Whole-body continuously moving table fat-water MRI with dynamic B0 shimming at 3 Tesla.

Sengupta S, Smith DS, Gifford A, Welch EB
Magn Reson Med. 2016 76 (1): 183-90

PMID: 26198380 · PMCID: PMC4775426 · DOI:10.1002/mrm.25848

PURPOSE - The purpose of this work was to develop a rapid and robust whole-body fat-water MRI (FWMRI) method using a continuously moving table (CMT) with dynamic field corrections at 3 Tesla.

METHODS - CMT FWMRI was developed at 3 Tesla with a multiecho golden angle (GA) radial trajectory and dynamic B0 field shimming. Whole-body imaging was performed with 4 echoes and superior-inferior coverage of 1.8 meters without shims in 90 s. 716 axial images were reconstructed with GA profile binning followed by B0 field map generation using fast three-point seeded region growing fat-water separation and slice-specific 0(th) and 1(st) order shim calculation. Slice-specific shims were applied dynamically in a repeated CMT FWMRI scan in the same session. The resulting images were evaluated for field homogeneity improvements and quality of fat-water separation with a whole-image energy optimized algorithm.

RESULTS - GA sampling allowed high quality whole-body FWMRI from multiecho CMT data. Dynamic B0 shimming greatly improved field homogeneity in the body and produced high quality water and fat only images as well as fat signal fraction and R2 * relaxivity maps.

CONCLUSION - A rapid and robust technique for whole-body fat-water quantification has been developed with CMT MRI with dynamic B0 field correction. Magn Reson Med 76:183-190, 2016. © 2015 Wiley Periodicals, Inc.

© 2015 Wiley Periodicals, Inc.

MeSH Terms (15)

Adipose Tissue Adult Algorithms Beds Body Water Female Humans Image Enhancement Image Interpretation, Computer-Assisted Magnetic Resonance Imaging Male Patient Positioning Reproducibility of Results Sensitivity and Specificity Whole Body Imaging

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