Abstract:
:Tracking large deformations in tissue using ultrasound can enable the reconstruction of nonlinear elastic parameters, but poses a challenge to displacement estimation algorithms. Such large deformations have to be broken up into steps, each of which contributes an estimation error to the final accumulated displacement map. The work reported here measured the error variance for single-step and accumulated displacement estimates using one-dimensional numerical simulations of ultrasound echo signals, subjected to tissue strain and electronic noise. The covariance between accumulation steps was also computed. These simulations show that errors due to electronic noise are negatively correlated between steps, and therefore accumulate slowly, whereas errors due to tissue deformation are positively correlated and accumulate quickly. For reasonably low electronic noise levels, the error variance in the accumulated displacement estimates is remarkably constant as a function of step size, but increases with the length of the tracking kernel.
journal_name
Ultrason Imagingjournal_title
Ultrasonic imagingauthors
Bayer M,Hall TJdoi
10.1177/0161734613479246subject
Has Abstractpub_date
2013-04-01 00:00:00pages
90-108issue
2eissn
0161-7346issn
1096-0910pii
35/2/90journal_volume
35pub_type
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