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By Frederic L. Lizzi, D. Jackson Coleman, Jack Driller (auth.), A. J. Berkhout, J. Ridder, L. F. van der Wal (eds.)

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Zone near to the explosive and the rate of decay must be greater than w 2 The low cut is determined by the geometry and is proportional to the shear modulus of the medium and inversely proportional to the radius of the non49 • linear zone. The volume of the nonlinear zone is proportional to the mass of the explosive. Therefore both ends of the spectrum are limited by frequencies which are inversely proportional to the cube root of the mass of the explosive. ACKNOWLEDGEMENT I wish to thank my colleague Jacob Fokkema for many helpful discussions concerning this work.

89, 490-499, 1980. , "Therapeutic Ultrasound in the Treatment of Glaucoma, Part I: Experimental Model," Ophthalmology, 92:339-346, 1985. , "Therapeutic Ultrasound in the Treatment of Glaucoma, Part II: Clinical Applications," Ophthalmology, 92:347-353, 1985. L. , "Effect of Hyperthermia on Experimental Choroidal Melanoma," Br. J. , (in press). L. , "Proton Beam Irradiation and Hyperthermia Effects on Experimental Choroidal Melanoma," Arch. , (in press). , Rosado, A. and Nguyen, H. , "Treatment of Experimental Lens Capsular Tears with Intense Focused Ultrasound," Br.

The two point diffractors in fig. 1b). By decreasing the duration of the acoustic pulse the vertical resolution is improved (pulse compression). This is accomplished by deconvolution. In figure 2a the influence of deconvolution is shown on the response of the two vertically displaced point diffractors of figure lb. Note the improvement in vertical resolution. In this paper we will show that vertical resolution is defined by absolute temporal bandwidth. g. the two point diffractors in fig. 1C). The inverse scattering process improves the lateral resolution.

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