Determination of Fetal Left Ventricular Volume Based on Two-Dimensional Echocardiography

Table 1

Operation time at different hidden layers of BP neural network.

Hidden layers	1	2	3	4	5	6	7	8
Training time (min)	6.83	8.64	10.51	13.72	16.93	17.38	19.68	21.43
Testing time (ms)	6.12	6.81	7.75	8.80	9.75	10.57	11.60	12.73