Dr. Matthias Kohl-Bareis Profile

Dr. Matthias Kohl-Bareis

Doctor at RheinAhrCampus Remagen

SPIE Involvement:

Author

Publications (30)

Proceedings Article | 24 June 2013 Paper

Simultaneous imaging of cortical haemoglobin concentration and blood flow with RGB reflectometry and LASCA during cortical activation in rats

A. Steimers, S. Pinkernell, U. Lindauer, M. Kohl-Bareis

Proc. SPIE. 8804, Neurophotonics

KEYWORDS: Light sources, Imaging systems, Speckle, Cameras, Sensors, Blood, Reflectometry, Blood circulation, RGB color model, Cortical activation

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Proceedings Article | 18 June 2013 Paper

Efficient algorithm for the temporal and spatial based calculation of speckle contrast

A. Steimers, W. Farnung, M. Kohl-Bareis

Proc. SPIE. 8801, Novel Biophotonic Techniques and Applications II

KEYWORDS: Signal to noise ratio, Speckle, Light scattering, Laser scattering, Image resolution, Speckle analysis, Temporal resolution, Speckle pattern, Blood circulation, Spatial resolution

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Proceedings Article | 14 June 2013 Paper

Wavelength selection for the improvement of the signal to noise ratio for imaging of haemoglobin oxygenation with RGB reflectometry

A. Steimers, S. Steinke, M. Kohl-Bareis

Proc. SPIE. 8799, Diffuse Optical Imaging IV

KEYWORDS: Signal to noise ratio, Light sources, Light emitting diodes, Tissues, Imaging systems, Sensors, Reflectometry, Charge-coupled devices, Condition numbers, RGB color model

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Proceedings Article | 15 June 2011 Paper

Simultaneous imaging of haemoglobin oxygenation and blood flow with RGB reflectometry and LASCA during stroke in rats

A. Steimers, M. Gramer, M. Takagaki, R. Graf, M. Kohl-Bareis

Proc. SPIE. 8088, Diffuse Optical Imaging III

KEYWORDS: Light sources, Imaging systems, Speckle, Cameras, Sensors, Skin, Arteries, Reflectometry, Blood circulation, RGB color model

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Proceedings Article | 15 June 2011 Paper

Oxygenation of the calf muscle during an incremental, intermittent walking exercise assessed by NIRS

S. Härtel, C. Kutzner, D. Schneider, S. Grieger, M. Neumaier, M. Kohl-Bareis

Proc. SPIE. 8088, Diffuse Optical Imaging III

KEYWORDS: Statistical analysis, Tissues, Blood, Heart, Oxygen, Blood circulation, Near infrared spectroscopy, Tissue optics, Spirometry, Absorption

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Proceedings Article | 10 June 2011 Paper

Evaluation of haemoglobin changes of skin and muscle tissue of the calf induced by topical application of a nonivamide / nicoboxil cream

Jan Warnecke, Thomas Wendt, Matthias Schak, Thorsten Schiffer, Wilhelm Bloch, Matthias Kohl-Bareis

Proc. SPIE. 8087, Clinical and Biomedical Spectroscopy and Imaging II

KEYWORDS: Injuries, Tissues, Sensors, Signal attenuation, Skin, Oxygen, Blood circulation, Hemodynamics, Near infrared spectroscopy, Tissue optics

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Proceedings Article | 10 June 2011 Paper

Design of a tissue oxygenation monitor and verification on human skin

Hongyuan Liu, Matthias Kohl-Bareis, Xiabing Huang

Proc. SPIE. 8087, Clinical and Biomedical Spectroscopy and Imaging II

KEYWORDS: Doppler effect, Tissues, Signal attenuation, Blood, Skin, Oxygen, Blood circulation, Tissue optics, Laser tissue interaction, Absorption

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Proceedings Article | 8 July 2009 Paper

Imaging of cortical haemoglobin concentration with RGB reflectometry

A. Steimers, M. Gramer, B. Ebert, M. Füchtemeier, G. Royl, C. Leithner, J. Dreier, U. Lindauer, M. Kohl-Bareis

Proc. SPIE. 7368, Clinical and Biomedical Spectroscopy

KEYWORDS: Light sources, Cameras, Sensors, Spectroscopy, CCD cameras, Reflectometry, Tissue optics, Condition numbers, RGB color model, Cortical activation

