表 1. Subharmonic amplitude value in the pressure range of 7.5–45 mm Hg.

仿生门静脉压力为 7.5～45 mm Hg 时的亚谐波幅度值

仿生门静脉 压力/mm Hg	浓度 1∶3 000 幅度值/dB	浓度 1∶6 000 幅度值/dB
7.5	37.37	35.20
15.0	37.38	35.38
22.5	37.25	34.91
30.0	37.06	34.40
37.5	36.35	34.87
45.0	36.09	34.61