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Multigate Transcranial Doppler Ultrasound System with real-Time Embolic Signal Identification and Archival

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journal contribution
posted on 30.07.2007, 11:15 by L. Fan, P. Tortoli, D.H. Evans
An integrated system for acquisition and processing of intracranial and extracranial Doppler signals and automatic embolic signal detection has been developed. The hardware basis of the system is a purpose-built acquisition/processing board that includes a multigate Doppler unit controlled through a computer. The signal-processing engine of the system contains a fast Fourier transform (FFT)-based, spectral-analysis unit and an embolic signaldetection unit using expert system reasoning theory. The system is designed so that up to four receive gates from a single transducer can be used to provide useful reasoning information to the embolic signal-detection unit. Alternatively, two transducers can be used simultaneously, either for bilateral transcranial Doppler (TCD) investigations or for simultaneous intra- and extracranial investigation of different arteries. The structure of the software will allow the future implementation of embolus detection algorithms that use the information from all four channels when a single transducer is used, or of independent embolus detection in two sets of two channels when two transducers are used. The user-friendly system has been tested in-vitro, and it has demonstrated a 93.6% sensitivity for micro-embolic signal (MES) identification. Preliminary in-vivo results also are encouraging.

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Citation

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2006, 53 (10), pp.1853-1861.

Published in

IEEE Transactions on Ultrasonics

Publisher

IEEE

Available date

30/07/2007

Notes

This is the article as published by IEEE and available at their website www.ieee.org

Language

en

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