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Fast color flow mode imaging using plane wave excitation and temporal encoding

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Keywords
  • In Conventional Ultrasound Color Flow Mode Imaging
  • A Large Number (~500) Of Pulses Have To Be Emitted In Order To Form A Complete Velocity Map
  • This Lowers The Frame-Rate And Temporal Resolution
  • A Method For Color Flow Imaging In Which A Few (~10) Pulses Have To Be Emitted To Form A Complete Ve
  • The Method Is Based On Using A Plane Wave Excitation With Temporal Encoding To Compensate For The De
  • Resulting From The Lack Of Focusing
  • The Temporal Encoding Is Done With A Linear Frequency Modulated Signal
  • To Decrease Lateral Sidelobes
  • A Tukey Window Is Used As Apodization On The Transmitting Aperture
  • The Data Are Beamformed Along The Direction Of The Flow
  • And The Velocity Is Found By 1-D Cross Correlation Of These Data
  • First The Method Is Evaluated In Simulations Using The Field Ii Program
  • Secondly
  • The Method Is Evaluated Using The Experimental Scanner Rasmus And A 7 Mhz Linear Array Transducer
  • Which Scans A Circulating Flowrig
  • The Velocity Of The Blood Mimicking Fluid In The Flowrig Is Constant And Parabolic
  • And The Center Of The Scanned Area Is Situated At A Depth Of 40 Mm
  • A Cfm Image Of The Blood Flow In The Flowrig Is Estimated From Two Pulse Emissions
  • At The Axial Center Line Of The Cfm Image
  • The Velocity Is Estimated Over The Vessel With A Mean Relative Standard Deviation Of 2
  • 64% And A Mean Relative Bias Of 6
  • 91%
  • At An Axial Line 5 Mm To The Right Of The Center Of The Cfm Image
  • The Velocity Is Estimated Over The Vessel With A Relative Standard Deviation Of 0
  • 84% And A Relative Bias Of 5
  • 74%
  • Finally The Method Is Tested On The Common Carotid Artery Of A Healthy 33-Year-Old Male

Abstract

Fast color flow mode imaging using plane wave excitation and temporal encoding - DTU Orbit (19/04/14) Udesen, Jesper; Gran, Fredrik; Jensen, Jørgen Arendt / Fast color flow mode imaging using plane wave excitation and temporal encoding. Proceedings of SPIE Medical Imaging meeting: Ultrasonic Imaging and Signal Processing. Vol. 5750 2005. p. 427-436. Publication: Research - peer-review › Article in proceedings – Annual report year: 2005

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