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TOMOGRAPHY, September 2017, Volume 3, Issue 3:153-162
DOI: 10.18383/j.tom.2017.00011

High-Resolution MR Imaging of Muscular Fat Fraction—Comparison of Three T2-Based Methods and Chemical Shift-Encoded Imaging

Lena Trinh1, Emelie Lind1, Pernilla Peterson1, Jonas Svensson1, Lars E. Olsson1, Sven Månsson1

1Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne University Hospital, Malmö, Sweden;2Department of Medical Radiation Physics, Lund University, Lund, Sweden;3Medical Imaging and Physiology, Skåne University Hospital, Lund, Sweden

Abstract

Chemical shift-encoded imaging (CSEI) is the most common magnetic resonance imaging fat–water separation method. However, when high spatial resolution fat fraction (FF) images are desired, CSEI might be challenging owing to the increased interecho spacing. Here, 3 T2-based methods have been assessed as alternative methods for obtaining high-resolution FF images. Images from the calf of 10 healthy volunteers were acquired; FF maps were then estimated using 3 T2-based methods (2- and 3-parameter nonlinear least squares fit and a Bayesian probability method) and CSEI for reference. In addition, simulations were conducted to characterize the performance of various methods. Here, all T2-based methods resulted in qualitatively improved high-resolution FF images compared with high-resolution CSEI. The 2-parameter fit showed best quantitative agreement to low-resolution CSEI, even at low FF. The estimated T2-values of fat and water, and the estimated muscle FF of the calf, agreed well with previously published data. In conclusion, T2-based methods can provide improved high-resolution FF images of the calf compared with the CSEI method.

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