Physics in ultrasound, help!?

Question

What purpose does the intensity reflection coefficient play in ultrasound imaging? Similarly what purpose does the transmission coeffiecient have? How are these two quatities used, related and what function do they have in aiding a radiographer?

Answer 1

First an image with ultrasound is a sonography or echography and non a radiography.

The importance of ultra sound is this

Ultra sounds have a good directivity . They reflect in a given direction and do not diffuse everywhere.

More over the most Important; When they reach a bounder between two media with different properties such an interface solid Liquid instead of being transmitted they are reflected and the amount of reflection increases the more different are the media. So, calculating the time between sending and receiving the echo, and knowing the celerity of sound you can make a card of the organ you investigate