Ultrasound Doppler diagnostic apparatus

Details Ultrasound Doppler diagnostic apparatus Ultrasound Doppler diagnostic apparatus

1998-07-17

2000-04-18

Kamm, William E.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600454, A61B 800

Patent

active

060509481

ABSTRACT:
A technique is disclosed for accurately tracing a maximum or minimum frequency in each of Doppler-shifted frequency spectra arranged in a sequential order of time on the time axis as an M-mode Doppler image. The maximum or minimum frequency is picked up by thresholding and hence the trace accuracy depends on a threshold. The threshold is determined based on the average brightness of a sample region in which noise is dominant. Therefore, the capability of discriminating between signal and noise components improves, allowing the trace accuracy to be improved.

REFERENCES:
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patent: 5146414 (1992-09-01), McKown et al.
patent: 5287753 (1994-02-01), Routh et al.
patent: 5634465 (1997-06-01), Schmiesing et al.
patent: 5647366 (1997-07-01), Weng
patent: 5935074 (1999-08-01), Mo et al.

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