What are some of the physical principles of ultrasound/sonography?
Ultrasound refers to sound waves that are above the level of human hearing. Sound waves are actually pressure waves. These high frequency pressure waves are reflected when they strike physical matter, and these reflections (basically echoes) can be analyzed to yield information about this matter or to create graphical images. In addition, the waves themselves can be used therapeutically because of their ability to heat or break up matter – in this case tissue of the human body.
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