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Proceedings Article | 8 July 2009 Paper

Using broadband spatially resolved NIRS to assess muscle oxygenation during altered running protocols

Georg Koukourakis, Maria Vafiadou, André Steimers, Dmitri Geraskin, Patrick Neary, Matthias Kohl-Bareis

Proc. SPIE. 7368, Clinical and Biomedical Spectroscopy

KEYWORDS: Biomedical optics, Modulation, Imaging systems, Spectroscopy, Heart, Oxygen, Near infrared spectroscopy, Tissue optics, Mechanical efficiency, Spirometry

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Proceedings Article | 8 July 2009 Paper

Tissue oxygenation during exercise measured with NIRS: a quality control study

Erwin Gerz, Dmitri Geraskin, Patrick Neary, Julia Franke, Petra Platen, Matthias Kohl-Bareis

Proc. SPIE. 7368, Clinical and Biomedical Spectroscopy

KEYWORDS: Optical fibers, Biomedical optics, Tissues, Signal attenuation, Spectroscopy, Oxygen, Near infrared spectroscopy, Applied sciences, Cardiology, Spectroscopes

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SPIE Journal Paper | 1 July 2009

Optical measurement of adipose tissue thickness and comparison with ultrasound, magnetic resonance imging, and callipers

Dmitri Geraskin, Heide Boeth, Matthias Kohl-Bareis

JBO Vol. 14 Issue 04

KEYWORDS: Tissue optics, Absorption, Tissues, Ultrasonography, Signal attenuation, Optical testing, Scattering, Near infrared spectroscopy, Spectroscopy, Skin

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Proceedings Article | 12 July 2007 Paper

Algorithms for muscle oxygenation monitoring corrected for adipose tissue thickness

Dmitri Geraskin, Petra Platen, Julia Franke, Matthias Kohl-Bareis

Proc. SPIE. 6629, Diffuse Optical Imaging of Tissue

KEYWORDS: Tissues, Scattering, Signal attenuation, Ultrasonography, Spectroscopy, Oxygen, Monte Carlo methods, Near infrared spectroscopy, Tissue optics, Absorption

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Proceedings Article | 12 July 2007 Paper

Cerebral oxygenation monitoring during cardiac bypass surgery in infants with broad band spatially resolved spectroscopy

Jan Soschinski, Lofti Ben Mine, Dmitri Geraskin, Gerardus Bennink, Matthias Kohl-Bareis

Proc. SPIE. 6629, Diffuse Optical Imaging of Tissue

KEYWORDS: Optical fibers, Surgery, Imaging systems, Sensors, Signal attenuation, Spectroscopy, Spectrometers, Oxygen, Charge-coupled devices, Absorption

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Proceedings Article | 11 July 2007 Paper

Spectroscopic measurement of adipose tissue thickness and comparison with ultrasound imaging

Dmitri Geraskin, Heide Boeth, Matthias Kohl-Bareis

Proc. SPIE. 6628, Diagnostic Optical Spectroscopy in Biomedicine IV

KEYWORDS: Tissues, Signal attenuation, Ultrasonography, Spectroscopy, Error analysis, Imaging spectroscopy, Optical testing, Near infrared spectroscopy, Tissue optics, Absorption

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Proceedings Article | 8 October 2005 Paper

Muscle oxygenation during exercise under hypoxic conditions assessed by spatially resolved broad-band NIR spectroscopy

Dmitri Geraskin, Petra Platen, Julia Franke, Christiane Andre, Wilhelm Bloch, Matthias Kohl-Bareis

Proc. SPIE. 5859, Photon Migration and Diffuse-Light Imaging II

KEYWORDS: Near infrared, Tissues, Sensors, Signal attenuation, Blood, Spectroscopy, Skin, Oxygen, Near infrared spectroscopy, Tissue optics

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Proceedings Article | 8 October 2005 Paper

