29 March 2007 A phase unwrapping method for large-motion phase data in MR elastography
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We have developed a one-dimensional route-finding phase unwrapping method to handle Magnetic Resonance Elastography (MRE) phase data from very large induced motion. The method is able to unwrap data where the adjacent phase differences are within range [-2π, 2π) as opposed to the [-π, π) requirement for most phase unwrapping methods. With more unwrapping paths, the range of phase difference can be easily expanded to [-2Nπ, 2Nπ) (N = 1,2,3,...). The possible unwrapping path when using different numbers of relative phase offsets can be found by Monte Carlo simulation. Two phantom studies were performed to test the new unwrapping method. One study compared the new method with the classical Itoh's one-dimensional method and the other study combined the new method with twodimensional phase unwrapping method and unwraped three-dimensional MRE phase data with a sequential threedimensional unwrapping approach. The results from using different phase unwrapping methods were then compared and analyzed.
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Huifang Wang, Huifang Wang, John B. Weaver, John B. Weaver, Marvin M. Doyley, Marvin M. Doyley, Francis E. Kennedy, Francis E. Kennedy, Keith D. Paulsen, Keith D. Paulsen, "A phase unwrapping method for large-motion phase data in MR elastography", Proc. SPIE 6511, Medical Imaging 2007: Physiology, Function, and Structure from Medical Images, 65111S (29 March 2007); doi: 10.1117/12.710073; https://doi.org/10.1117/12.710073

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