{'fraction_non_alphanumeric': 0.023450586264656615, 'fraction_numerical': 0.005862646566164154, 'mean_word_length': 5.675977653631285, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
INTERNATIONAL CONGRESS ON ACOUSTICS MADRID , 2-7 SEPTEMBER 2007 Doppler Ultrasound Blood Flow Measurement System

This work describes a Doppler ultrasound system for measuring blood flow. The system is intended to be used in coronary implants and bypasses. Quantifying the blood flow through these implants/bypasses is an important task to ensure the chirurgical process, thus, reducing both the post-chirurgical and death risks. The system on an open architecture that is portable and low-cost, incorporating the advantages of expensive systems with dedicated hardware. The system incorporates a pulsed-wave bi-directional Doppler ultrasound flow detector working at 8 MHz. Signal conditioning, direction detection, signal processing, spectrogram displaying, parameters calculation, and a database handling subsystem complete the system. A graphical user interface is provided for controlling and monitoring the whole system. Doppler signal is processed using both Fourier Transform-based and Parametric Model-based algorithms, having the facility to incorporate alternative higher-resolution spectral estimation methods. The system is being assessed in coronary implant and bypass operations.