System for the measurement of blood flow and oxygenation in tissue applied to neurovascular coupling in brain

Matthias Kohl-Bareis, Christoph Leithner, Heike Sellien, Roland Guertler, Dmitri Geraskin, Benjamin Rohrer, Georg Royl, Ulrich Dirnagl, Ute Lindauer

Proc. SPIE. 5859, Photon Migration and Diffuse-Light Imaging II

KEYWORDS: Tissues, Scattering, Sensors, Signal attenuation, Spectroscopy, Oxygen, Blood circulation, Tissue optics, Absorption, Brain

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Proceedings Article | 15 October 2003 Paper

Functional brain imaging by CW-NIRS coregistered by blood flow monitors

Jens Steinbrink, Florian Kempf, Stephan Schreiber, Kamil Uludag, Matthias Kohl, Jose Valdueza, Arno Villringer, Hellmuth Obrig

Proc. SPIE. 5138, Photon Migration and Diffuse-Light Imaging

KEYWORDS: Doppler effect, Visualization, Tissues, Blood, Blood circulation, Near infrared spectroscopy, Blood pressure, Absorption, Brain imaging, Brain

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SPIE Journal Paper | 1 July 2002

Noninvasive monitoring of cerebral blood flow by a dye bolus method: separation of brain from skin and skull signals

Matthias Kohl-Bareis, Hellmuth Obrig, Jens Steinbrink, Jasmin Malak, Kamil Uludag, Arno Villringer

JBO Vol. 7 Issue 03

KEYWORDS: Absorption, Signal attenuation, Tissue optics, Skin, Skull, Near infrared spectroscopy, Sensors, Tissues, Magnetic resonance imaging, Cerebral blood flow

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SPIE Journal Paper | 1 January 2002

Crosstalk in the Lambert-Beer calculation for near-infrared wavelengths estimated by Monte simulations

Kamil Uludag, Matthias Kohl-Bareis, Jens Steinbrink, Hellmuth Obrig, Arno Villringer

JBO Vol. 7 Issue 01

KEYWORDS: Chromophores, Absorption, Tissues, Signal attenuation, Head, Optical spheres, Photons, Brain, Scattering, Monte Carlo methods

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Proceedings Article | 29 June 2001 Paper

Noninvasive cerebral blood flow monitoring by a dye bolus method:separation of extra- and intracerebral absorption changes by frequency-domain spectroscopy

Matthias Kohl-Bareis, Hellmuth Obrig, Jens Steinbrink, Jasmin Malak, Kamil Uludag, Arno Villringer

Proc. SPIE. 4250, Optical Tomography and Spectroscopy of Tissue IV

KEYWORDS: Tissues, Signal attenuation, Magnetic resonance imaging, Spectroscopy, Skin, Near infrared spectroscopy, Skull, Tissue optics, Signal detection, Absorption

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Proceedings Article | 30 December 1998 Paper

Multivariate spectral analysis of the beat-to-beat sampled cortical NIRS signals and the heart-rate variability

J. Scholz, Matthias Kohl-Bareis, Christian Nolte, Carsten Hennig, Arno Villringer

Proc. SPIE. 3566, Photon Propagation in Tissues IV

KEYWORDS: Signal to noise ratio, Statistical analysis, Visualization, Digital filtering, Heart, Near infrared spectroscopy, Picosecond phenomena, Chlorine, Cortical activation, Brain

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Proceedings Article | 1 January 1998 Paper

Changes in cytochrome-oxidase oxidation in the occipital cortex during visual simulation: improvement in sensitivity by the determination of the wavelength dependence of the differential pathlength

Matthias Kohl-Bareis, Christian Nolte, Hauke Heekeren, Susanne Horst, J. Scholz, Hellmuth Obrig, Arno Villringer

Proc. SPIE. 3194, Photon Propagation in Tissues III

KEYWORDS: Human subjects, Visualization, Signal attenuation, Blood, Head, Near infrared spectroscopy, Mass attenuation coefficient, Absorption, Oxidation

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Proceedings Article | 1 January 1998 Paper

