Surgery – Truss – Pad
Patent
1986-06-30
1987-08-04
Howell, Kyle L.
Surgery
Truss
Pad
A61B 1000
Patent
active
046838937
ABSTRACT:
In an ultrasonic diagnostic system the invention utilizes the concept that for pulse echo medical ultrasound signals the mean instantaneous frequency estimates are improved by imposing the condition that a local frequency estimate is ignored unless a condition of the amplitude exceeding some threshold is met. It provides for the use of conditional frequency or zero crossing rate measurement as applied to ultrasound attenuation measurement and also to local frequency shift measurement due to frequency dependent scattering. The system simultaneously detects the amplitude of the signal, delays the RF waveform to satisfy causality and then conditionally accepts the frequency demodulated image only when a preselected amplitude is exceeded. The system requires that the amplitude of the instantaneous RF signal exceed a set threshold in order for the half cycle of the signal to be processed. It then uses a threshold comparator which causes a track and hold signal to hold during the period when the RF signal amplitude is below the threshold and which tracks the RF signal when its amplitude exceeds the threshold.
REFERENCES:
patent: 4512196 (1985-04-01), Barnes
patent: 4515163 (1985-05-01), Flax et al.
patent: 4605008 (1986-08-01), Ferrari
Cannon, Jr. James J.
Haken Jack E.
Howell Kyle L.
Jaworski Francis J.
North American Philips Corporation
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