Usually the Doppler ultrasound report form issued by the regular hospital has the following three parts in addition to the basic information such as name, gender, age, etc.: 1. the part of ultrasound seen, the organs and tissues examined, the actual situation observed by the examining physician including normal and abnormal seen, such as liver size measurement, whether the morphology is normal, whether the parenchymal echogenicity is homogeneous, whether there is fluid or solid occupancy, the internal vessels of the liver and The ultrasound images are usually accompanied by images of the main lesion features in positive cases and images of the main normal structures in negative cases. The ultrasound images are usually accompanied by images of the main normal structures in positive cases and images of the main normal structures in negative cases.