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Visual appearance of blood vessels: a phantom study.
Markus Wagner1,2, David Hevisov1,2, Corinna Konrad1,2
1Faculty of Natural Sciences, Ulm University, D-89081 Ulm, Germany.
Biomedical Optics Express
|February 16, 2026
Summary
Veins appear blue due to how light interacts with skin and blood, not just blood
Area of Science:
- Biomedical Optics
- Biophysics
- Optical Engineering
Background:
- The optical basis for the blue appearance of veins remains incompletely understood.
- Previous studies have not provided experimental validation of the optical properties contributing to vein blueness.
Purpose of the Study:
- To experimentally demonstrate the optical mechanisms behind the blue appearance of veins.
- To investigate the role of tissue optics and blood oxygenation in vein coloration.
Main Methods:
- Fabrication of silicone-based skin phantoms with varying vessel depths and diameters.
- Inclusion of blood-mimicking silicone with different oxygenation states within the vessels.
- Quantitative optical evaluation using calibrated photography and hyperspectral imaging.
- Support of experimental findings with Monte Carlo light transport simulations.
Main Results:
- The fabricated phantoms successfully replicated the characteristic blue hue of veins.
- Demonstrated that vein blueness is a result of complex interactions between tissue optics and visual perception.
- Confirmed that blood's intrinsic absorption is not the sole factor determining vein color.
Conclusions:
- The experimental findings support the theory that vein blueness arises from a combination of optical properties and perception.
- This study provides a reproducible experimental model for investigating venous optical phenomena.
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