. 2020 Jul 22;20(15):4079. doi: 10.3390/s20154079

Table 5.

Final results obtained for various methods for FHR_U signal determination based on a raw US signal in relation to the reference FHR_E from direct FECG.

Parameter	FHR Determination Method
Parameter	FHR_CTG	FHR_U D1	FHR_U D2
$\bar{Δ T_{i}}$ (ms)	0.13	0.11	0.04
$S D_Δ T_{i}$ (ms)	4.01	3.53	2.14
$\bar{\| Δ T_{i} \|}$ (ms)	2.78	1.91	1.35
FHR signal loss (%)	0.0	0.47	0.41