bones; Julian R. Maclaren; Rick P. Millane; Richard Watts
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Paper 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.

Paper Details

Date Published: 5 September 2006
PDF: 12 pages
Proc. SPIE 6316, Image Reconstruction from Incomplete Data IV, 631608 (5 September 2006); doi: 10.1117/12.681684
Show Author Affiliations
Philip J. Bones, Univ. of Canterbury (New Zealand)
Julian R. Maclaren, Univ. of Canterbury (New Zealand)
Rick P. Millane, Univ. of Canterbury (New Zealand)
Richard Watts, Univ. of Canterbury (New Zealand)

Published in SPIE Proceedings Vol. 6316:
Image Reconstruction from Incomplete Data IV
Philip J. Bones; Michael A. Fiddy; Rick P. Millane, Editor(s)

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