Determination of optical properties by variation of boundary conditions

Stephan Nickell, Matthias Essenpreis, U. Kraemer, Matthias Kohl-Bareis, Dirk Boecker

Proc. SPIE. 3194, Photon Propagation in Tissues III

KEYWORDS: Diffuse reflectance spectroscopy, Optical properties, Scattering, Sensors, Photons, Diffusion, Reflectivity, Multiple scattering, Head, Tissue optics

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Proceedings Article | 18 August 1997 Paper

Toward noninvasive optical human brain mapping: improvements of the spectral, temporal, and spatial resolution of near-infrared spectroscopy

Hauke Heekeren, Rudiger Wenzel, Hellmuth Obrig, Jan Ruben, J.-P. Ndayisaba, Qingming Luo, A. Dale, Shoko Nioka, Matthias Kohl-Bareis, Ulrich Dirnagl, Arno Villringer, Britton Chance

Proc. SPIE. 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II

KEYWORDS: Visualization, Imaging systems, Blood, CCD cameras, Temporal resolution, Spectral resolution, Near infrared spectroscopy, Spatial resolution, Volume visualization, Brain mapping

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Proceedings Article | 18 August 1997 Paper

Monitoring of cerebral hemodynamics during open-heart surgery in children using near-infrared intensity-modulated spectroscopy

Matthias Kohl-Bareis, Russell Watson, Gabriel Chow, Idris Roberts, David Delpy, Mark Cope

Proc. SPIE. 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II

KEYWORDS: Modulation, Tissues, Surgery, Scattering, Signal attenuation, Spectroscopy, Oxygen, Chromophores, Tissue optics, Absorption

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Proceedings Article | 18 August 1997 Paper

Near-infrared optical properties of ex-vivo human skin and subcutaneous tissues using reflectance and transmittance measurements

Rebecca Simpson, Jan Laufer, Matthias Kohl-Bareis, Matthias Essenpreis, Mark Cope

Proc. SPIE. 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II

KEYWORDS: Optical properties, Tissues, Scattering, Skin, Light scattering, Reflectivity, Monte Carlo methods, Transmittance, Integrating spheres, Absorption

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Proceedings Article | 18 August 1997 Paper

Optical properties of highly scattering media determined from the ratio of changes in attenuation, phase, and modulation depth

Matthias Kohl-Bareis, Russell Watson, Mark Cope

Proc. SPIE. 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II

KEYWORDS: Modulation, Optical properties, Tissues, Scattering, Sensors, Signal attenuation, Light scattering, Phase shift keying, Tissue optics, Absorption

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Proceedings Article | 30 May 1995 Paper

Glucose-induced changes in scattering and light transport in tissue-simulating phantoms

Matthias Kohl-Bareis, Matthias Essenpreis, Dirk Boecker, Mark Cope

Proc. SPIE. 2389, Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation

KEYWORDS: Refractive index, Glucose, Modulation, Tissues, Scattering, Signal attenuation, Diffusion, Light scattering, Tissue optics, Absorption

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Proceedings Article | 18 June 1993 Paper

Imaging of superficially growing tumors by delayed observation of laser-induced fluorescence

M. Kohl, Uwe Sukowski, Bernd Ebert, Joerg Neukammer, Herbert Rinneberg, Christian Nowak

Proc. SPIE. 1881, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy II

KEYWORDS: Tumor growth modeling, Tumors, Tissues, Luminescence, Laser induced fluorescence, In vivo imaging, Tissue optics, Natural surfaces, Laser tissue interaction, Absorption

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Proceedings Article | 1 November 1991 Paper

Imaging of tumors by time-delayed laser-induced fluorescence

M. Kohl, Joerg Neukammer, Uwe Sukowski, Herbert Rinneberg, Hanns-joerg Sinn, E. Friedrich, Georgi Graschew, Peter Schlag, Dieter Woehrle

Proc. SPIE. 1525, Future Trends in Biomedical Applications of Lasers

KEYWORDS: Biomedical optics, Tumors, Tissues, Luminescence, Laser scattering, Laser induced fluorescence, Tissue optics, Pulsed laser operation, Natural surfaces, Laser tissue interaction

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