Effects of Nonuniform Acoustic Fields in Vessels and Blood Velocity Profiles on Doppler Power Spectrum and Mean Blood Velocity

• ZHANG Dali

  the Department of Electrical and Electronic Engineering, the University of Tokushima

• HIRAO Yoji

  the Department of Electrical and Electronic Engineering, the University of Tokushima

• KINOUCHI Yohsuke

  the Department of Electrical and Electronic Engineering, the University of Tokushima

• YAMAGUCHI Hisao

  the 1st Department of physiology, school of Medicine, the University of Tokushima

• YOSHIZAKI Kazuo

  the 1st Department of physiology, school of Medicine, the University of Tokushima

Abstract

This paper presents a detailed simulation method to estimate Doppler power spectrum and mean blood velocity using real CW Doppler transducers with twin-crystal arrangement. The method is based on dividing the sample volume into small cells and using the statistics of the Doppler power spectrum with the same Doppler shift frequency, which predicts the mean blood velocity. The acoustic fields of semicircular transducers across blood vessels were calculated and the effects of acoustical and physiological factors on Doppler power spectrum and mean blood velocity were analyzed. Results show that nonuniformity of the acoustic field of the ultrasonic beam in the blood vessel and blood velocity profiles significantly affect Doppler power spectrum and mean blood velocity. However, Doppler angle, vessel depth, and sample volume length are not sensitive functions. Comparisons between simulation and experimental results illustrated a good agreement for parabolic flow profile. These results will contribute to a better understanding of Doppler power spectrum and mean blood velocity in medical ultrasound diagnostics.

Journal

• IEICE trans. on Information and System, D

  IEICE trans. on Information and System, D 85 (9), 1443-1451, 2002-09-01

  The Institute of Electronics, Information and Communication Engineers

Keywords

• continuous-wave Doppler
• semicircular transducer
• acoustic field
• Doppler power spectrum
• mean blood velocity

Details

• CRID: 1573668927255639808
• NII Article ID: 110003210699
• NII Book ID: AA10826272
• ISSN: 09168532
• Text Lang: en
• Data Source:
  • CiNii Articles