Surgery – Truss – Pad
Patent
1989-06-13
1991-07-02
Jaworski, Francis
Surgery
Truss
Pad
73625, A61B 800
Patent
active
050278215
ABSTRACT:
In the ultrasonic imaging apparatus according to the present invention, ultrasonic transducers provided in a probe for corresponding channels are driven and caused to propagate ultrasonic waves by a standard signal generating circuit, transmission delay circuits and pulsers. Then, receiving signals obtained from the ultrasonic transducers are delayed in an analog manner by analog delay circuits. The resulting delayed signals are A/D converted by analog/digital converters. The outputs of the A/D converters are delayed in a digital manner by digital delay circuits composed of semiconductor memory elements. The resulting delayed outputs are summed by a summing circuit. The output of the summing circuit is detected. Predetermined imaging data is produced based on the detected output and displayed. In order to enhance delay precision of the analog/digital converters and digital delay circuits, the delay amount of the analog delay circuits can be continuously varied in small steps.
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U.S. patent application Ser. No. 07/246,105, Hirama et al.
Hirama Makoto
Hongo Hironobu
Jaworski Francis
Kabushiki Kaisha Toshiba
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