Browsing by Issue Date, starting with "2005-12-01"
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- Adaptive system for blood flow estimationPublication . da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Leiria, A.; Ruano, M. GraçaAdaptive estimation of blood flow signals is performed resorting to a framework developed to support research on Doppler blood flow signals' analysis. Real time spectral estimation methods, real time performance evaluation and run-time adjustment of the estimation methods parameters are bound together allowing the system to adapt itself to varying signal characteristics that are caused by physiological reasons.
- Time, time-frequency and displacement-frequency analysis of embolic signalsPublication . Leiria, A.; da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Ruano, M. Graça; Evans, D. H.The characteristics of a new method, the displacement-frequency representation, prompted the study of its use for the analysis of embolic blood flow signals. This paper reports the comparison of displacement-frequency and time-frequency methods with time domain methods, in the characterization of emboli. The study was performed on clinical signals derived from gaseous and particulate embolic events. The results obtained with the different approaches were compared. The conclusions of this study provide encouragement for the use of displacement-frequency domain processing for this kind of analysis.