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A multiple scattering analysis in a nonviscous fluid is developed in detail in order to predict the coherent sound motion in the presence of disordered heterogeneities, such as particles, fibers, bubbles, or contrast agents. Scatterers can be homogeneous, layered, shell-like with encapsulated liquids or gas, nonabsorbing, or absorbing, and can take a wide(More)
A new high intensity focused ultrasound (HIFU) probe has been designed and tested by using MRI. The probe is intended to be used by physicians to correct valvular dysfunction in the saphenous vein, which is known to be the cause of superficial venous insufficiency (SVI) and varicose veins. Treating SVI with HIFU is possible, since venous tissue undergoes(More)
Atrial septal defect (ASD) is a common congenital heart defect with a reported incidence of 1.0/1000 live births. Untreated ASD can cause right ventricular overload with right heart failure, atrial arrhythmias, systemic embolism, pulmonary hypertension, and premature death. During the past 15 years, transcatheter closure of isolated secundum ASD has become(More)
The effective dynamic properties of composites made of elastic cylindrical fibers randomly distributed in another elastic solid can be evaluated with plane shear-horizontal acoustic waves. In this paper, it is shown that the effective mass density and the effective shear stiffness are complex valued and frequency dependent. Simple formulas are derived for(More)
Atrial septal defect (ASD) is a common congenital heart defect with a reported incidence of 1.0/1000 live births. Untreated ASD can cause right ventricular overload with right heart failure, atrial arrhythmias, systemic embolism, pulmonary hypertension, and premature death. During the past 15 years, transcatheter closure of isolated secundum ASD has become(More)
A result, which does not appear to be available elsewhere, concerning the far-field scattering of antiplane waves by a single thin crack in an elastic solid is obtained in this letter. Specifically, the angular shape function is derived, with scattering coefficients expressed in terms of the crack-opening displacement. With this function, numerical values(More)
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