Tsinghua University, Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Beijing 100084, China.
J Biomed Opt. 2013 Aug;18(8):86011. doi: 10.1117/1.JBO.18.8.086011.
We present an endoscopic probe for optical coherence tomography (OCT) equipped with a miniaturized hollow ultrasonic motor that rotates the objective lens and provides an internal channel for the fiber to pass through, enabling 360 deg unobstructed circumferential scanning. This probe has an outer diameter of 1.5 mm, which is ultra-small for motorized probes with an unobstructed view in distal scanning endoscopic OCT. Instead of a mirror or prism, a customized aspheric right-angle lens is utilized, leading to an enlargement of the numerical aperture and thus high transverse resolution. Spectral-domain OCT imaging of bio-tissue and a phantom are demonstrated with resolution of 7.5 μm(axial)×6.6 μm(lateral) and sensitivity of 96 dB.
我们提出了一种配备微型空心超声电机的光学相干断层扫描（OCT）内窥镜探头，该电机可旋转物镜并提供光纤通过的内部通道，实现 360 度无阻碍的圆周扫描。该探头的外径为 1.5 毫米，对于在远端扫描内窥镜 OCT 中具有无阻碍视野的电动探头来说，它是超小的。探头采用定制的非球面直角透镜，而不是镜子或棱镜，这导致数值孔径增大，从而实现高横向分辨率。利用该探头对生物组织和模型进行光谱域 OCT 成像，轴向分辨率为 7.5μm，横向分辨率为 6.6μm，灵敏度为 96dB。
