图像分辨率
物理
镜头(地质)
图像质量
医学
导管
作者
Jiefeng Xi,Li Huo,Yicong Wu,Michael J. Cobb,Joo Ha Hwang,Xingde Li
出处
期刊:Optics Letters
[The Optical Society]
日期:2009-07-01
卷期号:34 (13): 1943-1945
被引量:56
摘要
We report new optics designs for an optical coherence tomography (OCT) balloon imaging catheter to achieve diffraction-limited high resolution at a large working distance and enable the correction of severe astigmatism in the catheter. The designs employed a 1 mm diameter gradient-index lens of a properly chosen pitch number and a glass rod spacer to fully utilize the available NA of the miniature optics. Astigmatism caused by the balloon tubing was analyzed, and a method based on a cylindrical reflector was proposed and demonstrated to compensate the astigmatism. A catheter based on the new designs was successfully developed with a measured diffraction-limited lateral resolution of ~21 μm, a working distance of ~11-12 mm, and a round-shape beam profile. The performance of the OCT balloon catheter was demonstrated by 3D full-circumferential imaging of a swine esophagus in vivo along with a high-speed, Fourier-domain, mode-locked swept-source OCT system.
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