Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 59, Issue 3, Pages 571-580Publisher
WILEY
DOI: 10.1002/mrm.21522
Keywords
dixon imaging; linear prediction; variable projection; field map estimation; IDEAL
Funding
- NATIONAL CANCER INSTITUTE [R01CA098717] Funding Source: NIH RePORTER
- NCI NIH HHS [R01 CA098717, R01-CA098717] Funding Source: Medline
- NIBIB NIH HHS [P41-EB03631-16] Funding Source: Medline
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Water/fat separation in the presence of B-0 field inhomogeneity is a problem of considerable practical importance in MRI. This article describes two complementary methods for estimating the water/fat images and the field inhomogeneity map from Dixon-type acquisitions. One is based on variable projection (VARPRO) and the other on linear prediction (LIP). The VARPRO method is very robust and can be used in low signal-to-noise ratio conditions because of its ability to achieve the maximum-likelihood solution. The LIP method is computationally more efficient, and is shown to perform well under moderate levels of noise and field inhomogeneity. These methods have been extended to handle multicoil acquisitions by jointly solving the estimation problem for all the coils. Both methods are analyzed and compared and results from several experiments are included to demonstrate their performance.
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