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Ultrasound CT can be used to estimate maps of the sound speed and acoustic absorption. The frequency-dependence of absorption in biological tissue empirically follows a power-law with a non-integer exponent. Such behaviour can be incorporated into the wave equation as a term depending on a fractional time derivative or a fractional Laplacian. The latter has computational advantages. The use of this model in full-wave inversions for both the sound speed and absorption will be described.
This presentation is part of Minisymposium “MS77 - Advances in Ultrasound Tomography (2 parts)”
organized by: Jennifer Mueller (Colorado State University) , Raul Gonzalez Lima (Universidade de São Paulo) .