Table 1.

Lower and Upper Bounds Imposed on Parameter Estimates. Bounds of the DTI Model Parameters Are in μm²/ms.

Parameter(s)	lb	ub
$\ln ({\mathrm{S}}_0)$	0	$\text{inf}$
${\mathrm{D}}_{\text{xx}},{\mathrm{D}}_{\text{yy}},{\mathrm{D}}_{\text{zz}},{\mathrm{W}}_{\text{xxxx}},{\mathrm{W}}_{\text{xxyy}},{\mathrm{W}}_{\text{xxzz}},{\mathrm{W}}_{\text{yyyy}},{\mathrm{W}}_{\text{yyzz}},{\mathrm{W}}_{\text{zzzz}}$	0	2.5
${\mathrm{D}}_{\text{xy}},{\mathrm{D}}_{\text{xz}},{\mathrm{D}}_{\text{yz}},{\mathrm{W}}_{\text{xxxy}},{\mathrm{W}}_{\text{xxxz}},{\mathrm{W}}_{\text{xxyz}},{\mathrm{W}}_{\text{xyyy}},{\mathrm{W}}_{\text{xyyz}},{\mathrm{W}}_{\text{xyzz}},{\mathrm{W}}_{\text{xzzz}},{\mathrm{W}}_{\text{yyyz}},{\mathrm{W}}_{\text{yzzz}}$	−2.5	2.5
F	−7.6	7.6