Abstract #3601
Diffusion-weighted STEAM MRS to measure fat unsaturation in regions with low fat content
Stefan Ruschke 1 , Thomas Baum 1 , Hendrik Kooijman 2 , Marcus Settles 1 , Axel Haase 3 , Ernst J. Rummeny 1 , and Dimitrios C. Karampinos 1
1
Department of Diagnostic and Interventional
Radiology, Technische Universitt Mnchen, Munich,
Germany,
2
Philips
Healthcare, Hamburg, Germany,
3
Zentralinstitut
fr Medizintechnik, Technische Universitt Mnchen,
Garching, Germany
MR spectroscopy has been previously employed as a
technique for estimating fat unsaturation. However, if
the fat fraction is low and the water peak overlaps with
the olefinic fat peak, the quantification of fat
unsaturation can become challenging. Long-TE PRESS
sequences have been suggested as a way to reduce the
water peak and measure fat unsaturation. However, a TE
of the order of 200 ms should be employed to reduce
J-coupling effects, resulting in a low SNR. We present
an alternative approach to measure fat unsaturation
using a diffusion-weighted STEAM sequence, which is
shown to be able to reduce the water peak at moderate
TEs.
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