Method for maintaining a constant velocity to color map in an ul

Details Method for maintaining a constant velocity to color map in an ul Method for maintaining a constant velocity to color map in an ul

1998-02-18

1999-04-06

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600453, 600454, A61B 800

Patent

active

058910409

ABSTRACT:
The method of the invention employs pulsed Doppler ultrasound signals to color image blood and tissue movement velocities in a body. The method initially images a movement with a transmitted ultrasound signal that manifests a current signal transmission frequency value and a current pulse repetition frequency (PRF) value. Those values exhibit a determined ratio R to each other. Thereafter, in response to an indication by the user that movement is to be imaged at a new depth, the method alters the current transmission frequency to a new frequency to provide improved signal back-scatter from movement at the new depth. Then, the current PRF is adjusted, automatically, to a new PRF value which, when compared to the new transmission frequency, manifests substantially the same determined ratio R that was present between the current transmission frequency and current PRF. The latter step assures that the mapping of movement velocity values to colors is maintained, notwithstanding use of a new transmission frequency.

REFERENCES:
patent: 3883871 (1975-05-01), Moore
patent: 4794933 (1989-01-01), Yamazaki
patent: 4799490 (1989-01-01), Namekawa
patent: 4819652 (1989-04-01), Micco
patent: 5107841 (1992-04-01), Sturgill
patent: 5549111 (1996-08-01), Wright et al.
patent: 5709209 (1998-01-01), Friemel et al.

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