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15 November 1978 High Resolution Dynamic Ultrasonic Imaging
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"Dynamic" imaging of superficial body organs has increased the diagnostic capabilities of ultrasound. A linear array clinical system has been developed to provide dynamic, high-resolution examinations. This system provides a simultaneous wide-range gray scale B-mode image and calibrated A-mode image on the same display. Use of a TV monitor allows full gray scale representation of the 45 dB echo amplitude range after appropriate logarithmic amplification. The A-mode is presented immediately below the B-mode display and represents the echo amplitude information along the central axis. The ultrasonic probe in the instrument contains a linear array of 35 elements which makes direct contact with the skin. Electronic scanning is performed by custom-made multi-plexers in the probe at a 60 frame per second rate. Push-buttons in the hand-held probe allow for remote frame-freezing, photographic documentation or control of a videotape recorder. The 32 scan lines of the individual transducer elements are expanded to 256 lines on the video display using electronic interpolation to provide a smooth, full B-mode image without streaking, and television crispening techniques used on the ultrasonic signals sharpen the image. A microprocessor in the system aids in controlling system function and simplifies the operational controls adjusted by the physician.
© (1978) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. T. Walker, A. L. Susal, and J. D. Meindl "High Resolution Dynamic Ultrasonic Imaging", Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978);


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