title: Tiny endoscopic optical coherence tomography probe driven by a miniaturized hollow ultrasonic motor.
abstract: 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.
authors: Tsinghua University, Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Beijing 100084, China.
authors: Tianyuan
authors: T
authors: Chen
authors: Ning
authors: N
authors: Zhang
authors: Tiancheng
authors: T
authors: Huo
authors: Chengming
authors: C
authors: Wang
authors: Jing-gao
authors: JG
authors: Zheng
authors: Tieying
authors: T
authors: Zhou
authors: Ping
authors: P
authors: Xue
mesh_terms: D019723:Endoscopes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D019220:High-Energy Shock Waves; D007089:Image Enhancement / Q000295:instrumentation*; D007909:Lenses; D008029:Lighting / Q000295:instrumentation*; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D008904:Miniaturization; D009038:Motion; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012666:Semiconductors; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000295:instrumentation*; D014159:Transducers