In Vitro Validation of a New Tissue Oximeter Using Visible Light.

There is a clinical need to measure local tissue oxygen saturation (StO), oxy-, deoxy- and total haemoglobin concentration ([OHb], [HHb], [tHb]) in human tissue. The aim was to validate an oximeter called OxyVLS applying visible light spectroscopy (VLS) to determine these parameters without needing to assume a reduced scattering coefficient (μ'). This problem is solved by appropriate calibrations.

In Vitro Comparisons of Near-Infrared Spectroscopy Oximeters: Impact of Slow Changes in Scattering of Liquid Phantoms.

Unlabelled: Several cerebral oximeters based on near-infrared spectroscopy (NIRS) are commercially available that determine tissue oxygen saturation (StO). One problem is an inconsistency of StO readings between different brands of instruments. Liquid blood phantoms mimicking optical properties of the neonatal head enable quantitative device comparisons.

Long-Term Changes in Optical Properties (μ, μ', μ and DPF) of Human Head Tissue During Functional Neuroimaging Experiments.

Frequency-domain near-infrared spectroscopy (FD-NIRS) enables to measure absolute optical properties (i.e. the absorption coefficient, μ, and the reduced scattering coefficient, [Formula: see text]) of the brain tissue.

Absolute Values of Optical Properties (μ, μ΄, μ and DPF) of Human Head Tissue: Dependence on Head Region and Individual.

Background: Absolute optical properties (i.e., the absorption coefficient, μ, and the reduced scattering coefficient, [Formula: see text]) of head tissue can be measured with frequency-domain near-infrared spectroscopy (FD-NIRS).

Impact of Changes in Systemic Physiology on fNIRS/NIRS Signals: Analysis Based on Oblique Subspace Projections Decomposition.

Measurements of cerebral and muscle oxygenation (StO) and perfusion ([tHb]) with functional near-infrared spectroscopy (fNIRS) and near infrared spectroscopy (NIRS), respectively, can be influenced by changes in systemic physiology. The aim of our study was to apply the oblique subspace projections signal decomposition (OSPSD) to find the contribution from systemic physiology, i.e.

In vivo precision assessment of a near-infrared spectroscopy-based tissue oximeter (OxyPrem v1.3) in neonates considering systemic hemodynamic fluctuations.

The aim was to determine the precision of a noninvasive near-infrared spectroscopy (NIRS)-based tissue oximeter (OxyPrem v1.3). Using a linear mixed-effects model, we quantified the variability for cerebral tissue oxygenation (StO2) measurements in 35 preterm neonates to be 2.

Tissue oximetry by diffusive reflective visible light spectroscopy: Comparison of algorithms and their robustness.

It is essential to measure tissue oxygen saturation (StO ) locally and in thin layers of tissue, for example, the bronchial mucosa, skin flaps and small bones. Visible light spectroscopy (VLS) with a shallow penetration depth is suitable method. Although several VLS algorithms have been developed and described, they have not yet been compared to each other.

Quantifying the effect of adipose tissue in muscle oximetry by near infrared spectroscopy.

Change of muscle tissue oxygen saturation (), due to exercise, measured by near infrared spectroscopy (NIRS) is known to be lower for subjects with higher adipose tissue thickness. This is most likely not physiological but caused by the superficial fat and adipose tissue. In this paper we assessed, in vitro, the influence of adipose tissue thickness on muscle , measured by NIRS oximeters.

Local Measurement of Flap Oxygen Saturation: An Application of Visible Light Spectroscopy.

The aim was to develop and test a new device (OxyVLS) to measure tissue oxygen saturation by visible light spectroscopy independently of the optical pathlength and scattering. Its local applicability provides the possibility of real time application in flap reconstruction surgery. We tested OxyVLS in a liquid phantom with optical properties similar to human tissue.

Evaluation of a textile-based near infrared spectroscopy system in calf muscle oxygenation measurements.

We recently introduced a novel textile-based NIRS sensor (TexNIRS). Here, we evaluate TexNIRS in ten subjects (16 legs, age 28.5 ± 2.

Textile integrated sensors and actuators for near-infrared spectroscopy.

Being the closest layer to our body, textiles provide an ideal platform for integrating sensors and actuators to monitor physiological signals. We used a woven textile to integrate photodiodes and light emitting diodes. LEDs and photodiodes enable near-infrared spectroscopy (NIRS) systems to monitor arterial oxygen saturation and oxygenated and deoxygenated hemoglobin in human tissue.