title: Off-axis scattering of an ultrasound bessel beam by a sphere.
abstract: In this paper, the scattering of an ultrasound zero-order Bessel beam by a rigid sphere in the off-axis configuration is studied. The beam is described through the partial wave expansion. The beam-shape coefficients which represent the amplitude of each multipole mode of the partial wave expansion are computed by numerical quadrature. Calculations are presented for both near- and far-field off-axis scattering. The far-field scattering is examined in both Rayleigh and geometrical acoustic limits. Results demonstrate that the scattered pressure in the off-axis case may significantly deviate from that in the on-axis configuration. In addition, the directive pattern of the scattered pressure is highly dependent on the relative position of the beam to the sphere.
authors.affiliation: Instituto de Fisica, Universidade Federal de Alagoas, Maceio, AL, Brazil. glauber@pq.cnpq.br
authors.forename: Glauber T
authors.initials: GT
authors.lastname: Silva
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical; D012542:Scattering, Radiation; D014463:Ultrasonography