This is the second of two papers which present the fundamental concepts and terminology of acoustical scattering theory in a manner suitable for use by those involved in ultrasonic tissue characterization. The first paper [1] dealt with scattering by single objects. The present paper discusses scattering by collections of objects, including statistical aspects of scattering and the theory of the index of refraction for ultrasonic waves.
ChiversR. C., Ultrasound in Medicine and Biology, 3, 1–13 (1977).
3.
NicholasD., in Recent Advances in Ultrasound in Biomedicine, Vol. I, WhiteD. N., ed. (Research Studies Press, Forest Grove, Oregon, 1977).
4.
VezzettiD. J.KellerJ. B., J. Math. Phys., B, 1861–1870 (1967).
5.
For illustrations of the use of these equations in the electromagnetic case see [4] andVaradanV. K., BringiV. N., and VaradanV. V., Phys. Rev. D, 19, 2480–2489 (1979). For the elastic case, see VaradanV. K., VaradanV. V., and PaoY-H., J. Acoust. Soc. Amer., 63, 1310-1319 (1977).
6.
For standard definitions of the distribution functions ű(n) see Davidson, N., Statistical Mechanics, Chap. 20 (McGraw-Hill, New York, 1962).
