Mr. Johannes Bauer-Marschallinger Profile

Johannes Bauer-Marschallinger

Research Scientist at Research Ctr for Non-Destructive Testing GmbH

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Publications (15)

Proceedings Article | 3 March 2020 Paper

Breaking the resolution limit in photoacoustic imaging using positivity and sparsity

Peter Burgholzer, Johannes Bauer-Marschallinger, Mike Hettich, Markus Haltmeier

Proceedings Volume 11240, 112403Y (2020) https://doi.org/10.1117/12.2543515

KEYWORDS: Signal attenuation, Acoustics, Tissues, Spatial resolution, Photoacoustic imaging, Image resolution, Transducers, Tissue optics, Semiconducting wafers, Thermodynamics

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Proceedings Article | 27 February 2019 Paper

NETT regularization for compressed sensing photoacoustic tomography

Stephan Antholzer, Johannes Schwab, Johnnes Bauer-Marschallinger, Peter Burgholzer, Markus Haltmeier

Proceedings Volume 10878, 108783B (2019) https://doi.org/10.1117/12.2508486

KEYWORDS: Compressed sensing, Convolution, Photoacoustic tomography, Sensors, Reconstruction algorithms, Inverse problems, Neural networks, Image restoration, Network architectures

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Proceedings Article | 19 February 2018 Paper

Ring detector arrays for large depth of field scanning photoacoustic macroscopy

Guenther Paltauf, Paul Torke, Robert Nuster, Johannes Bauer-Marschallinger, Thomas Berer, Gerhard Haudum, Peter Burgholzer

Proceedings Volume 10494, 104943Q (2018) https://doi.org/10.1117/12.2292051

KEYWORDS: Sensors, Ferroelectric polymers, Monte Carlo methods, Photoacoustic spectroscopy, Scattering, Detector arrays, Optical components, Photoacoustic imaging

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Proceedings Article | 19 February 2018 Paper

Photoacoustic projection imaging using an all-optical detector array

J. Bauer-Marschallinger, K. Felbermayer, T. Berer

Proceedings Volume 10494, 104944C (2018) https://doi.org/10.1117/12.2289810

KEYWORDS: Optical fibers, Photoacoustic spectroscopy, Sensors, Detector arrays, Photoacoustic imaging, Fiber optics, Phase shifts, Prototyping, 3D image processing, Photodetectors

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Proceedings Article | 19 February 2018 Paper

Photoacoustic scanning macroscopy with interferometric ultrasound detection based on a fiber optic ring array

J. Bauer-Marschallinger, A. Höllinger, P. Torke, G. Paltauf, G. Haudum, B. Jakoby, P. Burgholzer, T. Berer

Proceedings Volume 10494, 104945V (2018) https://doi.org/10.1117/12.2289639

KEYWORDS: Photoacoustic spectroscopy, Fiber optics, Transducers, Sensors, Acoustics, Optical fibers, Ultrasonics, Image resolution, Phase shifts, Ultrasonography

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Proceedings Article | 15 February 2017 Presentation + Paper

Multimodal non-contact photoacoustic imaging and optical coherence tomography using all optical detection

Elisabeth Leiss-Holzinger, Johannes Bauer-Marschallinger, Thomas Berer

Proceedings Volume 10057, 100570I (2017) https://doi.org/10.1117/12.2250863

KEYWORDS: Optical coherence tomography, Photoacoustic imaging, Fiber optics, Multimodal imaging, Remote sensing, Interferometry, Signal to noise ratio, Photodetectors, Sensors, Interferometers, Ultrasonics

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SPIE Journal Paper | 28 April 2015 Open Access

Multimodal noncontact photoacoustic and optical coherence tomography imaging using wavelength-division multiplexing

Thomas Berer, Elisabeth Leiss-Holzinger, Armin Hochreiner, Johannes Bauer-Marschallinger, Andreas Buchsbaum

JBO, Vol. 20, Issue 04, 046013, (April 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.4.046013

KEYWORDS: Optical coherence tomography, Coherence imaging, Photoacoustic spectroscopy, Coarse wavelength division multiplexing, Fiber optics, Data acquisition, Skin, Optical imaging, Fiber optic networks, Sensors

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Proceedings Article | 11 March 2015 Paper

Photoacoustic projection imaging using a 64-channel fiber optic detector array

Johannes Bauer-Marschallinger, Karoline Felbermayer, Klaus-Dieter Bouchal, Istvan Veres, Hubert Grün, Peter Burgholzer, Thomas Berer

Proceedings Volume 9323, 93233U (2015) https://doi.org/10.1117/12.2077206

KEYWORDS: Sensors, Photoacoustic spectroscopy, Detector arrays, Interferometers, Fiber optics, Photoacoustic imaging, 3D image processing, Ultrasonics, Polymer optical fibers, Phase shifts

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Proceedings Article | 11 March 2015 Paper

Multimodal non-contact photoacoustic and OCT imaging with galvanometer scanning

Thomas Berer, Armin Hochreiner, Elisabeth Leiss-Holzinger, Johannes Bauer-Marschallinger, Andreas Buchsbaum

Proceedings Volume 9323, 93233T (2015) https://doi.org/10.1117/12.2077202

KEYWORDS: Optical coherence tomography, Photoacoustic spectroscopy, Photoacoustic imaging, Fiber optics, Fiber optic networks, Interferometry, Light sources, Interferometers, Coherence imaging, Scanners

