By Topic

Effective shear modulus reconstruction obtained with approximate mean normal stress remaining unknown

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Sumi, Chikayoshi ; Sophia Univ., Tokyo

We previously reported methods A and B for reconstructing tissue shear modulus and density using mean normal stress as an unknown. The use of method A enables us to obtain such reconstructions with the mean normal stress remaining unknown by using an iterative method to solve algebraic equations. However, method A results in a low convergence speed and a low reconstruction accuracy compared with method B that enables a reconstruction of mean normal stress together. Thus, in this report, we describe a new, rapid and accurate method, method C, that enables the reconstructions of shear modulus and density in real time with a higher accuracy than method A. In method A, no reference mean normal stress is used. In method C, an arbitrary finite value is used as a quasireference mean normal stress at an arbitrary point (i.e., a quasireference point) or an arbitrary region (i.e., a quasireference region) in the region of interest on the basis of the fact that the gradient operator implemented on the mean normal stress becomes positive-definite. When a quasireference region can be realized, method C enables such reconstructions with a high accuracy and a high convergence speed similar to method B. The effectiveness of method C was verified using simulated phantom deformation data. Method C must be used instead of method A as a practical method, in combination with method B.

Published in:

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:54 ,  Issue: 11 )