Efficient focusing scheme for transverse velocity estimation using cross-correlation

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Abstract

The blood velocity can be estimated by cross-correlation of received RE signals, but only the velocity component along the beam direction is found. A previous paper showed that the complete velocity vector can be estimated, if received signals are focused along lines parallel to the direction of the flow. Here a weakly focused transmit field was used along with a simple delay-sum beamformer. A modified method for performing the focusing by employing a special calculation of the delays is introduced, so that a focused emission can be used. The velocity estimation was studied through extensive simulations with Field II. A 64-elements, 5 MHz linear array was used. A parabolic velocity profile with a peak velocity of 0.5 m/s was considered for different angles between the flow and the ultrasound beam and for different emit foci. At 60 degrees the relative standard deviation was 0.58 % for a transmit focus at 40 mm. For 90 degrees the new approach gave a relative standard deviation of 8.3 % with a focus at 40 mm and 8.0 % at a transmit focus of 150 mm. Pulsatile flow in the femoral artery was also simulated. A purely transverse flow profile could be obtained with a relative standard deviation of less than 10 % over the whole cardiac cycle, which is sufficient to show clinically relevant transverse color flow images.
Original languageEnglish
Title of host publicationMedical Imaging 2001 : Ultrasonic Imaging and Signal Processing
Volume4325
Publication date2001
Pages242-256
ISBN (Print)0-8194-4011-6
DOIs
Publication statusPublished - 2001
EventSPIE Medical Imaging 2001 - San Diego, CA, United States
Duration: 18 Feb 200122 Feb 2001

Conference

ConferenceSPIE Medical Imaging 2001
CountryUnited States
CitySan Diego, CA
Period18/02/200122/02/2001
SeriesProceedings of S P I E - International Society for Optical Engineering
Number30
Volume2
ISSN0277-786X

Keywords

  • Medical imaging
  • Blood velocity
  • Ultrasound
  • Transverse velocity estimation

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