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Theoretical results are obtained to describe how clinically measured ultrasonic specrral parameters are related to efective physical properties of tissue scatterers. Scatterer morphologies include small asymmetric or isotropic scatterers, thin quasi-cylindrical scatterers, and quasi-planar scatterers. Closed form expressions relate linear-regression spectralparameters to system and analysis factors and to effective scatterer properties including size, concentration, and relative acowtic impedance. Results are being used to guide veryhigh-frequency ultrasonic examinations of ocular tissues.

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