Detection light dual-mode imaging system of integrating non-contact photoacoustics and optical coherence tomography

Abstract

The invention discloses a detection light dual-mode imaging system of integrating non-contact photoacoustics and optical coherence tomography. The system includes a computer, a photoacoustic excitation module, a common detection end module, a common reference arm module, a sample arm module, a photoacoustic imaging data acquisition module and an OCT detection module; a detection light signal passes through a second focusing lens, an X-Y scanning galvanometer, a dichroic mirror and a third lens in sequence, and returns to a coupler to conduct interference on light returning from the common reference arm module, and a first interference signal passes through a circulator and the OCT detection module in sequence, and is transmitted to the computer; excitation light emitted by an excitation light source passes through a second reflector, a first focusing lens, a focus adjusting lens andthe dichroic mirror, and is combined with the detection light to form coaxial light, and a second interference signal passes through the circulator, a balance detector and a high-pass filter in sequence, and is transmitted to a data acquisition card. According to the detection light dual-mode imaging system of integrating non-contact photoacoustics and optical coherence tomography, an existing non-contact OCT-PA multimode imaging system is improved, and the system structure is simplified.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to a detection light fusion non-contact photoacoustic-optical coherence tomography dual-mode imaging system. Background technique [0002] In recent years, optical coherence tomography (OCT) and photoacoustic (PA) imaging have become more and more widely used in the field of biomedical imaging. Compared with traditional magnetic resonance imaging (MRI), computed tomography (CT), ultrasonography and other imaging methods, the resolution of the two is higher. OCT is a non-invasive biomedical imaging mode. It obtains tomographic images of biological tissue samples based on reflection and backscattering. The imaging speed is fast, the resolution is high, and the imaging depth is constantly developing. PA imaging requires short-pulse lasers to excite biological tissues, which absorb light and generate photoacoustic signals due to the thermoelastic effect. Ultrasonic transducer...

AI Technical Summary

Problems solved by technology

Multi-channel optical coupling increases the difficulty of optical path adjustment, and optical energy loss will also occur due to coupling efficiency issues

Images