Ultrasound color flow extended velocity estimation

Details Ultrasound color flow extended velocity estimation Ultrasound color flow extended velocity estimation

1993-11-26

1994-11-15

Manuel, George

Surgery

Truss

Pad

12866108, 7386125, A61B 800

Patent

active

053638514

ABSTRACT:
A multi-lag method for estimating both high and low velocities of blood flow from a single set of firings in situations where both high-velocity and low-velocity signals are of interest. A color flow processor uses multiple lags in the firing sequence. The normal lag of unity is used for high-velocity estimation; lags greater than unity are used for low-velocity estimation. A normal firing sequence is set up with a pulse repetition frequency that allows accurate velocity estimation of the highest flow velocity that the operator expects. This sequence yields data that is appropriately wall filtered, and a high-velocity estimate is made by correlation over adjacent firings, that is, firings 1 and 2, 2 and 3, 3 and 4, and so on, to the end of the packet, are respectively correlated. The same data is then used to provide a low-velocity estimate. The correlation is calculated between firings that are spaced by multiple units of the pulse repetition interval, e.g., by correlating firings 1 and 3, 2 and 4, 3 and 5, and so on.

REFERENCES:
patent: 5190044 (1993-03-01), Kawasaki et al.
patent: 5211169 (1993-05-01), Freeland
patent: 5291892 (1994-03-01), O'Donnell

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