“…With the continuous development of computer and electronic technology, ultrasound has changed from the simplest two-dimensional imaging to three-dimensional or even four-dimensional imaging, from simple anatomical morphology imaging to molecular and functional imaging. In recent years, with the emergence of new ultrasound technologies, it plays an increasingly important role in clinical diagnosis and treatment (Li, Peng, Deng, Xu, Ye & Hang, 2017), such as contrast-enhanced ultrasound, shear wave elastography, automated breast volume scanning, superb mircovascular imaging, etc.…”