The value of ultrahigh resolution OCT in dermatology - delineating the dermo-epidermal junction, capillaries in the dermal papillae and vellus hairs

Israelsen, Niels Møller and Maria, Michael and Mogensen, Mette and Bojesen, Sophie and Jensen, Mikkel and Haedersdal, Merete and Podoleanu, Adrian G.H. and Bang, Ole (2018) The value of ultrahigh resolution OCT in dermatology - delineating the dermo-epidermal junction, capillaries in the dermal papillae and vellus hairs. Biomedical Optics Express, 9 (5). p. 2240. ISSN 2156-7085. (doi:https://doi.org/10.1364/BOE.9.002240) (Full text available)

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Abstract

Optical coherence tomography (OCT) imaging of the skin is gaining recognition and is increasingly applied to dermatological research. A key dermatological parameter inferred from an OCT image is the epidermal (Ep) thickness as a thickened Ep can be an indicator of a skin disease. Agreement in the literature on the signal characters of Ep and the subjacent skin layer, the dermis (D), is evident. Ambiguities of the OCT signal interpretation in the literature is however seen for the transition region between the Ep and D, which from histology is known as the dermo-epidermal junction (DEJ); a distinct junction comprised of the lower surface of a single cell layer in epidermis (the stratum basale) connected to an even thinner membrane (the basement membrane). The basement membrane is attached to the underlying dermis. In this work, we investigate the impact of an improved axial and lateral resolution on the applicability of OCT for imaging of the skin. To this goal, OCT images are compared produced by a commercial OCT system (Vivosight from Michaelson Diagnostics) and by an in-house built ultrahigh resolution (UHR-) OCT system for dermatology. In 11 healthy volunteers, we investigate the DEJ signal characteristics. We perform a detailed analysis of the dark (low) signal band clearly seen for UHR-OCT in the DEJ region where we, by using a transition function, find the signal transition of axial sub-resolution character, which can be directly attributed to the exact location of DEJ, both in normal (thin/hairy) and glabrous (thick) skin. To our knowledge no detailed delineating of the DEJ in the UHR-OCT image has previously been reported, despite many publications within this field. For selected healthy volunteers, we investigate the dermal papillae and the vellus hairs and identify distinct features that only UHR-OCT can resolve. Differences are seen in tracing hairs of diameter below 20 μm, and in imaging the dermal papillae where, when utilising the UHR-OCT, capillary structures are identified in the hand palm, not previously reported in OCT studies and specifically for glabrous skin not reported in any other in vivo optical imaging studies.

Item Type: Article
Uncontrolled keywords: Optical coherence tomography; Imaging systems; Dermatology
Subjects: Q Science
Q Science > QC Physics > QC355 Optics
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Adrian Podoleanu
Date Deposited: 22 Jun 2018 14:27 UTC
Last Modified: 22 Jun 2018 14:27 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/67401 (The current URI for this page, for reference purposes)
Podoleanu, Adrian G.H.: https://orcid.org/0000-0002-4899-9656
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