Speckle decorrelation due to two-dimensional flow gradients.

Journal Article

The performance of ultrasonic velocity estimation methods is degraded by speckle decorrelation, the change in received echoes over time. Because ultrasonic speckle is formed by the complex sum of echoes from subresolution scatterers, it is sensitive to the relative motion of those scatterers. Velocity gradients in flowing blood result in relative scatterer motion and can be a significant source of speckle decorrelation. Computer simulations were performed to evaluate speckle decorrelation due to two-dimensional flow gradients. Results indicate that decorrelation due to flow gradients is sensitive to the angle of flow and has a maximum at a beam-vessel angle of 0 degrees , i.e., purely axial flow. A quantitative summary of the major factors causing speckle decorrelation indicates that flow gradients are the most significant contributors under the conditions modeled.

Full Text

Duke Authors

Cited Authors

  • Friemel, BH; Bohs, LN; Nightingale, KR; Trahey, GE

Published Date

  • January 1, 1998

Published In

Volume / Issue

  • 45 / 2

Start / End Page

  • 317 - 327

PubMed ID

  • 18244183

International Standard Serial Number (ISSN)

  • 0885-3010

Digital Object Identifier (DOI)

  • 10.1109/58.660142

Language

  • eng

Conference Location

  • United States