"the physical density of the tissue (d, in kg/m3)"
"Examples of impedance for bodily tissues (in kg/(m2s)):"
"lung 0.18 × 106"
"fat 1.34 × 106"
"water 1.48 × 106"
"kidney 1.63 × 106"
"blood 1.65 × 106"
"liver 1.65 × 106"
"muscle 1.71 × 106"
"bone 7.8 × 106"
"The SI unit for acoustic impedance is the Rayl, kg/(m2s) 3, after J W Strutt, 3rd Baron Rayleigh."
"So, if the density of a tissue increases, impedance increases. Similarly, but less intuitively, if the velocity of sound increases, then impedance also increases."
"Where Z1 and Z2 represent the impedance in tissue 1 and tissue 2, respectively. The signs in this equation are easy to remember because you can't reflect more sound than you originally sent, so the (Z2 - Z1) term must be the numerator."
"Examples of impedance for bodily tissues (in kg/(m2s)):"
"The SI unit for acoustic impedance is the Rayl, kg/(m2s) 3, after J W Strutt, 3rd Baron Rayleigh."
"Z = d x c"
"Reflection fraction = [(Z2 - Z1) / (Z2 + Z1)]2"
"The SI unit for acoustic impedance is the Rayl, kg/(m2s) 3, after J W Strutt, 3rd Baron Rayleigh."
"The SI unit for acoustic impedance is the Rayl, kg/(m2s) 3, after J W Strutt, 3rd Baron Rayleigh."
"The effect of acoustic impedance in medical ultrasound becomes noticeable at interfaces between different tissue types. The ability of an ultrasound wave to transfer from one tissue type to another depends on the difference in impedance of the two tissues. If the difference is large, then the sound is reflected. We grasp this intuitively at a macroscopic level. If you were to yell into a canyon, you would expect an echo to return to you. The sound wave in air meets the dense rocky canyon wall and reverberates off it back to you; the sound wave does not just pass into the rock. This is due to the difference in impedance 3."