Attenuation Constant

The following table contains values for the acoustic attenuation of all tissues and includes statistical information on the standard deviation and the spread in the values. 

For attenuation, a frequency dependence of the form α=α₀*f^b is assumed, where α (Np/m) is the absorption coefficient for a given frequency f, α₀ (Np/m/Hz) is a medium constant, and b is also a numerical constant dependent on the tissue type. In the absence of information (e.g., data points that permit fitting) b is assumed to be 1. For the attenuation relationship, the parameters α and b are obtained by fitting the available data. Whenever a source provides a frequency dependence over a given frequency range, that function is sampled throughout the interval, with a ratio between neighboring frequencies of 1.2 to provide data points for the fit.

  Frequency Hz kHz MHz GHz  Go  Export