A transmission coaxial photoacoustic endoscopic probe and its imaging method

Abstract

The invention discloses a transmission coaxial type photoacoustic endoscope probe, which comprises a protruding pipe part with a light outlet opening on the outer peripheral surface of one end; a prism whose mirror surface is opposite to the light outlet is arranged in the protruding pipe part; The axis extending into the pipe fitting is arranged at an angle, and the end of the extending pipe fitting away from the light outlet along the axial direction is movably provided with a light-transmitting acoustic mirror, and the plane of the light-transmitting acoustic mirror is opposite to the passage extending into the pipe fitting and is arranged at an included angle, An ultrasonic transducer is arranged on the side of the translucent acoustic mirror plane with respect to the reflection direction of the sound transmission direction of the channel extending into the pipe fitting, and an optical fiber is arranged on the side of the translucent acoustic mirror away from the protruding pipe fitting. The channels of the pipe fittings are facing each other, and the ultrasonic transducer is connected with the same information processing system. By adopting the above arrangement, the signal-to-noise ratio of the photoacoustic endoscopic probe during imaging can be improved, so as to improve the receiving efficiency of ultrasound, and at the same time, the imaging depth of the endoscopic probe can be improved, thereby achieving the advantage of improving the accuracy of obtaining information on gastrointestinal lesions.

Description

technical field [0001] The invention relates to the technical field of photoacoustic imaging, in particular to a transmission coaxial photoacoustic endoscopic probe and an imaging method thereof. Background technique [0002] Photoacoustic imaging is a new non-invasive and non-ionizing medical imaging method developed in this year. When the pulsed laser is irradiated (thermoacoustic imaging specifically refers to the irradiation with radio frequency pulsed laser) into the biological tissue, the light absorption domain of the tissue will generate an ultrasonic signal, and the signal generated by the light excitation is called the photoacoustic signal . The photoacoustic signal generated by biological tissue carries the light absorption characteristic information of the tissue, and the light absorption distribution image in the tissue can be reconstructed by detecting the photoacoustic signal. [0003] Photoacoustic imaging techniques can be divided into the following catego...

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Problems solved by technology

[0005] As mentioned above, since the prism and the light-transmitting acoustic mirror of the existing photoacoustic coaxial endoscopic probe are located in the same metal outer tube and are set close to the opening of the metal outer tube, the probe will be put into the body as a whole according to actual use needs , such as the digestive tract, so the distance between the prism and the light-transmitting acoustic mirror is small, so the sound wave transmission between the two will cause the noise to increase significantly due to the small distance, and because the ultrasonic transducer is It is directly connected to the external device through the signal line, so the signal of the device has little influence, which leads to a decrease in the signal-to-noise ratio of the photoacoustic coaxial endoscopic probe, resulting in a decrease in the efficiency of ultrasound reception, thereby reducing its imaging efficiency. , which reduces the accuracy of obtaining information on gastrointestinal lesions

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