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Updated: Feb 8, 2026

Dual Raster-Scanning Photoacoustic Small-Animal Imager for Vascular Visualization
Published on: July 15, 2020
Assessing nailfold microvascular structure with ultra-wideband raster-scan optoacoustic mesoscopy
J Aguirre1, B Hindelang2, Andrei Berezhnoi1
1Chair of Biological Imaging, Technische Universität München and Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany.
Abstract:
Nailfold capillaroscopy, based on bright-field microscopy, is widely used to diagnose systemic sclerosis (SSc). However it cannot reveal information about venules and arterioles lying deep under the nailfold, nor can it provide detailed data about surface microvasculature when the skin around the nail is thick. These limitations reflect the fact that capillaroscopy is based on microscopy methods whose penetration depth is restricted to about 200 μm. We investigated whether ultra-wideband raster-scan optoacoustic mesoscopy (UWB-RSOM) can resolve small capillaries of the nailfold in healthy volunteers and compared the optoacoustic data to conventional capillaroscopy examinations. We quantified UWB-RSOM-resolved capillary density and capillary diameter as features that relate to SSc biomarkers, and we obtained the first three-dimensional, in vivo images of the deeper arterioles and venules. These results establish the potential of UWB-RSOM for analyzing SSc-relevant markers.
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