TABLE II.

Results from all four canine studies. K₁ results were measured within whole LV myocardium VOI.

K1 (whole LV myocardium VOI)		Canine Study 1 (baseline)		Canine Study 2 (baseline)		Canine Study 3 (post-adenosine)		Canine Study 4 (baseline)
		Direct	Indirect	Direct	Indirect	Direct	Indirect	Direct	Indirect
100% counts	$\text{Mean}\stackrel{‒}{\theta }(\text{mL}\cdot {\text{min}}^{-1}\cdot {\text{cm}}^{-3})$	0.414	0.383	0.357	0.344	1.504	1.311	0.379	0.397
25% counts w. 25% IF	$\text{Mean}\overline{\overline{\theta }}(\text{mL}\cdot {\text{min}}^{-1}\cdot {\text{cm}}^{-3})$	0.406	0.375	0.354	0.351	1.422	1.282	0.381	0.358
	$(\overline{\overline{\theta }}-\stackrel{‒}{\theta })∕\stackrel{‒}{\theta }\times 100\%$	−1.9%	−2.1%	−0.8%	2.0%	−5.4%	−2.2%	0.5%	−9.8%
	${\overline{\text{CoV}}}_{\theta }$	27.3%	34.3%	31.4%	35.5%	30.4%	35.6%	25.7%	30.2%
25% counts w. 100% IF	$\text{Mean}\overline{\overline{\theta }}(\text{mL}\cdot {\text{min}}^{-1}\cdot {\text{cm}}^{-3})$	0.424	0.396	0.358	0.353	1.526	1.358	0.384	0.406
	$(\overline{\overline{\theta }}-\stackrel{‒}{\theta })∕\stackrel{‒}{\theta }\times 100\%$	−2.4%	3.4%	−0.3%	2.6%	1.5%	3.6%	1.3%	2.3%
	${\overline{\text{CoV}}}_{\theta }$	22.0%	30.8%	29.8%	33.9%	14.4%	29.5%	22.8%	29.1%