Optical Properties of Biological Tissues
Summary
Biological tissues exhibit complex interactions with light arising from the absorption and scattering by their constituent molecules and microstructures. Absorption is determined primarily by chromophores such as haemoglobin, water and lipids, each with characteristic spectral signatures across ultraviolet, visible and near-infrared wavelengths. Scattering originates from refractive-index mismatches at cellular and subcellular scales, leading to forward-biased diffusion of photons. The combined effect of absorption and scattering governs photon penetration depth, spatial resolution and the contrast achievable in optical diagnostic and therapeutic modalities. Quantitative characterisation of tissue optical properties underpins techniques ranging from diffuse optical spectroscopy and tomography to optical coherence tomography and photoacoustic imaging. Advances in modelling light transport, including Monte Carlo simulations and analytical diffusion theories, have refined our understanding of photon migration in layered, turbid media. Calibration with tissue-mimicking phantoms ensures accurate extraction of absorption and scattering coefficients, while non-contact imaging methods enable wide-field mapping of chromophore distributions. Collectively, these insights facilitate non-invasive monitoring of physiological parameters, guide photodynamic therapies and support the development of portable, point-of-care optical devices.
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Optical Properties of Biological Tissues publication trend
The graph below shows the total number of articles in optical properties of biological tissues across all publications each year (not limited to Nature Index journals).
Technical terms
Absorption coefficient (μa): A measure of the probability per unit path length that a photon is absorbed by tissue chromophores.
Scattering coefficient (μs): A measure of the probability per unit path length that a photon is elastically scattered by microstructures.
Reduced scattering coefficient (μ′s): The scattering coefficient weighted by (1−g), where g is the anisotropy factor, representing the net deflection per scattering event.
Anisotropy factor (g): The average cosine of scattering angles, indicating the preferential forward or backward direction of scattered photons.
Monte Carlo simulation: A stochastic computational method for modelling photon transport through turbid media by tracking individual photon trajectories and interactions.
Diffuse reflectance spectroscopy (DRS): A non-invasive technique that measures remitted light from tissues to infer their absorption and scattering properties.
References
- Extended-wavelength diffuse reflectance spectroscopy dataset of animal tissues for bone-related biomedical applications. Scientific Data (2024).
- Turbid Optical Phantoms Using Microspheres: A Comprehensive Guide to Mixing Protocols and Optical Property Computation. IEEE Transactions on Instrumentation and Measurement (2025).
- Depth Penetration of Light into Skin as a Function of Wavelength from 200 to 1000 nm. Photochemistry and Photobiology (2021).
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