Adaptive temporal filtering to enhance fluid flow or tissue moti

Details Adaptive temporal filtering to enhance fluid flow or tissue moti Adaptive temporal filtering to enhance fluid flow or tissue moti

1997-04-09

1999-05-04

Jaworski, Francis J.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600453, A61B 800, A61B 806

Patent

active

058998640

ABSTRACT:
The energy, power or amplitude of Doppler or time shift information signals is compared to a threshold in order to select a large or small weighting factor for temporal persistence. In the event of a "flash" signal or strong arterial flow signal, a small weighting factor is chosen to reduce the extent of temporal persistence via feedback of the averaged value for the prior frames so that the effect of the "flash" or strong flow signal would quickly dissipate in the imaging of subsequent frames and good temporal resolution preserved for the current frames, while low energy flow signals would cause a large weighting factor to be selected to improve the signal-to-noise ratio of low energy signals. Similar effects can be achieved by clipping the signals to not exceed a certain threshold.

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