Abstract
We designed and implemented a magnetic-driven scanning (MDS) probe for endoscopic optical coherence tomography (OCT). The probe uses an externally-driven tiny magnet in the distal end to achieve unobstructed 360-degree circumferential scanning at the side of the probe. The design simplifies the scanning part inside the probe and thus allows for easy miniaturization and cost reduction. We made a prototype probe with an outer diameter of 1.4 mm and demonstrated its capability by acquiring OCT images of ex vivo trachea and artery samples from a pigeon. We used a spectrometer-based Fourier-domain OCT system and the system sensitivity with our prototype probe was measured to be 91 dB with an illumination power of 850 μW and A-scan exposure time of 1 ms. The axial and lateral resolutions of the system are 6.5 μm and 8.1 μm, respectively.
Highlights
The last two decades have witnessed rapid development of the high-resolution biomedical imaging modality, optical coherence tomography (OCT) [1, 2], and associated endoscopic probes [3, 4]
The designs of side-imaging probes can be categorized into two patterns
Proximal rotation is implemented by rotating the whole probe with actuation located at the proximal end
Summary
The last two decades have witnessed rapid development of the high-resolution biomedical imaging modality, optical coherence tomography (OCT) [1, 2], and associated endoscopic probes [3, 4]. Most popular distal-rotation probes are implemented by placing a micromotor [7,8,9] or micro-electromechanical system (MEMS) [10, 11] attached with a micromirror at the distal end of the probe. In these cases, the probe size will be determined by the state-of-the-art of miniaturization of micromotor or MEMS devices. One usual problem in the micromotor-based distal-rotation probes is that the electric wire used for driving the motor will block the light at some scanning angle and introduce wire shadows in the OCT image [14]
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