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

Proceedings Volume 8804, 880403 (2013) https://doi.org/10.1117/12.2031833

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

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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

Proceedings Volume 8801, 88010B (2013) https://doi.org/10.1117/12.2031834

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

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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

Proceedings Volume 8799, 87990N (2013) https://doi.org/10.1117/12.2031835

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

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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

Proceedings Volume 8088, 80881G (2011) https://doi.org/10.1117/12.889768

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

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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

Proceedings Volume 8088, 808808 (2011) https://doi.org/10.1117/12.889438

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

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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

Proceedings Volume 8087, 80871X (2011) https://doi.org/10.1117/12.889329

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

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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

Proceedings Volume 8087, 80871Y (2011) https://doi.org/10.1117/12.889197

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

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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

Proceedings Volume 7368, 736814 (2009) https://doi.org/10.1117/12.831626

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

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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

Proceedings Volume 7368, 736813 (2009) https://doi.org/10.1117/12.831583

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

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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

Proceedings Volume 7368, 736816 (2009) https://doi.org/10.1117/12.831611

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

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SPIE Journal Paper | 1 July 2009 Open Access

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, 044017, (July 2009) https://doi.org/10.1117/12.10.1117/1.3184425

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

Proceedings Volume 6629, 66290P (2007) https://doi.org/10.1117/12.727854

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

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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

Proceedings Volume 6629, 66290U (2007) https://doi.org/10.1117/12.727785

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

Proceedings Volume 6628, 66281H (2007) https://doi.org/10.1117/12.728227

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

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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

Proceedings Volume 5859, 58590F (2005) https://doi.org/10.1117/12.632835

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

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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

Proceedings Volume 5859, 58590L (2005) https://doi.org/10.1117/12.632841

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

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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

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500479

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

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SPIE Journal Paper | 1 July 2002 Open Access

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, (July 2002) https://doi.org/10.1117/12.10.1117/1.1482719

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 Open Access

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, (January 2002) https://doi.org/10.1117/12.10.1117/1.1427048

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

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434501

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

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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

Proceedings Volume 3566, (1998) https://doi.org/10.1117/12.334357

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

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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

Proceedings Volume 3194, (1998) https://doi.org/10.1117/12.301062

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

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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

Proceedings Volume 3194, (1998) https://doi.org/10.1117/12.301055

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

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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

Proceedings Volume 2979, (1997) https://doi.org/10.1117/12.280233

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

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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

Proceedings Volume 2979, (1997) https://doi.org/10.1117/12.280265

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

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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

Proceedings Volume 2979, (1997) https://doi.org/10.1117/12.280259

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

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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

Proceedings Volume 2979, (1997) https://doi.org/10.1117/12.280272

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

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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

Proceedings Volume 2389, (1995) https://doi.org/10.1117/12.209947

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

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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

Proceedings Volume 1881, (1993) https://doi.org/10.1117/12.146312

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

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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

Proceedings Volume 1525, (1991) https://doi.org/10.1117/12.48208

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

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