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Fig. 5A —Proton (1H) hepatic MR spectroscopy. Single-voxel
spectrum in 39-year-old-woman with hepatic steatosis (A) and
29-year-old asymptomatic male volunteer (B). In healthy volunteer, only
resonances of water (f) and methylene (b), found in hepatic triglycerides and
fatty acids, are discernible. Normal liver contains less than 5% fat by
weight. In patient with hepatic steatosis, amplitude of methylene resonance
(b) is much higher. Several other lipid resonances are now visible. Note
chemical shifts of various resonances in 1H MR spectroscopy at 1.5
T: a, terminal methyl (CH3): 0.8 ppm; b, methylene
(CH2)n: 1.2 ppm; c, CH2-C = C: 1.9 ppm; d, C
= C-CH2-C = C: 2.6 ppm; e, CH2-O-COR: 4.15 ppm; f, water
(H2O): 4.7 ppm; g, CH = CH and CH = O: 5.2 ppm.
