Artificial neural network aided non-invasive grading evaluation of hepatic fibrosis by duplex ultrasonography

Table 1 Grading standard for the evaluation of ultrasonographic changes on liver fibrosis

Variables	0	1	2
Liver envelope	Smooth	slightly coarse	obviously coarse or like wavy changes
Liver parenchyma	Homogeneous	Heterogenous	coarsened
Ascites	no or < 500 ml	500 ml ~ 3000 ml	> 3000 ml
HV waveform	Triphasic	Biphasic	monophasic