Work

Field map estimation with a region growing scheme for iterative 3‐point water‐fat decomposition

Year: 2005

Type: article

Abstract: 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.

Source: Magnetic Resonance in Medicine

DOI: 10.1002/mrm.20654

Authors: Huanzhou Yu, Scott B. Reeder, Ann Shimakawa, Jean H. Brittain, Norbert J. Pelc

Institutions: Stanford Medicine, Stanford University

Language: English

Topic: Advanced MRI Techniques and Applications

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

Open Access status: bronze

Funders: Lucas Foundation, National Institutes of Health, National Cancer Institute, National Center for Research Resources

Awards: G1799460797, G388319536, Center for Advanced Magnetic Resonance Technology at Stanford, G9000139162