Medical ultrasound imaging system with velocity-dependent reject

Details Medical ultrasound imaging system with velocity-dependent reject Medical ultrasound imaging system with velocity-dependent reject

1987-11-12

1989-07-25

Jaworski, Francis

Surgery

Truss

Pad

A61B 508

Patent

active

048503649

ABSTRACT:
A medical Doppler ultrasound imaging system with improved filtering to separate blood flow information from clutter due to heart wall and vessel motion. In combination with a clutter rejection filter and velocity determination system as in the prior art, a velocity sample rejection system implements a velocity-dependent (i.e., frequency-dependent) threshold for rejecting velocity values, or samples, based on too weak echoes. That is, the acceptance/rejection threshold is a function of frequency. Optimally, the shape of the velocity-dependent thresholding function closely matches that of the attenuation transfer function of the clutter rejection filter. Thuys, for low velocity samples (corresponding to low Doppler frequency shifts), the rejection threshold is substantially lower than it is for high velocity samples. The rejection level increases monotonically as the signal deviates from the I.F.

REFERENCES:
patent: 4593700 (1986-06-01), Hayakawa et al.
patent: 4612937 (1986-09-01), Miller
patent: 4641668 (1987-02-01), Namekawa
patent: 4660565 (1987-04-01), Shirasaka

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