Ultrahigh resolution endoscopic spectral domain optical coherence tomography with a tiny rotary probe driven by a hollow ultrasonic motor

Ning Zhang; Tianyuan Chen; Tiancheng Huo; Chengming Wang; Jing-gao Zheng; Tieying Zhou; Ping Xue

doi:10.1117/12.2001829

20 March 2013 Ultrahigh resolution endoscopic spectral domain optical coherence tomography with a tiny rotary probe driven by a hollow ultrasonic motor

Ning Zhang, Tianyuan Chen, Tiancheng Huo, Chengming Wang, Jing-gao Zheng, Tieying Zhou, Ping Xue

Author Affiliations +

Proceedings Volume 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII; 85713A (2013) https://doi.org/10.1117/12.2001829
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

This paper proposes a novel rotary endoscopic probe for spectral-domain optical coherence tomography (SD-OCT). The probe with a large N.A. objective lens is driven by an ultra-small hollow rectangular ultrasonic motor for circular scanning. Compared to the conventional driven techniques, the hollow ultrasonic motor enables the fiber to pass through its inside. Therefore the fiber, the objective lens and the motor are all at the same side. This enables 360 degree unobstructed imaging without any shadow resulted from power wire as in the conventional motor-driven endoscopic OCT. Moreover, it shortens the length of the rigid tip and enhances the flexibility of the probe. Meanwhile, the ultrasonic motor is robust, simple, quiet and of high torque, very suitable for OCT endoscopic probe. The side length of the motor is 0.7 mm with 5mm in length. The outer diameter of the probe is 1.5mm. A significant improvement in the lateral resolution is demonstrated due to the novel design of the objective lens. A right-angle lens is utilized instead of the traditional right-angle prism as the last optics close to the sample, leading to a reduction of the working distance and an enlargement of the N.A. of the objective lens. It is demonstrated that the endoscopic SD-OCT system achieves an axial resolution of ~7μm, a lateral resolution of ~6μm and a SNR of ~96dB.

Citation Download Citation

Ning Zhang, Tianyuan Chen, Tiancheng Huo, Chengming Wang, Jing-gao Zheng, Tieying Zhou, and Ping Xue "Ultrahigh resolution endoscopic spectral domain optical coherence tomography with a tiny rotary probe driven by a hollow ultrasonic motor", Proc. SPIE 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII, 85713A (20 March 2013); https://doi.org/10.1117/12.2001829

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KEYWORDS

Endoscopy

Optical coherence tomography

Ultrasonics

Objectives

Signal to noise ratio

Image resolution

Point spread functions

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