Phased array ultrasonic beam time -space characteristics affect the image quality directly.Anew beam time-space control method, basd on fuzzy control theory, is proposed in thispaper. As. a result, the electric focal length and aperture can vary dynamically with echosignal, and the quality of phased array B-mode ultrasonic image is improved effectively. Thismethod initiates the application of fuzy control theory in medical ultrasonic field.
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