Table 4.

Accuracy of Left Ventricular EF Estimates Relative to Ground Truth EF of 0.403

	3‐Axis Eqn. 5	LA‐Area‐Length Eqn. 6	Bi‐Plane LA Eqn. 7	Dodge Eqn. (8)	Teichholz Eqn. (9)
First slice EF	0.308	4.19			0.407
First slice EF error, %	−23.6	4.0			1.1
Mean EF (n=12 or 6*)	0.271	0.449	0.470*	0.507*	0.361
EF mean error, %	−32.8	11.4	16.7	26.0	10.3
EF SD error, %	10.5	20.0	10.0	11.1	23.0
EF error range, %	−49.9 to −14.6	−20.71 to 42.1	5.5 to 29.0	13.5 to 39.7	−52.5 to 36.3

When using Equations 5, 6, and 9, the mean and SD were computed over 12 independent EF measurements (1 for each long‐axis [LA] slice). The error metrics for Equations 7 and 8 are based on 6 pairs of orthogonal long‐axis slices, as indicated by the asterisks. EF indicates ejection fraction.