Abstract
Average differential scattering cross section is obtained from measurements by a normalization that accounts for temporal waveforms and spatial apertures. A model is employed to express the average differential scattering cross section as a linear combination of the power spectrum of the medium compressibility variations, the power spectrum of density variations, and the cross power spectrum of compressibility and density variations. Since the scale factors depend on scattering angle and temporal frequency, known values of the average differential scattering section at different scattering angles and temporal frequencies corresponding to the same spatial frequency, which is considered to be the argument of the average differential scattering cross section and the power spectra, are used to calculate each of the three power spectra. Results are shown for model random media and calf liver. The results indicate that determinations of average differential scattering cross sections and the power spectra of scattering medium variations can be made under practical conditions and also imply that density variations contribute significantly to scattering by calf liver. [Work supported by NSF, NIH, NATO, and Industrial Associates.]
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