As sonographers, we depend upon echoes. If there were no echoes...well we would all be out of a job!
It is therefore important for sonographers to have a good grasp on the processes that produce echoes.
The video below describes these processes and covers on topics such as specular and scattering interfaces, the importance of an acoustic impedance mismatch, and percentages of incident, reflected, and transmitted sound. A listing of the contents with timestamps is available in the video description.