Ultrasound uses sound waves to view internal organs of the body. Frequency of the sound waves used is so high that a human ear cannot hear. The amount of sound reflected by each tissue will be different so the image perceived will be different. Thus, tissues and organs will be seen on the screen of ultrasound device. By this method, different images can be detected for tissues like a cyst or tumor.
By Doppler ultrasound, the amount of blood flow inside a vessel and diseases interrupting this flow are established. It is also implemented by sending sound waves but blood is a moving structure so there will be changes in sound frequencies, giving information about blood flow.
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