Mr. Hubert Grün Profile

Hubert Grün

Head of Strategic Research at RECENDT GmbH

SPIE Involvement:

Author

Area of Expertise:

novel optical non-destructive methods , fiber-based detectors , photoacoustic imaging for medical applications , laser ultrasound , optical coherence tomography , terahertz imaging and spectroscopy

Websites:

Company Website

Publications (24)

Proceedings Article | 11 March 2015 Paper

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

Read Abstract +

SPIE Journal Paper | 22 May 2014 Open Access

Open Access

Deblurring algorithms accounting for the finite detector size in photoacoustic tomography

Heinz Roitner, Markus Haltmeier, Robert Nuster, Dianne O’Leary, Thomas Berer, Guenther Paltauf, Hubert Grün, Peter Burgholzer

JBO, Vol. 19, Issue 05, 056011, (May 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.5.056011

KEYWORDS: Sensors, Reconstruction algorithms, Detection and tracking algorithms, Deconvolution, Signal detection, Photoacoustic tomography, Acoustics, Computer simulations, Photoacoustic spectroscopy, Image restoration

Read Abstract +

Proceedings Article | 21 May 2014 Paper

Paper

Center crack detection during continuous casting of aluminum by laser ultrasonic measurements

Hubert Grün, Thomas Mitter, Jürgen Roither, Andreas Betz, Salar Bozorgi, Peter Burgholzer

Proceedings Volume 9105, 91050A (2014) https://doi.org/10.1117/12.2048897

KEYWORDS: Ultrasonics, Signal detection, Aluminum, Solids, Ultrasonography, Reflection, Wave propagation, Pulsed laser operation, Acoustics, Nondestructive evaluation

Read Abstract +

Proceedings Article | 3 March 2014 Paper

Paper

Spatial over-sampling and its influence on spatial resolution for photoacoustic tomography with finite sized detectors

P. Burgholzer, H. Roitner, T. Berer, H. Grün, R. Nuster, G. Paltauf, M. Haltmeier

Proceedings Volume 8943, 89432K (2014) https://doi.org/10.1117/12.2039591

KEYWORDS: Sensors, Reconstruction algorithms, Deconvolution, Signal detection, Detection and tracking algorithms, Photoacoustic tomography, Acoustics, Spatial resolution, Detector arrays, Convolution

Read Abstract +

Proceedings Article | 4 March 2013 Paper

Paper

Deconvolution algorithms for photoacoustic tomography to reduce blurring caused by finite sized detectors

Peter Burgholzer, Heinz Roitner, Thomas Berer, Hubert Grün, D. O'Leary, R. Nuster, G. Paltauf, M. Haltmeier

Proceedings Volume 8581, 858137 (2013) https://doi.org/10.1117/12.2003889

KEYWORDS: Sensors, Signal detection, Detection and tracking algorithms, Reconstruction algorithms, Deconvolution, Photoacoustic tomography, Acoustics, Spherical lenses, Wave propagation, Detector arrays

Read Abstract +

Proceedings Article | 4 March 2013 Paper

Paper

Remote photoacoustic imaging on non-flat surfaces and appropriate reconstruction algorithms

T. Berer, A. Hochreiner, H. Roitner, H. Grün, P. Burgholzer

Proceedings Volume 8581, 858134 (2013) https://doi.org/10.1117/12.2003566

KEYWORDS: Reconstruction algorithms, Ultrasonics, Photoacoustic imaging, Photoacoustic spectroscopy, Optical coherence tomography, Computer simulations, Two wave mixing, Interferometers, Modulation, Interferometry

Read Abstract +

Proceedings Article | 4 March 2013 Paper

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

Read Abstract +

Proceedings Article | 23 February 2012 Paper

Paper

Contactless photoacoustic imaging of biological samples

Thomas Berer, Armin Hochreiner, Hubert Grün, Peter Burgholzer

Proceedings Volume 8223, 82231G (2012) https://doi.org/10.1117/12.908483

KEYWORDS: Photoacoustic spectroscopy, Blood vessels, Photoacoustic imaging, Interferometers, Ultrasonics, Adhesives, Tissues, Beam splitters, Crystals, Natural surfaces

Read Abstract +

Proceedings Article | 23 February 2012 Paper

Paper

Single mode polymer fiber line detector for photoacoustic tomography

Hubert Grün, Thomas Berer, Karoline Felbermayer, Robert Nuster, Günther Paltauf, Peter Burgholzer

Proceedings Volume 8223, 822337 (2012) https://doi.org/10.1117/12.908313

KEYWORDS: Polymers, Sensors, Glasses, Phase shifts, Polymer optical fibers, Interferometers, Spatial resolution, Optical fibers, Connectors, Photoacoustic tomography

