Liao Wenchao, Chen Tianyuan, Wang Chengming, Zhang Wenxin, Peng Zhangkai, Zhang Xiao, Ai Shengnan, Fu Deyong, Zhou Tieying, Xue Ping
Opt Lett. 2017 Oct 15;42(20):4040-4043. doi: 10.1364/OL.42.004040.
We present a focus-adjustable endoscopic probe for optical coherence tomography (OCT), which is able to acquire images with different focal planes and overcome depth-of-focus limitations by image fusing. The use of a two-way shape-memory-alloy spring enables the probe to adjust working distance over 1.5 mm, providing a large scanning range with high resolution and no sensitivity loss. Equipped with a homemade hollow-core ultrasonic motor, the probe is capable of performing an unobstructed 360 deg field-of-view distal scanning. Both the axial resolution and the best lateral resolution are ∼4 μm, with a sensitivity of 100.3 dB. Spectral-domain OCT imaging of phantom and biological tissues with the probe is also demonstrated.
我们展示了一种用于光学相干断层扫描（OCT）的焦点可调式内窥探头，它能够获取不同焦平面的图像，并通过图像融合克服焦深限制。双向形状记忆合金弹簧的使用使探头能够在超过1.5毫米的范围内调节工作距离，提供大扫描范围、高分辨率且无灵敏度损失。该探头配备了自制的空心超声电机，能够进行360°无阻碍的远端视野扫描。轴向分辨率和最佳横向分辨率均约为4μm，灵敏度为100.3dB。还展示了使用该探头对体模和生物组织进行的光谱域OCT成像。
