Geometry of the problem when the acoustic source has the form of a spherical cap with a circular central opening.
(Color online) Spatial distributions in the plane of the amplitude of the incident pressure wave (top), the radiation force axial component (middle), and the lateral component (bottom) when the sphere is positioned on the axis for the source shown in Fig. 1 . The image box size is 20 × 10 mm. Note the sphere is included for scale and is not in fact fixed in only the shown position.
(Color online) Spatial distributions in the plane of the full acoustic pressure at time for different positions of the 2-mm spherical stone. The lateral coordinate of the stone center is marked in the left-upper corner of each image, and the colors denote pressure magnitudes. An arrow shows the radiation force direction and relative magnitude. The image box size is 20 × 10 mm. The incident beam axis is directed to the right.
Axial distribution of pressure amplitude (top) and normalized radiation force for different radii of the scatterer. Solid lines represent calculations based on the full model, while dotted lines correspond to the low-frequency approximation, Eq. (85) .
Geometry of the problem in the case of a linear array source. The focal point can be steered within the imaging plane y = 0.
(Color online) Spatial distributions in the plane (left column) and plane (right column) of the amplitude of the incident pressure wave (upper), the radiation force axial component (center), and lateral component (lower left) and (lower right) for the 5-MHz source shown in Fig. 5 . The target diameter 2 = 2 mm is shown by the dotted white circles in the top plots. The image box size is 6 × 4 mm.
(Color online) Spatial distribution in the plane of the radiation force for the same parameters used in Fig. 6 . The force magnitude is plotted by color. The force direction is shown by the white arrows.
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