Self-adaptive focusing photoacoustic endoscope based on light-transmittable sound-transmittable water sac and implementation method thereof

Abstract

The invention discloses a self-adaptive focusing photoacoustic endoscope based on a light-transmittable sound-transmittable water sac and an implementation method thereof. The endoscope comprises a probe module, a control module and a display module; the probe module comprises the water sac, an annular hollow ultrasonic transducer, an optical component, a rotary shaft, an outer sleeve pipe and a handle, wherein the optical component comprises a glass column, a reflector with the angle of 45 degrees, a varifocal lens, a collimating lens and an optical fiber, the outer sleeve pipe injects waterinto the water sac through a water injection channel, and the probe is controlled to rotate by a motor and an electric slip ring contained in the handle; the control module comprises a motor drive, alaser drive, a varifocal lens drive and a data acquisition card; the display module comprises a computer. According to the self-adaptive focusing photoacoustic endoscope based on the light-transmittable sound-transmittable water sac and the implementation method, through flexible matching of the water sac and an enteric cavity in an irregular shape, by means of the photoacoustic signals of the water sac itself, the border of the enteric cavity is precisely determined, so that the multilayer structures of each circle of the intestinal wall at different angles are on the focus when the probe scans all around at 360 degrees, and an image with high resolution and high contrast is obtained.

Description

technical field [0001] The invention belongs to the technical field of non-destructive imaging, and in particular relates to a photoacoustic endoscope based on a light-transmitting and sound-transmitting water bladder for self-adaptive focusing and a realization method. Background technique [0002] Photoacoustic imaging is a new type of imaging technology developed in recent years. Its basic principle is to irradiate the biological tissue with pulsed laser light. The light absorption domain of the tissue generates an ultrasonic signal due to instantaneous thermal expansion. Processing and image reconstruction yields a distribution of light energy deposition inside the sample. Photoacoustic imaging reflects the difference in the absorption of light by different substances. [0003] There are two types of existing photoacoustic endoscopes. One has a fixed optical focal length. This device has low imaging resolution due to the irregular shape of the cavity and the fact that t...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that when imaging a cavity with irregular shape, complex layer structure and thickness of a few millimeters, such as the rectum, the strongest signal may be in the superficial (3mm) of the intestinal wall. ), so that each frame of the reconstructed image will be defocused, reducing image resolution and contrast

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