MULTI-DIRECTIONAL SCATTERING MODELS FOR 3D ULTRASOUND
U. Z. Ijaz, R. J. Housden, G. M. Treece, R. W. Prager, and A. H. Gee.
An ultrasound image is created from back-scattered echoes originating both from diffuse and directional scattering. It is potentially useful to separate these two components for the purpose of tissue characterization. This paper presents several models for visualization of scattering fields in 3D ultrasound. By scanning the same anatomy from multiple directions, we can observe the variation of specular intensity as a function of viewing angle. This paper considers two models for estimating the di®use and specular components of the backscattered intensity: a modification of the well-known Phong re°ection model and an existing exponential model. We examine 2D implementations and also propose novel 3D extensions of these models in which the probe is not constrained to rotate within a plane. Both simulation and experimental results show that improved performance can be achieved with 3D models.
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