"The propagation speed of sound waves through tissue is an important element of ultrasound scans. Ultrasound machines assume sound waves travel at a speed of 1540 m/sec through tissue 1. In reality, the speed of sound is affected by the density and elasticity of the medium through which it is travelling and these factors are not constant for human tissues. The propagation speed of sound is higher in tissues with increased stiffness and reduced density2."
"The propagation speed of sound waves through tissue is an important element of ultrasound scans. Ultrasound machines assume sound waves travel at a speed of 1540 m/sec through tissue 1. In reality, the speed of sound is affected by the density and elasticity of the medium through which it is travelling and these factors are not constant for human tissues. The propagation speed of sound is higher in tissues with increased stiffness and reduced density2."