Two advanced applications of real-time spectral-analysis to pulsed-wave (PW) Doppler systems are reviewed. The proposed approaches tend to overcome two inherent limitations of PW Doppler analysis, i.e. the frequency ambiguity connected to aliasing, and the lack of information obtainable when the moving targets are oriented at 90° to the ultrasound transducer. Experimental tests involving the implementation of a Doppler development board interfaced to a PC were performed. The board is based on a digital signal processor which, running a program under software control of the PC, can perform the fast Fourier transform algorithm at high speed. A noticeable flexibility is thus obtained, since the quadrature Doppler signals are processed according to a user-definable software. Moreover, the clinical evaluation of the new processing techniques is made easier by the fact that the printed circuit board with related software can be installed on board any AT-compatible PC, and interfaced to any directional Doppler instrument.
Advances in spectral-analysis based ultrasound pulsed Doppler systems / P. TORTOLI; G. GUIDI; F. VALGIMIGLI; C. ATZENI. - STAMPA. - 13:(1991), pp. 142-143. (Intervento presentato al convegno Engineering in Medicine and Biology Society, 1991. Vol.13: 1991., Proceedings of the Annual International Conference of the IEEE tenutosi a Orlando, Florida, USA nel 31 Ottobre - 3 Novembre).
Advances in spectral-analysis based ultrasound pulsed Doppler systems
TORTOLI, PIERO;GUIDI, GABRIELE;ATZENI, CARLO
1991
Abstract
Two advanced applications of real-time spectral-analysis to pulsed-wave (PW) Doppler systems are reviewed. The proposed approaches tend to overcome two inherent limitations of PW Doppler analysis, i.e. the frequency ambiguity connected to aliasing, and the lack of information obtainable when the moving targets are oriented at 90° to the ultrasound transducer. Experimental tests involving the implementation of a Doppler development board interfaced to a PC were performed. The board is based on a digital signal processor which, running a program under software control of the PC, can perform the fast Fourier transform algorithm at high speed. A noticeable flexibility is thus obtained, since the quadrature Doppler signals are processed according to a user-definable software. Moreover, the clinical evaluation of the new processing techniques is made easier by the fact that the printed circuit board with related software can be installed on board any AT-compatible PC, and interfaced to any directional Doppler instrument.
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