Incorporating tissue absorption and scattering in rapid ultrasound beam modeling

Douglas Christensen; Scott Almquist

doi:10.1117/12.2008021

26 February 2013 Incorporating tissue absorption and scattering in rapid ultrasound beam modeling

Douglas Christensen, Scott Almquist

Proceedings Volume 8584, Energy-based Treatment of Tissue and Assessment VII; 85840X (2013) https://doi.org/10.1117/12.2008021
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

We have developed a new approach for modeling the propagation of an ultrasound beam in inhomogeneous tissues such as encountered with high-intensity focused ultrasound (HIFU) for treatment of various diseases. This method, called the hybrid angular spectrum (HAS) approach, alternates propagation steps between the space and the spatial frequency domains throughout the inhomogeneous regions of the body; the use of spatial Fourier transforms makes this technique considerably faster than other modeling approaches (about 10 sec for a 141 x 141 x 121 model). In HIFU thermal treatments, the acoustic absorption property of the tissues is of prime importance since it leads to temperature rise and the achievement of desired thermal dose at the treatment site. We have recently added to the HAS method the capability of independently modeling tissue absorption and scattering, the two components of acoustic attenuation. These additions improve the predictive value of the beam modeling and more accurately describes the thermal conditions expected during a therapeutic ultrasound exposure. Two approaches to explicitly model scattering were developed: one for scattering sizes smaller than a voxel, and one when the scattering scale is several voxels wide. Some anatomically realistic examples that demonstrate the importance of independently modeling absorption and scattering are given, including propagation through the human skull for noninvasive brain therapy and in the human breast for treatment of breast lesions.

Citation Download Citation

Douglas Christensen and Scott Almquist "Incorporating tissue absorption and scattering in rapid ultrasound beam modeling", Proc. SPIE 8584, Energy-based Treatment of Tissue and Assessment VII, 85840X (26 February 2013); https://doi.org/10.1117/12.2008021

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