TABLE 3.

Normalized amplitudes for each signal component in WM and GM regions for all samples, determined from fits in which the component decay constants and chemical shifts were fixed at the average WM values given in Table 2

	Sample	$\frac{{\mathrm{A}}_{\mathrm{W}}}{{\mathrm{A}}_{\mathrm{W}}+{\mathrm{A}}_{\mathrm{U}}+{\mathrm{A}}_{\mathrm{S}}}$	$\frac{{\mathrm{A}}_{\mathrm{U}}}{{\mathrm{A}}_{\mathrm{U}}+{\mathrm{A}}_{\mathrm{S}}}$	$\frac{{\mathrm{A}}_{\mathrm{S}}}{{\mathrm{A}}_{\mathrm{U}}+{\mathrm{A}}_{\mathrm{S}}}$
WM	1Ds	0.03	0.90	0.10
	2Ds	0.03	0.93	0.07
	1Dz	0.02	0.90	0.10
	2Dz	0.05	0.90	0.10
	1Hs	0.52	0.87	0.13
	2Hs	0.47	0.94	0.06
	1Hz	0.60	0.81	0.19
	2Hz	0.58	0.81	0.19
	Mean	0.54 a	0.88	0.12
	SD	0.06 a	0.05	0.05
GM	1Ds	0.06	0.77	0.23
	2Ds	0.06	0.93	0.07
	1Dz	0.04	0.81	0.19
	2Dz	0.09	0.81	0.19
	1Hs	0.71	0.75	0.25
	2Hs	0.61	0.96	0.04
	1Hz	0.76	0.73	0.27
	2Hz	0.75	0.70	0.30
	Mean	0.71 a	0.81	0.19
	SD	0.07 a	0.09	0.09

Note: Standard errors are on the order of 10⁻³–10⁻⁵. The mean value and SD for each tissue type are also provided, which for the normalized W‐component amplitudes were determined only over the H₂O samples. Relative water content is much higher in H₂O samples (“H”) than in D₂O samples (“D”) and higher in GM than in WM. The amplitude distribution of non‐aqueous signals A_U/A_S is around 90/10 in WM and 80/20 in GM. Frozen tissue (“z”) differs notably from fresh tissue (“s”) in H₂O samples: in the frozen samples, the normalized amplitude of the W‐component is higher and the A_U/A_S ratio tends toward a lower U‐component contribution (80/20 in WM and 70/30 in GM) than in the fresh counterparts.

^aCalculated only over H₂O samples.