tailieunhanh - Báo cáo hóa học: " Research Article Embedded System for Real-Time Digital Processing of Medical Ultrasound Doppler Signals"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Embedded System for Real-Time Digital Processing of Medical Ultrasound Doppler Signals | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 418235 7 pages doi 2008 418235 Research Article Embedded System for Real-Time Digital Processing of Medical Ultrasound Doppler Signals S. Ricci A. Dallai E. Boni L. Bassi F. Guidi A. Cellai and P. Tortoli Dipartimento Elettronica e Telecomunicazioni Universita degli Studi di Firenze Via S. Marta 3 50139 Firenze Italy Correspondence should be addressed to S. Ricci Received 1 December 2007 Accepted 12 April 2008 Recommended by Chein-I Chang Ultrasound US Doppler systems are routinely used for the diagnosis of cardiovascular diseases. Depending on the application either single tone bursts or more complex waveforms are periodically transmitted throughout a piezoelectric transducer towards the region of interest. Extraction of Doppler information from echoes backscattered from moving blood cells typically involves coherent demodulation and matched filtering of the received signal followed by a suitable processing module. In this paper we present an embedded Doppler US system which has been designed as open research platform programmable according to a variety of strategies in both transmission and reception. By suitably sharing the processing tasks between a state-of-the-art FGPA and a DSP the system can be used in several medical US applications. As reference examples the detection of microemboli in cerebral circulation and the measurement of wall -distension in carotid arteries are finally presented. Copyright 2008 S. Ricci et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The well-known Doppler effect consists in the frequency shift of a wave originated from the relative movement between the source and the receiver. In biomedical ultrasound US .