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4180790 | Thomas | Dec 1979 | |
4334432 | Gill | Jun 1982 | |
4542653 | Liu | Sep 1985 | |
4550607 | Maslak et al. | Nov 1985 | |
4699099 | Maslak et al. | Oct 1987 | |
5651366 | Liang et al. | Jul 1997 | |
5680863 | Hossach et al. | Oct 1997 | |
5784336 | Gopinathan et al. | Jul 1998 |
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WO 9701768 | Jan 1997 | WO |
Entry |
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Gattzke et al., “Electronic Scanner of a Phased-Array Ultrasound Transducer,” Hewlett-Packard Journal, Dec. 1983, pp. 13-20. |
Prof. Albert Macovski, Medical Imaging Systems, Chapter 10, “Ultrasonic Imaging Using Arrays,” Prentice-Hall, 1983. |