Ultrafast Acoustical Imaging with Surface Acoustic Wave Components
A new technique for processing the electric signals resulting from an ultrasound multielement probe has been used to achieve a high rate B-mode imaging system. The images are formed with surface-acoustic-waves (SAW) propagating on a PZT substrate and read out with SAW transducer arrays. The imaging system operation is explained and the configuration of specific SAW components is described. For showing the feasibility of this processing method, experimental results about a 20 parallel channel system are reported. A rate of 800 frames/sec. has been reached for an image made of 1500 uncorrelated points. However more detailed images have been obtained with a frame rate of 400/sec. and a point number of 3000 In this case the resolution is 1 mm in depth and 2.5mm in width.
KeywordsFrame Rate Transducer Array Probe Array Matrix Column Angular Aperture
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