Measuring and testing – Vibration – By mechanical waves
Patent
1993-11-01
1996-10-29
Oda, Christine K.
Measuring and testing
Vibration
By mechanical waves
364508, G01N 2904
Patent
active
055698530
ABSTRACT:
An ultrasonic measuring apparatus that includes an ultrasonic transducer for emitting ultrasonic pulses at a predetermined repetition frequency towards an object having a plurality of walls such as a blood vessel, receiving echoes reflected from such walls, and producing an echo signal having a plurality of elementary echo components (E.sub.ant, E.sub.post). A digitizer digitizes the echo signal into a series of digital values that are stored in a buffer memory under control of a circuit. A computer transfers the series of digital values stored in the buffer memory into a memory. The computer is programmed to process the digital values stored in the memory in the period between consecutive pulses and to remove a group of the digital values digitized between consecutive elementary components (E.sub.ant, E.sub.post) from those digital values to be treated between such consecutive pulses.
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Noninvasive measurement of arterial diameters in humans using ultrasound echoes with prefiltered waveforms, Medical And Biological Engineering And Computing, vol. 25, No. 2, Mar. 1987, Stevenage GB, pp. 189-194.
Asulab S.A.
Oda Christine K.
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