Table 2.

The $Z_{\mathit{background}}^{ss}$ and $\mathrm{\Delta }Z$ at 1.95 ppm for the midbrain of GAMT and WT mice measured with different saturation powers. The calculated $R_{\mathit{guan}}^{\mathit{max}}$ values using Eqs.7&8 are also listed.

Power (μT)	WT			GAMT−/−
	$Z_{\mathit{background}}^{ss}$	$\mathrm{\Delta }Z$(10−2)	$R_{\mathit{guan}}^{\mathit{max}}$(10−2)	$Z_{\mathit{background}}^{ss}$	$\mathrm{\Delta }Z$(10−2)	$R_{\mathit{guan}}^{\mathit{max}}$(10−2)
0.6	0.804±0.02	1.9±0.5	1.6±0.4	0.821±0.02	1.2±0.2	1.0±0.2
0.8	0.718±0.02	2.3±0.5	2.4±0.4	0.736±0.02	1.5±0.2	1.6±0.2
1.0	0.659±0.02	2.4±0.2	3.0±0.4	0.665±0.02	1.3±0.2	1.6±0.2
1.2	0.608±0.03	2.4±0.3	3.6±0.4	0.569±0.03	1.1±0.1	1.7±0.1
1.4	0.536±0.03	2.3±0.2	4.5±0.3	0.505±0.03	1.1±0.2	2.2±0.2
1.6	0.473±0.04	2.0±0.2	5.0±0.5	0.435±0.04	0.9±0.1	2.3±0.2
1.8	0.409±0.04	1.6±0.1	5.4±0.4	0.391±0.04	0.8±0.1	2.6±0.2
2.0	0.364±0.04	1.3±0.1	5.5±0.4	0.351±0.04	0.5±0.1	2.3±0.2