Recent advances in blood flow vector velocity imaging

Jørgen Arendt Jensen, Svetoslav Nikolov, Jesper Udesen, Peter Munk, Kristoffer Lindskov Hansen, Mads Møller Pedersen, Peter Møller Hansen, Michael Bachmann Nielsen, Niels Oddershede, Jacob Kortbek, Michael Johannes Pihl, Ye Li

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Abstract

A number of methods for ultrasound vector velocity imaging are presented in the paper. The transverse oscillation (TO) method can estimate the velocity transverse to the ultrasound beam by introducing a lateral oscillation in the received ultrasound field. The approach has been thoroughly investigated using both simulations, flow rig measurements, and in-vivo validation against MR scans. The TO method obtains a relative accuracy of 10% for a fully transverse flow in both simulations and flow rig experiments. In-vivo studies performed on 11 healthy volunteers comparing the TO method with magnetic resonance phase contrast angiography (MRA) revealed a correlation between the stroke volume estimated by TO and MRA of 0.91 (p<;0.01) with an equation for the line of regression given as: MRA = 1.1 · TO-0.4 ml. Several clinical examples of complex flow in e.g. bifurcations and around valves have been acquired using a commercial implementation of the method (BK Medical ProFocus Ultraview scanner). A range of other methods are also presented. This includes synthetic aperture imaging using either spherical or plane waves with velocity estimation performed with directional beamforming or speckle tracking. The key advantages of these techniques are very fast imaging that can attain an order of magnitude higher precision than conventional methods. SA flow imaging was implemented on the experimental scanner RASMUS using an 8-emission spherical emission sequence and reception of 64 channels on a BK Medical 8804 transducer. This resulted in a relative standard deviation of 1.2% for a fully transverse flow. Plane wave imaging was also implemented on the RASMUS scanner and a 100 Hz frame rate was attained. Several vector velocity image sequences of complex flow were acquired, which demonstrates the benefits of fast vector flow imaging. A method for extending the 2D TO method to 3D vector velocity estimation is presented and the implications for future vector velocity imagi- g is indicated.

Original languageEnglish
Title of host publication2011 IEEE International Ultrasonics Symposium
PublisherIEEE
Publication date2011
Pages262 - 271
ISBN (Print)978-1-4577-1253-1
DOIs
Publication statusPublished - 2011
Event2011 IEEE International Ultrasonics Symposium - Caribe Royale, Orlando, FL, United States
Duration: 18 Oct 201121 Oct 2011
http://ewh.ieee.org/conf/ius_2011/

Conference

Conference2011 IEEE International Ultrasonics Symposium
LocationCaribe Royale
Country/TerritoryUnited States
CityOrlando, FL
Period18/10/201121/10/2011
Internet address

Keywords

  • Apertures
  • Estimation
  • Image color analysis
  • Imaging
  • Oscillators
  • Ultrasonic imaging
  • Vectors

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