用于超声成像的阵列式光纤传感系统研究

Fiber-optic array sensing system for ultrasound imaging

光学超声成像是一种新型的医学成像技术,相比于传统超声成像技术具有更高的分辨率和更高的对比度。目前,光学超声成像通常以单传感器采集超声信号,使用机械扫描视场进行超声成像,但这会导致相对较长的扫描时间和较低的帧速度。为了解决这一问题,提出了基于法布里-珀罗(Fabry-Pérot,F-P)干涉和激光多普勒测振两种原理的阵列式光纤超声传感系统,使用多个光纤传感单元并行采集处理信号来实现快速光学超声成像。搭建传感系统并进行超声传感实验,结果显示F-P干涉系统的灵敏度更高,实现了10 fps的成像速度,而激光多普勒测振系统更适合全部通道并行传感,成像速度为100 fps。研究实现了快速光学超声成像,这开创了光纤传感系统用于并行超声传感的先河,这在无损检测和生物医学超声成像方面具有巨大潜力。

Optical ultrasound imaging is a new medical imaging technique that offers higher resolution and higher contrast than conventional ultrasound imaging techniques.Currently,optical ultrasound imaging typically acquires ultrasound signals with a single transducer and uses a mechanical scanning field of view for ultrasound imaging.However,this leads to relatively long scan times and low frame speeds.To solve this problem,this paper proposes an arrayed fiber-optic ultrasound sensing system based on both Fabry-Pérot(F-P)interference and laser Doppler vibrometry principles.Multiple fiber-optic sensing units are used to acquire and process signals in parallel to achieve fast optical ultrasound imaging.The sensing systems are built and ultrasound sensing experiments are performed.The results show that the F-P interferometric system has higher sensitivity and achieves an imaging speed of 10 frames per second.The laser Doppler vibrometry system is more suitable for parallel sensing of all channels,with an imaging speed of 100 frames per second.This study achieves fast optical ultrasound imaging,which pioneers the use of fiber-optic sensing systems for parallel ultrasound sensing.This has great potential for non-destructive testing and biomedical ultrasound imaging.