Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10692960 | Ultrasound in Medicine & Biology | 2005 | 10 Pages |
Abstract
Experimental and computer simulation methods have been used to investigate the significance of beam steering as a potential source of error in pulsed-wave flow velocity estimation. By simulating a typical linear-array transducer system as used for spectral flow estimation, it is shown that beam steering can cause an angle offset resulting in a change in the effective beam-flow angle. This offset primarily depends on the F-number and the nominal steering angle. For example, at an F-number of 3 and a beam-flow angle of 70°, the velocity error changed from â5% to + 5% when the steering angle changed from â20° to + 20°. Much higher errors can occur at higher beam-flow angles, with smaller F-numbers and greater steering. Our experimental study used a clinical ultrasound system, a tissue-mimicking phantom and a pulsatile waveform to determine peak flow velocity errors for various steering and beam-flow angles. These errors were found to be consistent with our simulation results. (E-mail: cobbold@ecf.utoronto.ca)
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Acoustics and Ultrasonics
Authors
Aaron H. Steinman, Alfred C.H. Yu, K. Wayne Johnston, Richard S.C. Cobbold,