Abstract: A method for determining concentration of at least one component of the material, the method comprising: measuring at least one of the real and imaginary parts of the permittivity of the material at each of a first plurality of frequencies for which substantially only a second plurality of known components of the material contributes to the dielectric permittivity of the material, wherein for each of the known components the permittivity as a function of temperature is known and the first plurality is greater than the second plurality; determining the concentration of at least one of the known components responsive to a solution of a set of simultaneous equations determined by the first plurality of measurements and the dependence of the permittivities of the known components on temperature.

Abstract: A method and apparatus are provided for ultrasound imaging wherein ultrasound imaging data is acquired at points in a plurality of imaging slices and the ultrasound imaging data is used to determine the relative positions of the slices.