Microwavephysics and Atmospheric Physics
Biomedizinische Photonik
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Ultrafast Science and Technology
Last update: 18.10.2017
FS 2015: Seminare über Biomedizinische Photonik
Wednesday 10-12
Vorträge, die innerhalb der nächsten Tage stattfinden, sind speziell markiert.
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Mittwoch, 18.02.2015

Investigation of deep clinical OA imaging of large blood vessels

Zeit: 10:15 Uhr
Hörsaal: A97
 
Dr. Michael Jaeger
Institute of Applied Physics
University of Bern

 
Mittwoch, 25.02.2015

On the photon diffusion coefficient: the role of the absorption and persistence length

Zeit: 10:15 Uhr
Hörsaal: A97
 
Dr. Günhan Akarçay
Institute of Applied Physics
University of Bern

 
Mittwoch, 04.03.2015

On microscopes, resolution, and super-resolution

Zeit: 10:15 Uhr
Hörsaal: A97
 
Prof. Jaro Ricka
Institute of Applied Physics
University of Bern

 
Mittwoch, 11.03.2015

Photoacoustic Microscopy and its application for brain imaging of malaria infected mice

Zeit: 10:15 Uhr
Hörsaal: A97
 
Dr. Robert Nuster
Institute of Applied Physics
University of Bern

 
Mittwoch, 18.03.2015

Light propagation through scattering media: theory, experiments and applications

Zeit: 10:15 Uhr
Hörsaal: A97
 
Prof. Alwin Kienle
Institut für Lasertechnologien, Universität Ulm, Germany

Light propagation through scattering media is investigated in the microscopic, mesoscopic and macroscopic scales using analytical and numerical solutions of Maxwell's equations, the radiative transport equation and its approximations. Experiments in the different scales are presented. Finally, biomedical and technical applications based on the theoretical and experimental basic research are shown.

 
Mittwoch, 25.03.2015

Optoacoustic measurements of optical effective attenuation for multi-wavelength fluence compensation

Zeit: 10:15 Uhr
Hörsaal: A97
 
Gerrit Held
Institute of Applied Physics
University of Bern

 
Mittwoch, 01.04.2015

Combination of optoacoustic imaging and diffuse optical tomography for cerebral oxygenation map in preterm neonates

Zeit: 10:15 Uhr
Hörsaal: A97
 
Dr. Parisa Farzam
Institute of Applied Physics
University of Bern

 
Mittwoch, 08.04.2015

Water phase diagram in metastable region-data analyse

Zeit: 10:15 Uhr
Hörsaal: A97
 
Chen Qiu
Institute of Applied Physics
University of Bern

 
Mittwoch, 22.04.2015

Analysis and Improvement of Optoacoustic Microscopy Signals

Zeit: 10:15 Uhr
Hörsaal: A97
 
Florentin Spadin
Institute of Applied Physics
University of Bern

 
Mittwoch, 29.04.2015

Fluence compensation of optoacoustic images using Near-infrared tomography and Monte Carlo simulations

Zeit: 10:15 Uhr
Hörsaal: A97
 
Tigran Petrosyan
Institute of Applied Physics
University of Bern

 
Donnerstag, 07.05.2015

Towards a better understanding of clinical optoacoustic imaging using a linear array transducer (Thesis Defense)

Zeit: 16:15 Uhr
Hörsaal: B7
 
Stefan Preisser
Institute of Applied Physics
University of Bern

 
Freitag, 08.05.2015

Fluence corrected photoacoustic imaging using acousto-optic light tagging

Zeit: 10:15 Uhr
Hörsaal: B78
 
Prof. Wiendelt Steenbergen
Biomedical Photonic Imaging Group
MIRA Institute of Biomedical Technology and Technical Medicine
University of Twente
Enschede, NL

Photoacoustic imaging is seeing a rapid development, both in terms of technology and applications. Acousto-optic tissue imaging, on the other hand, has become a silent area of research after a promising start: it appeared to be a solution of moderate quality for a nonobvious problem. In my talk I will demonstrate how a fusion of photoacoustics and acousto-optics can lead to a quantitative imaging modality in which photoacoustic images are corrected for the distribution of local excitation fluence. After presenting the underlying idea I will give some basic validations, and I will show how the method can be practically applied in a conceptually simple manner, using a single light source, and with the ability to overcome the challenge of tissue dynamics which until now was a problem in acousto-optics.

