Surgery – Truss – Pad
Patent
1996-09-17
1997-07-15
Jaworski, Francis
Surgery
Truss
Pad
12866108, A61B 800
Patent
active
056473664
ABSTRACT:
A method and system of processing Doppler data includes determining a noise component independently of automatic signal analysis. A succession of frequency spectra is formed in response to receiving reflected energy from an object of interest. A Doppler waveform is then derived from the succession of frequency spectra. The execution of noise estimation is limited to time periods between peaks of the Doppler waveform, providing a first level of isolation from the true-signal processing. Implementation of the noise estimation is based upon portions of the frequency spectra that are independent of the portions from which the Doppler waveform is derived. This provides a second level of isolation. The determined noise component is used as a threshold level in subsequent derivation of the Doppler waveform. Preferably, there are multiple noise thresholds that are adaptively utilized to permit application of a short search block during Doppler frequency detection.
REFERENCES:
patent: 5271404 (1993-12-01), Corl et al.
patent: 5287753 (1994-02-01), Routh et al.
Larry Y.L. Mo et al., "Comparison of Four Digital Maximum Frequency Estimators for Doppler Ultrasound," Ultrasound in Med. & Biol., vol. 14, No. 5, pp. 355-363, 1988.
Fields Derrick
Jaworski Francis
Siemens Medical Systems Inc.
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