ADAPTIVE TEMPORAL FILTERING TO ENHANCE IMAGE OF BODY FLUID FLOW OR TISSUE MOTION

摘要

PROBLEM TO BE SOLVED: To provide an improved type adaptive temporal filtering system of which the characteristic is raised.;SOLUTION: The energy, power or amplitude of Doppler or time shift information signals is compared to a threshold value in order to select a large or small weighting factor for temporal persistence. In the event of a "flash" signal or strong arterial blood 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 quickly dissipates during the imaging of subsequent frames, and good temporal resolution is preserved for the current frames. For low energy flow signals, a large weighting factor is 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 prescribed threshold value.;COPYRIGHT: (C)2006,JPO&NCIPI