Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 54, Issue 4, Pages 1032-1039Publisher
WILEY
DOI: 10.1002/mrm.20654
Keywords
water-fat decomposition; field map; region growing; phase ambiguity; IDEAL
Funding
- NCI NIH HHS [CA 94305] Funding Source: Medline
- NCRR NIH HHS [RR09784] Funding Source: Medline
Ask authors/readers for more resources
Robust fat suppression techniques are required for many clinical applications. Multi-echo water-fat separation methods are relatively insensitive to B-0 field inhomogeneity compared to the fat saturation method. Estimation of this field inhomogeneity, or field map, is an essential and important step, which is well known to have ambiguity. For an iterative water-fat decomposition method recently proposed, ambiguities still exist, but are more complex in nature. They were studied by analytical expressions and simulations. To avoid convergence to incorrect field map solutions, an initial guess closer to the true field map is necessary. This can be achieved using a region growing process, which correlates the estimation among neighboring pixels. Further improvement in stability is achieved using a low-resolution reconstruction to guide the selection of the starting pixels for the region growing. The proposed method was implemented and shown to significantly improve the algorithm's immunity to field inhomogeneity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available