Table 1.

Water–fat MR imaging distinguishes BAT from WAT.

	Ex-vivo WFI experiment 1		Ex-vivo WFI experiment 2
PDFF (%)	High resolution	Q Low resolution	High resolution	Q Low resolution
	$\text{Mean}\pm \mathrm{SD}$ (min to max)	$\text{Mean}\pm \mathrm{SD}$ (min to max)	$\text{Mean}\pm \mathrm{SD}$ (min to max)	$\text{Mean}\pm \mathrm{SD}$ (min to max)
BAT	$25\pm 5$ (12 to 37)	$23\pm 6$ (13 to 45)	$21\pm 8$ (6 to 39)	$27\pm 6$ (17 to 40)
WAT	$87\pm 7$ (66 to 100)	$76\pm 7$ (65 to 93)	$82\pm 5$ (61 to 93)	$73\pm 6$ (56 to 89)

Note: BAT, brown adipose tissue; WAT, white adipose tissue; Q, quantitative; PDFF, proton density fat fraction; and SD, standard deviation.

Note: Ex-vivo experiments from euthanized murine BAT and WAT demonstrating differences in PDFF between BAT and WAT. No difference was seen in PDFF between high spatial resolution and quantitative (Q) low spatial resolution multiecho WFI.