Figure 5.

Focusing results in the phantom with an optical thickness of 50 with the 2.0 MHz HIFU transducer. (a) Photograph of the sample dissected at the middle plane, which contains two absorbing objects (Obj 1 and Obj 2, absorption coefficient μ_a = 0.80 mm⁻¹, scattering coefficient μ_s = 10 mm⁻¹, and scattering anisotropy g = XX) and one scattering object (Obj. 3, scattering coefficient μ_s = 50 mm⁻¹ and scattering anisotropy g = XX). The widths of the three objects were 1.4, 1.2, and 3.3 mm, respectively, and their lengths and thicknesses were all 6.1 and 0.7 mm, respectively. (b) Normalized TRUE images as a function of phantom position along the x direction.