All-optical scanhead for ultrasound and photoacoustic imaging-Imaging mode switching by dichroic filtering.
All-optical scanhead for ultrasound and photoacoustic imaging-Imaging mode switching by dichroic filtering.
复制标题
DOI：
10.1016/j.pacs.2013.12.002
复制
发表时间：
2014-03
期刊：
影响因子：
7.9
通讯作者：
Li, Pai-Chi
中科院分区：
文献类型：
--
作者：
Hsieh, Bao-Yu;Chen, Sung-Liang;Ling, Tao;Guo, L Jay;Li, Pai-Chi
超声（US）和光声（PA）多模态成像具有良好的声学分辨率和高光学对比度的优点。对于两种成像模式使用全光学扫描头可以简化两个系统的集成，并使成像扫描头小型化。在此，我们提出并演示了一种全光学US/PA扫描头，该扫描头使用薄板用于光声成像，聚合物微环谐振器用于声检测，以及通过改变激光波长在两种成像模式之间切换的二向色滤波器。采用合成孔径聚焦技术提高了图像的分辨率和对比度。仿真图像验证了该设计的可行性，并表明轴向和横向分辨率分别达到125 μm和2.52°。
Ultrasound (US) and photoacoustic (PA) multimodality imaging has the advantage of combining good acoustic resolution with high optical contrast. The use of an all-optical scanhead for both imaging modalities can simplify integration of the two systems and miniaturize the imaging scanhead. Herein we propose and demonstrate an all-optical US/PA scanhead using a thin plate for optoacoustic generation in US imaging, a polymer microring resonator for acoustic detection, and a dichroic filter to switch between the two imaging modes by changing the laser wavelength. A synthetic-aperture focusing technique is used to improve the resolution and contrast. Phantom images demonstrate the feasibility of this design, and show that axial and lateral resolutions of 125 μm and 2.52°, respectively, are possible.