Read Abstract +

Proceedings Article | 23 February 2012 Paper

Paper

Spatial resolution and sensitivity in photoacoustic tomography taking noise into account: from point-like detectors to large integrating detectors

Peter Burgholzer, Thomas Berer, Hubert Grün, Robert Nuster, Günther Paltauf

Proceedings Volume 8223, 822321 (2012) https://doi.org/10.1117/12.908451

KEYWORDS: Sensors, Signal detection, Spatial resolution, Acoustics, Photoacoustic tomography, Signal to noise ratio, Interference (communication), Reconstruction algorithms, Photoacoustic imaging, Photoacoustic spectroscopy

Read Abstract +

Proceedings Article | 16 June 2011 Paper

Paper

Operating point stabilization of fiber-based line detectors for photoacoustic imaging

Karoline Felbermayer, Hubert Grün, Thomas Berer, Peter Burgholzer

Proceedings Volume 8090, 809011 (2011) https://doi.org/10.1117/12.889097

KEYWORDS: Signal detection, Fringe analysis, Sensors, Polymer optical fibers, Interferometers, Photoacoustic imaging, Ultrasonics, Fabry–Perot interferometry, Optical fibers, Glasses

Read Abstract +

Proceedings Article | 18 May 2011 Paper

Paper

Fiber-based broadband ultrasound detector for photoacoustic imaging

Hubert Grün, Thomas Berer, Karoline Felbermayer, Peter Burgholzer, Günther Paltauf

Proceedings Volume 7753, 77536X (2011) https://doi.org/10.1117/12.884647

KEYWORDS: Sensors, Optical fibers, Interferometers, Polymers, Signal detection, Photoacoustic imaging, Glasses, Photoacoustic spectroscopy, Fabry–Perot interferometry, Fiber Bragg gratings

Read Abstract +

Proceedings Article | 25 March 2011 Paper

Paper

Photoacoustic tomography with integrating fiber-based annular detectors

H. Grün, H. Altmisdört, T. Berer, G. Paltauf, G. Zangerl, M. Haltmeier, P. Burgholzer

Proceedings Volume 7968, 79680B (2011) https://doi.org/10.1117/12.877980

KEYWORDS: Sensors, Photoacoustic tomography, Tomography, Image restoration, Signal detection, Spatial resolution, Glasses, Photoacoustic imaging, Absorption, Photoacoustic spectroscopy

Read Abstract +

Proceedings Article | 23 February 2011 Paper

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

Read Abstract +

SPIE Journal Paper | 1 March 2010 Open Access

Open Access

Three-dimensional photoacoustic imaging using fiber-based line detectors

Hubert Grün, Thomas Berer, Peter Burgholzer, Robert Nuster, Günther Paltauf

JBO, Vol. 15, Issue 02, 021306, (March 2010) https://doi.org/10.1117/12.10.1117/1.3381186

KEYWORDS: Sensors, Optical fibers, 3D image processing, Photoacoustic imaging, Interferometers, Image sensors, Glasses, Polymers, Photoacoustic spectroscopy, Signal detection

Read Abstract +

Proceedings Article | 24 February 2010 Paper

Paper

Polymer fiber detectors for photoacoustic imaging

Hubert Grün, Thomas Berer, Karoline Pühringer, Robert Nuster, Günther Paltauf, Peter Burgholzer

Proceedings Volume 7564, 75640M (2010) https://doi.org/10.1117/12.840627

KEYWORDS: Sensors, Polymers, Glasses, Fabry–Perot interferometry, Polymer optical fibers, Photoacoustic spectroscopy, Photoacoustic imaging, Signal detection, Image sensors, Spatial resolution

Read Abstract +

Proceedings Article | 10 July 2009 Paper

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

Read Abstract +

Proceedings Article | 10 July 2009 Paper

Paper

Photoacoustic microscopy with large integrating optical annular detectors

Thomas Berer, Hubert Grün, Christian Hofer, Peter Burgholzer

Proceedings Volume 7371, 73710X (2009) https://doi.org/10.1117/12.831737

KEYWORDS: Sensors, Fourier transforms, Acoustics, Signal detection, Polymer optical fibers, Photoacoustic spectroscopy, Deconvolution, Algorithm development, Interferometers, Optical fibers

Read Abstract +

Proceedings Article | 10 July 2009 Paper

Paper

Fiber-based detectors for photoacoustic imaging

Hubert Grün, Thomas Berer, Robert Nuster, Günther Paltauf, Peter Burgholzer

Proceedings Volume 7371, 73710T (2009) https://doi.org/10.1117/12.831739

KEYWORDS: Sensors, Optical fibers, Polymers, Glasses, Fabry–Perot interferometers, Signal detection, Photoacoustic imaging, Interferometers, Image sensors, Polymer optical fibers

