Abstract #0044

Concomitant gradient effects on chemical shift encoded imaging

Timothy J Colgan^1,2, Diego Hernando¹, Samir D Sharma¹, Ann Shimakawa³, and Scott B Reeder^1,2,4,5,6

¹Radiology, University of Wisconsin, Madison, WI, United States, ²Medical Physics, University of Wisconsin, Madison, WI, United States, ³Global Applied Science Lab, GE Healthcare, Menlo Park, CA, United States, ⁴Biomedical Engineering, University of Wisconsin, Madison, WI, United States, ⁵Medicine, University of Wisconsin, Madison, WI, United States, ⁶Emergency Medicine, University of Wisconsin, Madison, WI, United States

Quantitative chemical shift-encoded (CSE) MRI techniques acquire complex-valued (magnitude and phase) images at multiple echo times (TE), enabling simultaneous mapping of fat-fraction, R2* (=1/T2*) and B₀ field. Applications of CSE-MRI include tissue fat quantification, iron quantification and quantitative susceptibility mapping (QSM). Recently, phase shifts due to concomitant gradients (CG) have been identified as a source of error for quantitative CSE techniques, so their effects on fat-fraction, R2* and B₀ maps are characterized in this study. CG correction of experimental data demonstrates that the detrimental effects of CG phase shifts can be removed before reconstruction to produce more accurate estimates of the fat-fraction, R2*, and field map measurements.

This abstract and the presentation materials are available to members only; a login is required.

Join Here