Automated working distance adjustment for a handheld OCT-Laryngoscope

Sabine Donner; Sebastian Bleeker; Tammo Ripken; Alexander Krueger

doi:10.1117/12.2035790

4 March 2014 Automated working distance adjustment for a handheld OCT-Laryngoscope

Sabine Donner, Sebastian Bleeker, Tammo Ripken, Alexander Krueger

Proceedings Volume 8926, Photonic Therapeutics and Diagnostics X; 892621 (2014) https://doi.org/10.1117/12.2035790
Event: SPIE BiOS, 2014, San Francisco, California, United States

Abstract

Optical coherence tomography (OCT) is an imaging technique which enables diagnosis of vocal cord tissue structure by non-contact optical biopsies rather than invasive tissue biopsies. For diagnosis on awake patients OCT was adapted to a rigid indirect laryngoscope. The working distance must match the probe-sample distance, which varies from patient to patient. Therefore the endoscopic OCT sample arm has a variable working distance of 40 mm to 80 mm. The current axial position is identified by automated working distance adjustments based on image processing. The OCT reference plane and the focal plane of the sample arm are moved according to position errors. Repeated position adjustment during the whole diagnostic procedure keeps the tissue sample at the optimal axial position. The auto focus identifies and adjusts the working distance within the range of 50 mm within a maximum time of 2.7 s. Continuous image stabilisation reduces axial sample movement within the sampling depth for handheld OCT scanning. Rapid autofocus reduces the duration of the diagnostic procedure and axial position stabilisation eases the use of the OCT laryngoscope. Therefore this work is an important step towards the integration of OCT into indirect laryngoscopes.

Citation Download Citation

Sabine Donner, Sebastian Bleeker, Tammo Ripken, and Alexander Krueger "Automated working distance adjustment for a handheld OCT-Laryngoscope", Proc. SPIE 8926, Photonic Therapeutics and Diagnostics X, 892621 (4 March 2014); https://doi.org/10.1117/12.2035790

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KEYWORDS

Optical coherence tomography

Tissues

Endoscopes

Video

Endoscopy

Natural surfaces

Mirrors

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