基于脉冲激光二极管辐射源的光声成像系统  

Photoacoustic Imaging System Based on a Pulsed Laser Diode Excitation

作　　者：曾吕明[1] 刘国栋[1] 杨迪武[2] 纪轩荣 

机构地区：[1]江西科技师范大学光电子与通信省重点实验室,江西南昌330038 [2]湖南工业大学理学院,湖南株洲412000 [3]广州多浦乐电子科技有限公司,广东广州510663

出　　处：《中国激光》2013年第B12期106-111,共6页Chinese Journal of Lasers

基　　金：国家科技支撑计划（2012BAIl3801）、江西省科技支撑计划（2009BSAl2700、20132BBG70033）、江西省教育厅科技计划（GJJl3581）、广州市珠江科技新星专项（121700095）、江西科技师范大学校级重点课题（Ky2012zz05）

摘　　要：采用具有价格低、体积小、结构紧凑、重复率高等优点的脉冲激光二极管，搭建了一套C扫描模式的光声成像系统，并采用三维可视化光声重建技术，获得了被测样品的二维和三维光声影像。实验中，系统采用前向模式接收光声信号，激光二极管和超声探测器保持相对位置不变。实验结果表明，该成像系统横向分辨率为0．5mm，光声信噪比可达20．6dB，A扫描速度为0．16s／div。该激光二极管的单脉冲能量低至14砧，整体体积只有10cm×3cm×3cm，有望发展成为一种低成本、实时、便携式的生物组织无损光声成像系统。A C-scanning photoacoustic imaging system is designed with a pulsed laser diode, which has the properties of low cost, small size, compact structure, and high repetition frequency. The 3D-visual reconstruction algorithm is employed to observe the 2D and 3D photoacoustic image. During the experiments, the laser diode and the ultrasonic transducer keep the fixed positions using a front side detection configuration. The experimental results show that lateral resolution of the imaging system is determined as 0.5 mm, and the speed of A-scanning is 0.16 s/div with a signal-to-noise ratio of 20.6 dB. The laser diode is only 10 cm× 3 cm X 3 cm with a pulse energy output as low as 14 μJ. The proposal method has the potential to be developed as a configuration of inexpensive, real-time, and portable noninvasive photoacoustic imaging system for biomedical tissue.

关 键 词：生物光学 光声成像 脉冲激光二极管 三维图像重建 

分 类 号：O436[机械工程—光学工程]