Processing velocity information in an ultrasonic system

Details Processing velocity information in an ultrasonic system Processing velocity information in an ultrasonic system

1995-12-18

1997-05-13

Manuel, George

Surgery

Truss

Pad

A61B 800

Patent

active

056283210

ABSTRACT:
A method and apparatus in an ultrasonic system for determining an optimum cardiac cycle of a living subject, and for performing vascular measurements. Peak velocities of a spectra of echoes over a period of time due to pulses emitted into a subject under examination are determined. Based upon the peak velocities of the spectra over the period of time, a time series of the peak velocities are determined representing an optimum cardiac cycle. In addition, vascular measurements of the peak velocities for the optimum cardiac cycle can be determined from the optimum cardiac cycle. The peak velocities of the spectra can be performed by dividing the spectra in a plurality of regions according to ranges of the velocity information. A threshold magnitude of the peak velocities is determined by adding a predetermined value to a minimum magnitude. The threshold magnitude is used to find a peak velocity by searching for the peak velocity from a Nyquist velocity of the spectra, identifying a first velocity which has an magnitude exceeding the threshold magnitude, and using the first velocity as the peak velocity. Determining the optimum cardiac cycle of the living subject includes setting a threshold velocity identifying each the peak velocities which exceed the threshold to form a set of candidate peak velocities. Discontinuities in the set of candidate peak velocities are determined, and the optimum cardiac cycle can be determined therefrom. Various vascular measurements for the optimum cardiac cycle include the peak systole (PS) end diastole (ED), include a minimum diastolic deflection (MDD), a rise time, an acceleration index, a pulsatility index, or a resistivity index.

REFERENCES:
patent: 5139020 (1992-08-01), Koestner et al.
patent: 5409010 (1995-04-01), Beach et al.
patent: 5462059 (1995-10-01), Ferrara et al.

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