Ultraharmonic imaging method and device based on photoinduced ultrasonic effect

Abstract

The invention discloses an ultraharmonic imaging method and device based on a photoinduced ultrasonic effect. The method comprises the following steps of converting a received pulse signal produced bya signal generator into an optical acoustic signal by a transmission energy converter comprising a carbon nanotube array; and enabling a receiving energy converter to receive an echo signal obtainedby the reflecting of the optical acoustic signal through a microbubble contrast agent in a blood vessel, and extracting three or more ultraharmonic signals in the echo signal, wherein the ultraharmonic signals are in one-to-one correspondence to the position distribution of microbubbles. According to the method disclosed by the invention, through detecting the distribution of the microbubbles, imaging the outline of the blood vessel is realized. The device comprises a signal transmitting module formed by first optical fibers and a carbon nanotube array film, a signal receiving module and a signal treating module. According to the ultraharmonic imaging method based on the photoinduced ultrasonic effect provided by the invention, the positions of the microbubbles in the blood vessel can be reflected through utilizing the three or more ultraharmonic signals in the echo signal reflected by the carbon nanotube array film, and the part of the ultraharmonic signals is three or more times of the frequency of a fundamental wave signal, so that the image resolution ratio can be effectively improved.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and more specifically relates to a superharmonic imaging method and device for photoinduced ultrasonic effects. Background technique [0002] Ultrasound medical imaging is one of the main inspection methods of modern medical imaging diagnosis. It has the advantages of real-time imaging, non-invasiveness, and low cost. It has incomparable advantages in the detection of human soft tissue and cardiovascular, and is widely used. The ultrasonic transducer is used as an ultrasonic emission source to emit ultrasonic waves to scan human tissues and organs. The acoustic impedance of different imaging media is different, which leads to differences in echo ultrasonic signals. The back-end imaging system uses this difference in acoustic impedance. The signal is imaged. [0003] At present, the most commonly used ultrasonic transducers are based on piezoelectricity. However, the ultrasonic signals genera...

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to propose a superharmonic imaging method based on the photoinduced ultrasonic effect, aiming at solving the problems of insufficient imaging resolution and low imaging depth of the optical fiber photoacoustic imaging method

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