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Handheld Laser Scanning Microscope Catheter for Real-time and Confocal Microscopy Using a High Definition High Frame Rate Lissajous MEMS Mirror

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Specialty Radiology
Date 2022 Apr 13
PMID 35414975
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Abstract

A handheld confocal microscope using a rapid MEMS scanning mirror facilitates real-time optical biopsy for simple cancer diagnosis. Here we report a handheld confocal microscope catheter using high definition and high frame rate (HDHF) Lissajous scanning MEMS mirror. The broad resonant frequency region of the fast axis on the MEMS mirror with a low Q-factor facilitates the flexible selection of scanning frequencies. HDHF Lissajous scanning was achieved by selecting the scanning frequencies with high greatest common divisor (GCD) and high total lobe number. The MEMS mirror was fully packaged into a handheld configuration, which was coupled to a home-built confocal imaging system. The confocal microscope catheter allows fluorescence imaging of and mouse tissues with 30  frame rate and 95.4% fill factor at 256 × 256 pixels image, where the lateral resolution is 4.35 μ and the field-of-view (FOV) is 330 × 330 . This compact confocal microscope can provide diverse handheld microscopic applications for real-time, on-demand, and optical biopsy.

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