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Ultrasound Med Biol. 2013 Oct;39(10):1760-70. doi: 10.1016/j.ultrasmedbio.2013.04.009. Epub 2013 Jul 9.

Tomographic reconstruction of tissue properties and temperature increase for high-intensity focused ultrasound applications.

Author information

  • 1Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611-6131, USA.

Abstract

The acoustic and thermal properties as well as the temperature change within a tissue volume during high-intensity focused ultrasound ablation are critically important for treatment planning and monitoring. Described in this article is a tomographic reconstruction method used to determine the tissue properties and increase in temperature in a 3-D volume. On the basis of the iterative finite-element solution to the bioheat equation coupled with Tikhonov regularization techniques, our reconstruction algorithm solves the inverse problem of bioheat transfer and uses the time-dependent temperature measured on a tissue surface to obtain the acoustic absorption coefficient, thermal diffusivity and temperature increase within the subsurface volume. Numerical simulations were performed to validate the reconstruction algorithm. The method was initially conducted in ex vivo experiments in which time-dependent temperature on a tissue surface was measured using high-resolution, non-invasive infrared thermography.

2013 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved

KEYWORDS:

Bioheat equation; High-intensity focused ultrasound; Image reconstruction; Infrared thermography

PMID:
23849388
[PubMed - indexed for MEDLINE]
PMCID:
PMC3789063
Free PMC Article
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