| 摘要 |
PURPOSE: A method and an apparatus for adapting operation of imaging system based on pixel intensity histogram are provided to optimize operating parameters in response to the occurrence of predetermined changes in a pixel intensity histogram of successive image frames in an ultrasonic imaging system. CONSTITUTION: An ultrasound imaging system comprises a transducer array(2), a beam-former(4), a B-mode image processor(6), a computer(8) and a display monitor(10). The transducer array(2) comprises a multiplicity of transducer elements which are activated by a transmitter in beam-former(4) to transmit an ultrasound beam focused at a transmit focal position. The return RF signals are detected by the transducer elements and then dynamically focused at successive ranges along a scan line by a receiver in beam-former(4) to form a receive vector of raw acoustic data samples. The beam-former output data (I/Q or RF) for each scan line is passed through a B-mode image processor(6), which processes the raw acoustic data into pixel image data in a format suitable for display by the display monitor(10). The computer(8) is programmed to re-optimize a set of operating parameters automatically in response to detection of the following conditions: (a) the N most recent image frames have pixel intensity histograms which are stabilized; and (b) the (N+1)-th and the N-th most recent image frames have pixel intensity histograms which are different to at least a pre-stored degree.
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