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Proceedings Article | 3 March 2014 Paper

Fiber-based remote photoacoustic imaging utilizing a Mach Zehnder interferometer with optical amplification

A. Hochreiner, J. Bauer-Marschallinger, P. Burgholzer, T. Berer

Proceedings Volume 8943, 89436B (2014) https://doi.org/10.1117/12.2039019

KEYWORDS: Photoacoustic imaging, Optical amplifiers, Sensors, Signal detection, Skin, Ultrasonography, Tissues, Tissue optics, Photoacoustic spectroscopy, Transducers

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Proceedings Article | 3 March 2014 Paper

Multimodal non-contact photoacoustic and OCT imaging using a fiber based approach

T. Berer, E. Leiss-Holzinger, A. Hochreiner, J. Bauer-Marschallinger, M. Leitner, A. Buchsbaum

Proceedings Volume 8943, 894345 (2014) https://doi.org/10.1117/12.2038962

KEYWORDS: Optical coherence tomography, Photoacoustic spectroscopy, Photoacoustic imaging, Ultrasonics, Head, Imaging systems, Sensors, Data acquisition, Fiber optic networks, Fiber optics

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Proceedings Article | 4 March 2013 Paper

Low-cost parallelization of optical fiber based detectors for photoacoustic imaging

Johannes Bauer-Marschallinger, Karoline Felbermayer, Armin Hochreiner, Hubert Grün, Günther Paltauf, Peter Burgholzer, Thomas Berer

Proceedings Volume 8581, 85812M (2013) https://doi.org/10.1117/12.2002034

KEYWORDS: Sensors, Optical fibers, Photodetectors, Phase shifts, Photoacoustic imaging, Photoacoustic spectroscopy, Ultrasonics, Signal detection, Mach-Zehnder interferometers, Analog electronics

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Proceedings Article | 23 February 2011 Paper

Ultrasonic attenuation of biomaterials for compensation in photoacoustic imaging

Johannes Bauer-Marschallinger, Thomas Berer, Heinz Roitner, Hubert Grün, Bernhard Reitinger, Peter Burgholzer

Proceedings Volume 7899, 789931 (2011) https://doi.org/10.1117/12.874663

KEYWORDS: Signal attenuation, Tissues, Ultrasonography, Acoustics, Ultrasonics, Transducers, Photoacoustic imaging, Liquids, Blood, Signal detection

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Proceedings Article | 24 February 2010 Paper

Image reconstruction in photoacoustic tomography using integrating detectors accounting for frequency-dependent attenuation

P. Burgholzer, H. Roitner, J. Bauer-Marschallinger, G. Paltauf

Proceedings Volume 7564, 75640O (2010) https://doi.org/10.1117/12.843220

KEYWORDS: Signal attenuation, Sensors, Acoustics, Photoacoustic tomography, Absorption, Tissues, Photoacoustic spectroscopy, 3D image processing, Image restoration, Diffuse optical imaging

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Photoacoustic Imaging (also known as thermoacoustic or optoacoustic imaging) is a novel imaging method which combines the advantages of Diffuse Optical Imaging (high contrast) and Ultrasonic Imaging (high spatial resolution). A short laser pulse excites the sample. The absorbed energy causes a thermoelastic expansion and thereby launches a broadband ultrasonic wave (photoacoustic signal). This way one can measure the optical contrast of a sample with ultrasonic resolution. For collecting photoacoustic signals our group introduced so called integrating detectors a few years ago. Such integrating detectors integrate the pressure in one or two dimensions -a line or a plane detector, respectively. Thereby the three dimensional imaging problem is reduced to a two or a one dimensional problem for the projections and a two or three dimensional inverse radon transform as a second step to get the three dimensional initial pressure distribution. The integrating detectors are mainly optical detectors and thus can provide a high bandwidth up to several 100 MHz. Using these detectors the resolution is often limited by the acoustic attenuation in the sample itself, because attenuation increases with higher frequencies. Stoke's equation describes the attenuation of photoacoustic generated waves in liquids very well, which results in an increase of the acoustic attenuation with the square of the frequency. For fat tissue an absorption coefficient which is approximately linear proportional to frequency is reported. Presented measurements give an exponential power law dependency with an exponent between 1.31 and 1.36 in fat tissue near the skin of a pig. These equations describing frequency dependent acoustic attenuation have been solved in the past by decomposing the pressure wave into plane waves damped in space, described by the complex part of the wave number equal to the attenuation coefficient. One main result of this paper is that for Photoacoustic Tomography another description seems to be very useful: like for a standing wave in a resonator the wave number is real but the frequency is complex. The complex part of the frequency is the damping in time. Both descriptions are equivalent, but with the complex frequency description acoustic attenuation can be included in all "k-space" methods well known in Photoacoustic Tomography just by introducing a factor describing the exponential decay in time.

Proceedings Article | 10 July 2009 Paper

Experimental determination of frequency dependent acoustic attenuation for photoacoustic imaging

Johannes Bauer-Marschallinger, Francisco Camacho-Gonzales, Thomas Berer, Hubert Grün, Peter Burgholzer

Proceedings Volume 7371, 73711P (2009) https://doi.org/10.1117/12.831763

KEYWORDS: Acoustics, Signal attenuation, Absorption, Silicon, Semiconducting wafers, Sensors, Pulsed laser operation, Diodes, Spherical lenses, Semiconductor lasers

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