Skip to Content

Medical Physics Seminar – Monday, December 09, 2013

Advanced spectral analysis methods for quantification of coherent ultrasound scattering: applications in the breast

Ivan Rosada-Mendez (student of Dr. James Zagzebski)
Research Assistant, Department of Medical Physics, UW-School of Medicine & Public Health, Madison, WI - USA -

Parametric images depicting the spatial variability of acoustic properties of tissue aim at increasing the specificity and objectivity of ultrasound as a technique for detecting and diagnosing diseases. Estimation methods for most of these properties are based on the assumption that echo signals are stationary and that underlying scattering sources have no spatial organization, conditions that are consistent with incoherent scattering. However, this is not always the rule in biological tissue because of the presence of large scale interfaces and/or subresolution scatterers that present some level of organization.

This work aims at creating parametric images quantifying the coherence that originates in these scenarios. A Generalized Spectrum approach to measure coherence is optimized for this purpose. A reference-phantom approach is developed to evaluate statistical significance of the detected coherence and to define the nature of its source. Results of a preliminary in vivo application of these procedures to classify breast tumors are presented.

Location: 1345 (HSLC) Health Science Learning Center, 750 Highland Avenue, Madison, WI 53705

Time: 4:00pm-5:00pm

Copyright © 2011 The Board of Regents of the University of Wisconsin System