Biophysics / Internet Invited Lecture

ELASTICITY MAPPING OF TISSUE MIMICKING PHANTOMS BY REMOTE PALPATION WITH A FOCUSED ULTRASOUND BEAM AND INTENSITY AUTOCORRELATION MEASUREMENTS

C Usha Devi, R S Bharat Chandran, R M Vasu and A K Sood
Indian Institute of Science, Bangalore, India

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ABSTRACT

We use a focused ultrasound beam to load a region of interest (ROI) in a tissue-mimicking phantom and read out the vibration amplitude of phantom particles from the modulation depth in the intensity autocorrelation of a coherent light beam that intercepted the ROI. The modulation depth, which is also affected by the local light absorption coefficient, which is employed in ultrasound, assisted optical tomography to read out, absorption coefficient is greatly influenced by the vibration amplitude, depends to a great extend on local elasticity. We scan a plane in an elastography phantom with an inhomogeneous inclusion in elasticity, with the focused ultrasound and from the measured modulation depth variations create a qualitative map of the elasticity variation in the interrogated plane.

Representing Author:

C.Usha Devi, Indian Institute of Science, Research Scholar (Bangalore, India)

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DEDICATION:

DEDICATION:

SFM 2006 is dedicated to the memory of Professor Mark L. Katz on the 100 anniversary of his birth and the 60th anniversary of the Chair of Optics and Biomedical Physics founded by him in 1946 in Saratov State University.