Question

The wave velocity of ultrasound in soft tissues is 1540m/s and the impedance offered by it is 1.63 X 106 kg/m^2s. What is the density of the soft tissue?

(a) 0.1058441 kg/m^3

(b) 10.58441 kg/m^3

(c) 1058.441kg/m^3

(d) 105844.1 kg/m^3

This question was posed to me in class test.

My query is from Ultrasound in portion Diagnostic Investigation via Imaging Techniques of Clinical Science

Answer 1

Correct choice is (c) 1058.441kg/m^3

Explanation: The impedance is given by  z = ρc where z = impedance, ρ = density and c = velocity of the ultrasound. Since the wave velocity and the impedance offered are given, ρ = z/c. This results in 1058.441 kg/m^3 of density for the soft tissue.