基于声透镜的三维同时光声层析成像技术

The three-dimensional simultaneous photoacoustic tomography imaging technique based on acoustic lens

提出了一种能实现连续分布物体的三维同时光声层析成像的新方法,利用一个具有二维并行成像能力而且具有较大焦深的声透镜,把一个三维物体并行成像在声透镜的像面上.由于声透镜具有较大焦深,可以把不同物面的光声信号准确成像在同一像面.根据成像系统的正弦定理,同一物面所产生的光声信号同时到达像面,而不同物面所产生的光声信号需要不同的时间到达同一像面,由于光速远大于声速,因此可以利用时间分辨技术实现三维物体的同时光声层析成像.实验结果表明,该成像系统可以同时获得三维物体的不同层面的层析图像.

A new three-dimensional simultaneous photoacoustic （PA） tomography imaging technique with continuous objects is put forward. With the long focal depth and the parallel imaging ability of acoustic lens, we can image in a three-dimensional objects simultaneously. Because the acoustic lens has long focal depth, the imaging system can acquire the complete PA signals from all the object planes and image accurately in the same image plane. According to the law of sine＇s imaging system, the PA signals of the same object plane will reach the image plane synchronously; however, the PA signals of different object planes will reach the same image plane at different time. As the speed of light is much greater than the speed of sound, the method of the simultaneous PA tomography imaging in three-dimensional objects could be achieved by utilizing the time-resolved technique. The experimental results show that this imaging system can obtain the tomography images simultaneously at different levels of three-dimensional objects.