Read Abstract +

Proceedings Article | 13 March 2009 Paper

Paper

Photoacoustic imaging with integrating line detectors

Hubert Grün, Thomas Berer, Armin Hochreiner, Robert Nuster, Günther Paltauf, Peter Burgholzer

Proceedings Volume 7265, 72650K (2009) https://doi.org/10.1117/12.811009

KEYWORDS: Sensors, Interferometers, Photoacoustic imaging, Photoacoustic spectroscopy, Reflection, Ultrasonics, Fabry–Perot interferometry, Photoacoustic tomography, Ultrasonography, Mach-Zehnder interferometers

Read Abstract +

Proceedings Article | 25 February 2009 Paper

Paper

Comparison of optical and piezoelectric integrating line detectors

R. Nuster, S. Gratt, K. Passler, H. Grün, Th. Berer, P. Burgholzer, G. Paltauf

Proceedings Volume 7177, 71770T (2009) https://doi.org/10.1117/12.808873

KEYWORDS: Sensors, Signal detection, Acoustics, Ferroelectric polymers, Mach-Zehnder interferometers, Glasses, Integrated optics, Polymers, Acquisition tracking and pointing, Polymer thin films

Read Abstract +

Proceedings Article | 4 March 2008 Paper

Paper

Photoacoustic tomography of heterogeneous media using a model-based time reversal method

Hubert Grün, Robert Nuster, Günther Paltauf, Markus Haltmeier, Peter Burgholzer

Proceedings Volume 6856, 685620 (2008) https://doi.org/10.1117/12.763111

KEYWORDS: Sensors, Model-based design, Photoacoustic spectroscopy, Acoustics, Bone, Photoacoustic tomography, Wave propagation, Image restoration, Reconstruction algorithms, Head

Read Abstract +

Proceedings Article | 17 July 2007 Paper

Paper

Photoacoustic tomography using a fiber based Fabry-Perot interferometer as an integrating line detector and image reconstruction by model-based time reversal method

H. Grün, G. Paltauf, M. Haltmeier, P. Burgholzer

Proceedings Volume 6631, 663107 (2007) https://doi.org/10.1117/12.729475

KEYWORDS: Sensors, Acoustics, Fabry–Perot interferometry, Interferometers, Signal detection, Fiber Bragg gratings, Photoacoustic spectroscopy, Coating, Bone, Reflectivity

Read Abstract +

Photoacoustic imaging is based on the generation of acoustic waves in a semitransparent sample (e.g. soft tissue) after illumination with short pulses of light or radio waves. The goal is to recover the spatial distribution of absorbed energy density inside the sample from acoustic pressure signals measured outside the sample (photoacoustic inverse problem). If the acoustic pressure outside the illuminated sample is measured with a large-aperture detector, the signal at a certain time is given by an integral of the generated acoustic pressure distribution over an area that is determined by the shape of the detector. For example a planar detector measures the projections of the initial pressure distribution over planes parallel to the detector plane, which is the Radon transform of the initial pressure distribution. Stable and exact three-dimensional imaging with planar integrating detector requires measurements in all directions of space and so the receiver plane has to be rotated to cover the entire detection surface. We have recently presented a simpler set-up for exact imaging which requires only a single rotation axis and therefor the fragmentation of the area detector into line detectors perpendicular to the rotation axis. Using a two-dimensional reconstruction method and applying the inverse two-dimensional Radon transform afterwards gives an exact reconstruction of the three-dimensional sample with this set-up. In order to achieve high resolution, a fiber based Fabry-Perot interferometer is used. It is a single mode fiber with two fiber bragg gratings on both ends of the line detector. Thermal shifts and vibrations are compensated by frequency locking of the laser. The high resolution and the good performance of this integrating line detector has been demonstrated by photoacoustic measurements with line grid samples and phantoms using a model-based time reversal method for image reconstruction. The time reversed pressure field can be calculated directly by retransmitting the measured pressure on the detector positions in a reversed temporal order.

Proceedings Article | 13 February 2007 Paper

Paper

Compensation of acoustic attenuation for high-resolution photoacoustic imaging with line detectors

Peter Burgholzer, Hubert Grün, Markus Haltmeier, Robert Nuster, Günther Paltauf

Proceedings Volume 6437, 643724 (2007) https://doi.org/10.1117/12.700723

KEYWORDS: Sensors, Acoustics, Signal attenuation, Signal detection, Absorption, Photoacoustic imaging, Photoacoustic spectroscopy, Reconstruction algorithms, Radon transform, 3D image processing

Read Abstract +

Showing 5 of 24 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement