What determines the acoustic impedance of a material and why is it useful in understanding ultrasound imaging?

Acoustic impedance is the density of a material multiplied by the speed of sound in the material.
Knowing these two values allows use to calculate how much of the sound energy is reflected at an interface between two materials, or two different types of tissue in the body. The greater the difference, the more reflection. This is the reason for the use of coupling gel between the scanner probe and the skin, removing trapped air, to reduce reflection of ultrasound at the skin, by reducing the acoustic impedance difference.

Answered by David A. Physics tutor

7601 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

Name the four fundamental forces.


How would I derive Kepler's third law from Newton's law of gravitation and the equations of circular motion?


A ball is fired at an angle of 50 degrees with a velocity of 10 ms^-1, at what time does it first hit the floor?


Describe and explain the photoelectric effect in terms of photons interacting with the surface of a metal.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences