基于增强倏逝波的声透镜光声成像系统设计

光声成像是一种新近迅速发展起来、基于生物组织内部光学吸收差异、以超声作媒介的无损生物光子成像方法。在分析当前光声成像系统中传统声学透镜的倏逝波衰减导致包含图像细节的高频信息丢失的基础上,提出使用负折射透镜,让倏逝波参与成像,突破传统声学透镜的衍射极限,从而大幅提高成像分辨率。同时依据光声效应产生的超声波具有波的特性,在研究中还发展、完善了声学信息系统的相关理论以及三维声成像技术。通过实验对比得到了超越普通声学透镜的生物组织的光声成像效果。

Based on the enhancement of evanescent wave acousticlens photoacoustic imaging system design

As a new nondestructive biophotonic technology, taking the ultrasonic wave as the media, opto-acoustic tomography is a kind of imaging method based on the differences of optical absorption within the biological organization. With an analysis on the loss of the high-frequency information containing image details resulted from the decay of the evanescent wave in the traditional acoustic lens in the current opto-acoustic tomography system, a study is conducted in this paper by using the lens with negative refractive index to make the evanescent wave participate in the imaging process, and break through the diffraction limit of the traditional acoustic lens, so as to greatly improve the resolution of image. Moreover, according to the characteristics of ultrasonic wave produced in opto-acoustic effect, the relevant theory of acoustic information system and three-dimensional acoustic imaging technology are supplemented and developed in the study. In addition, a set of comparative experiment is done on the imaging effect between the traditional lens and the lens designed in this paper, and the experiment shows that the imaging effect of opto-acoustic tomography within the biological organization got by the designed lens greatly beyond that of the traditional lens.