Method and device for measuring acoustic impedance of living body based on ultrasound steady state reflection wave

Abstract

The invention relates to a method for measuring the acoustic impedance of an organism based on ultrasound steady state reflected waves, which comprises that (1) multiple frequency continuous baseband signals which are mutually orthometric are structured by using orthogonal frequency division multiplexing modulation mode; (2) an ultrasonic probe sends out the multiple frequency continuous baseband signals; (3) an ultrasound transducer detects reflected state echo signals; and finally the amplitude of reflected waves of a no uniform reflecting interface and phase difference opposite to incident waves are found out by solving equations set. A device realizing the method comprises an ultrasonic probe, a control unit, a transceiving unit, a processing unit and a display element which are respectively connected with the control unit. The ultrasonic probe is connected with the transceiving unit. The processing unit is respectively connected with the transceiving unit and the display element. The method has high calculation accuracy, good anti-interference, good anti-noise capability. Only one probe is needed, thus causing that the cost of development devices is reduced. And the measuring method is simple and can be used in vivo experiment.

Description

technical field [0001] The present invention relates to electronic technology and ultrasonic application technology, in particular to a method of constructing mutually orthogonal continuous multi-frequency ultrasonic signals by means of Orthogonal Frequency Division Multiplexing (OFDM) modulation, and measuring the steady-state reflected echoes of the multi-frequency ultrasonic signals A method and device for measuring biological acoustic impedance based on ultrasonic steady-state reflected waves to obtain acoustic impedance of different tissues of the biological body using signals. Background technique [0002] In recent years, due to the advantages of low cost, no ionizing radiation, easy operation, fast detection speed, and easy portability, ultrasonic technology has been used in the measurement of biological tissues, especially in the measurement of human bone density (bone mineral density) related indicators, and the determination of osteoporosis. The disease standard h...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a method based on ultrasound to solve the defects of the existing method, such as large measurement errors and limitations, the inability to measure the essential parameters (acoustic impedance or density) reflecting the density of biological tissues, and the need for a probe for sending and receiving, and high cost. The measurement method of the biological acoustic impedance of the steady-state reflected wave, by measuring the steady-state reflected echo signal of the multi-frequency ultrasonic signal to obtain the acoustic impedance of different tissues of the living body, the method uses the orthogonal frequency division multiplexing (OFDM) modulation method To construct mutually orthogonal continuous multi-frequency ultrasonic signals, and obtain the acoustic impedance of different tissues of the organism by measuring the steady-state reflection echo signals of the multi-frequency ultrasonic signals

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