Signal processors in duplex sonography: in vitro comparison between analog and digital methods |
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Authors: | W G Zoller C Wierscher D R Wagner |
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Institution: | 1. Medizinische Poliklinik, Universit?t München, Pettenkoferstrasse 8a, W-8000, München 2, Germany
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Abstract: | Using a new flow-test phantom, which respects the acoustic properties of real blood as well as the proximal and distal impedances
of body circulation, we assessed the performance of two duplex sonography signal processors on blood-flow measurements. With
both the analog and the dynamic signal processor (Fast Fourier Transform), the correlation between duplex sonography and quantitative
flow measurements was high (0.96–0.99) for different dynamic conditions (steady or pulsatile blood flow, varying heart rate,
blood pressure, and hematocrit) and for different mechanical conditions (silicon tube or animal vessel). The real blood flow
was overestimated by duplex sonography the over-estimation was more pronounced with the analog processor (factor 1.87–4.20)
than with the digital processor (factor 1.22–1.64,P<0.05). Applied to the study of asymmetric stenoses, the digital processor was not superior to the analog processors described
in the literature. |
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Keywords: | Duplex sonography Signal processors Fast Fourier Transform (FFT) Flow-test phantom |
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