Conference Proceedings

Quadratic time-scale detection of microemboli in flowing blood with Doppler ultrasound

BS Krongold, AM Sayeed, M Moehring, JA Ritcey, M Spencer, DL Jones

Proceedings of SPIE - The International Society for Optical Engineering | Published : 1997

Abstract

Small formed elements and gas bubbles in flowing blood, called microemboli, can be detected using pulse Doppler ultrasound. In this application, a pulsed constant-frequency ultrasound signal insonates a volume of blood in the middle cerebral artery, and microemboli moving through this sample volume produce a Doppler shifted transient reflection. Current detection methods include searching for these transients in a short-time Fourier transform (STFT) of the reflected signal. However, since the embolus transit time through the Doppler sample volume is inversely proportional to the embolus velocity (Doppler shift frequency), a matched-filter detector should in principle use a wavelet transform,..

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