 
Mittwoch, 13.05.2015

Adventures of a physicist lost in a neuro-intensive care unit (Bern Physics Colloqium)

Zeit: 16:15 Uhr
Hörsaal: B6
 
Prof. Turgut Durduran
ICFO Barcelona, Spain

Do photons propagate through the scalp and skull into the human brain? Once this question was answered positively the next question was whether they carry useful information for biomedical uses. That was also positive. Then came along the physicists who knew about laser speckles and their statistics who asked if that is useful in order to measure the scatterer dynamics. I will describe the basics of photon diffusion through the tissues, the speckle dynamics and how they form the basis of a relatively new technology called "diffuse correlation spectroscopy". This new technology allowed us to measure blood floow in deep tissues in a non-invasive and safe manner. I will describe how I was personally involved in these developments that started from the benchtop and gone deep into the neurology-intensive care management. I will conclude with the current status of commercialization efforts and provide some speculations about the future.

 
Montag, 18.05.2015

The simplified approach to the calculation of the energy dissipation for the model of the epithelial cells movement

Zeit: 10:15 Uhr
Hörsaal: A97
 
Ekaterina Makhrova
Institute of Applied Physics
University of Bern

 
Mittwoch, 27.05.2015

Chromophore-loaded electrospun patch for laser assisted vascular anastomosis

Zeit: 10:15 Uhr
Hörsaal: A97
 
Annemarie Schönfeld
Institute of Applied Physics
University of Bern

 
Mittwoch, 03.06.2015

Modelling Self-Organized Mucociliary Transport in Terms of Adaptive Boolean Networks

Zeit: 10:15 Uhr
Hörsaal: A97
 
Martin Schneiter
Institute of Applied Physics
University of Bern

 
Mittwoch, 10.06.2015

Struggles, improvements and possible errors for nerve stimulation in worms

Zeit: 10:15 Uhr
Hörsaal: A97
 
Martina Föhn
Institute of Applied Physics
University of Bern

 
Dienstag, 07.07.2015

Fiber-optic and opto-tetrode implants to measure neuronal calcium signals in deep brain regions in the mouse

Zeit: 13:15 Uhr
Hörsaal: A97
 
Dr. Yaroslav Sych
Brain Research Institute
University of Zurich

We designed miniaturized optical-fiber implants and an optical system for chronic bulk-recording of calcium signals through implanted fibers. With this setup fluorescence from neuronal populations expressing a genetically encoded calcium indicator (e.g. GCaMP6m) in specific subcortical brain areas is detected by a 100-micron diameter optical fiber. We also combined the fiber implant with four tetrodes (opto-tetrode) positioned and glued symmetrically around the fiber with the tetrode tips cut at the level of the fiber tip. Opto-tetrodes were attached to microdrives that allow slow advancements of the fiber and electrode tips over days. Using this type of chronic implant, simultaneous measurements of local field potential, multi- and single unit activity along with the bulk fluorescence signals from labeled populations in front of the fiber are possible. This combined electrophysiological and optical approach allows to decompose synchronous network activity as detected though the "optical fiber" channel into contributions from functionally distinct subpopulations of cells. As an example application we performed depth-resolved measurements of neuronal activity along an opto-tetrode track from deep layers (L5/6) of primary somatosensory cortex (S1Tr) to hippocampus (dorsal CA1) in head-fixed mice trained to perform a go/no-go texture discrimination task (lick/no-lick on target texture: 'Hit'/'Miss'; lick/no-lick on non-target texture: 'False alarm'/'Correct reject'; water droplet as reward in correct trials). After few successive sessions the opto-tetrode was advanced into the hippocampus. At the depth of 1.2 mm from the brain surface (in the dorsal CA1), spike waveforms with significantly increased amplitude and duration were recorded from several neurons. Distinct subpopulations of neurons were observed, showing trial-related firing rate changes during the texture discrimination task. Neurons that were active selectively during either go or no-go trials displayed different latencies with respect to the onset of texture presentation. Similarly the fiber-optic fluorescence signals changed from representing a tonic neuronal excitation prior to the texture display in L5/6 of S1Tr to a response informing on the reward time in CA1. Notably, fluorescence signals in CA1 showed the highest trial-to-trial variability, indicating elevated complexity of neuronal population dynamics. These results demonstrate the feasibility of chronic fiber-optic and opto-tetrode implants to resolve behavior-related neuronal activity patterns from deep brain regions.

 
Mittwoch, 08.07.2015

Developmental tissue dynamics using non-diffracting microscopy

Zeit: 10:15 Uhr
Hörsaal: A97
 
Sascha Reidt
University of Dundee
School of Medicine
Division of Imaging and Technology
Dundee, Scotland, UK