Table 1.

Classification of the ultrasonic diagnostic techniques.

Name	Introductions	Characteristics	Applications	Ref.
A-type ultrasound	The amplitude modulation display method is adopted to display the echo amplitude of the tissue interface	It only reflects the one-dimensional structure information of human tissues, without scanning, the image cannot be called ultrasonic image	Brain, eyeball and pleural effusion examination	142
M-type ultrasound	The target is propagated with the sound beam and its displacement changes with time	It only reflects the one-dimensional structure information of human tissue, without scanning, the image cannot become ultrasonic image	Cardiovascular system examination	143
B-type ultrasound	The brightness modulation display method is adopted to obtain the anatomical information of the human body	It can form a section map by one-dimensional scanning	It is the most basic clinical model which can provide the anatomical information of the human organs	144
Three-dimensional imaging technology	It collects and processes a set of two-dimensional images, and then carries out three-dimensional reconstruction	It can obtain C plane or even F surface which cannot be obtained by the B-type ultrasound	As a supplement of the B-type ultrasound, it can display stereo images of the tissues and organs	145
Color Doppler ultrasound	It detects the doppler signal from the echo and converts it into an image	Color images can be used to show the direction and relative velocity of the blood flow	It can get the information about the body's blood flow and assess the tumor's blood supply	146