6 March 2006 Imaging of venous valves with photoacoustics
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Abstract
We report results of a feasibility study regarding the question whether or not venous valves can be imaged using photoacoustics, and how they will appear in the images. First an in vitro study was made on tissue phantoms consisting of blood filled rubber tubes with discontinuities in the inner tube wall. We also have studied superficial veins on the ventral side of the wrist. For excitation, an Nd:YAG laser at 1064 nm was used. Detection of acoustic signals was performed with a PVdF sensor consisting of two concentric rings. Measurements were performed on valves which where first localized by palpation. The phantom studies showed that irregular structures of the tube walls could clearly be identified from the photoacoustic images. Furthermore, in a photoacoustic image of a vein at the dorsal side of the wrist, the presence of a valve could be identified from a region of increased signal intensity within the vessel lumen.
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Nienke Bosschaart, Roy Kolkman, Ton van Leeuwen, Wiendelt Steenbergen, "Imaging of venous valves with photoacoustics", Proc. SPIE 6086, Photons Plus Ultrasound: Imaging and Sensing 2006: The Seventh Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 60860O (6 March 2006); doi: 10.1117/12.647431; https://doi.org/10.1117/12.647431
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KEYWORDS
Photoacoustic spectroscopy

Blood

Veins

Acoustics

Sensors

Tissues

Absorption

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