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) .

Authors:

Ben Cox (Department of Medical Physics, University College London)

Keywords:

computed tomography, image reconstruction, ultrasound