Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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Naji, M.
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Sack, I.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (23/23 displayed)

  • 2024On the relationship between viscoelasticity and water diffusion in soft biological tissues.3citations
  • 2022Mechanical behavior of the hippocampus and corpus callosum: An attempt to reconcile ex vivo with in vivo and micro with macro properties.18citations
  • 2021Real-Time Multifrequency MR Elastography of the Human Brain Reveals Rapid Changes in Viscoelasticity in Response to the Valsalva Maneuver.19citations
  • 2020Cardiac-gated steady-state multifrequency magnetic resonance elastography of the brain: Effect of cerebral arterial pulsation on brain viscoelasticity.25citations
  • 2019Sensitivity of multifrequency magnetic resonance elastography and diffusion-weighted imaging to cellular and stromal integrity of liver tissue.12citations
  • 2018Combining viscoelasticity, diffusivity and volume of the hippocampus for the diagnosis of Alzheimer's disease based on magnetic resonance imaging.86citations
  • 2015Tabletop magnetic resonance elastography for the measurement of viscoelastic parameters of small tissue samples.27citations
  • 2014High-resolution mechanical imaging of the kidney.27citations
  • 2014Wideband MRE and static mechanical indentation of human liver specimen: sensitivity of viscoelastic constants to the alteration of tissue structure in hepatic fibrosis.42citations
  • 2014In vivo time-harmonic multifrequency elastography of the human liver.39citations
  • 2013Compression-sensitive magnetic resonance elastography.18citations
  • 2013Isovolumetric elasticity alteration in the human heart detected by in vivo time-harmonic elastography.18citations
  • 2012Fractal network dimension and viscoelastic powerlaw behavior: I. A modeling approach based on a coarse-graining procedure combined with shear oscillatory rheometry.58citations
  • 2010Viscoelasticity-based MR elastography of skeletal muscle.95citations
  • 2010Viscoelasticity-based staging of hepatic fibrosis with multifrequency MR elastography.207citations
  • 2010Viscoelastic properties of liver measured by oscillatory rheometry and multifrequency magnetic resonance elastography.93citations
  • 2008Non-invasive measurement of brain viscoelasticity using magnetic resonance elastography.280citations
  • 2008Assessment of liver viscoelasticity using multifrequency MR elastography.231citations
  • 2007Three-dimensional analysis of shear wave propagation observed by in vivo magnetic resonance elastography of the brain.84citations
  • 2007Noninvasive assessment of the rheological behavior of human organs using multifrequency MR elastography: a study of brain and liver viscoelasticity.295citations
  • 2006Shear wave group velocity inversion in MR elastography of human skeletal muscle.117citations
  • 2003Electromagnetic actuator for generating variably oriented shear waves in MR elastography.36citations
  • 2002Analysis of wave patterns in MR elastography of skeletal muscle using coupled harmonic oscillator simulations.citations

Places of action

Chart of shared publication
Safraou, Y.
1 / 1 shared
Pagel, K.
1 / 6 shared
Rg, Wells
1 / 1 shared
Braun, J.
6 / 35 shared
Pa, Dantas De Moraes
1 / 1 shared
Zappe, A.
1 / 1 shared
Tzschätzsch, H.
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Im, Sauer
1 / 3 shared
Kh, Hillebrandt
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Meyer, Tom
1 / 1 shared
Guo, J.
7 / 22 shared
Bernarding, J.
2 / 2 shared
Snellings, J.
1 / 1 shared
Budday, S.
1 / 5 shared
Herthum, H.
2 / 2 shared
Shahryari, M.
2 / 2 shared
Bertalan, G.
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Morr, A.
1 / 1 shared
Franze, K.
1 / 1 shared
Rd, Greenhalgh
1 / 1 shared
Schröder, L.
1 / 1 shared
Alzheimer, C.
1 / 1 shared
Becker, J.
1 / 9 shared
Braun, Jürgen
17 / 26 shared
Schrank, F.
3 / 4 shared
Görner, S.
1 / 1 shared
Warmuth, Carsten
2 / 2 shared
Hetzer, S.
1 / 1 shared
Neubauer, H.
1 / 1 shared
Pfeuffer, J.
1 / 1 shared
Hirsch, S.
5 / 6 shared
Kreft, B.
1 / 1 shared
Elgeti, T.
1 / 1 shared
Aa, De Schellenberger
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Polchlopek, B.
1 / 1 shared
Garczynska, K.
1 / 1 shared
Pa, Janmey
1 / 1 shared
Lm, Gerischer
1 / 1 shared
Köbe, T.
1 / 1 shared
Fehlner, A.
1 / 1 shared
Antonenko, D.
1 / 1 shared
Grittner, U.
1 / 2 shared
Flöel, A.
1 / 2 shared
Prehn, K.
1 / 2 shared
Ipek-Ugay, S.
2 / 2 shared
Ledwig, M.
1 / 1 shared
Drießle, T.
1 / 1 shared
Kj, Streitberger
2 / 2 shared
Fischer, T.
2 / 16 shared
Somasundaram, Rajan
3 / 3 shared
Seehofer, D.
1 / 1 shared
Kamphues, C.
1 / 1 shared
Jöhrens, K.
1 / 1 shared
Freise, C.
1 / 1 shared
Asbach, P.
4 / 4 shared
Reiter, R.
1 / 2 shared
Stockmann, M.
1 / 3 shared
Samani, A.
1 / 1 shared
Schultz, M.
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Gentz, E.
1 / 1 shared
Klaua, R.
2 / 2 shared
Tzschaetzsch, H.
1 / 1 shared
Beyer, F.
1 / 4 shared
Papazoglou, S.
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Hättasch, R.
1 / 1 shared
Knebel, F.
1 / 1 shared
Kv, Jenderka
1 / 1 shared
Posnansky, O.
1 / 1 shared
Klatt, D.
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Loddenkemper, C.
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Hamm, B.
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Muche, M.
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Rieger, A.
1 / 1 shared
Schlosser, B.
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Biermer, M.
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Berg, T.
1 / 2 shared
Korth, Y.
1 / 1 shared
Vogt, R.
1 / 1 shared
Friedrich, C.
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Beierbach, B.
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Hamhaber, U.
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Rump, J.
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Braun, K.
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Co-Authors (by relevance)

  • Safraou, Y.
  • Pagel, K.
  • Rg, Wells
  • Braun, J.
  • Pa, Dantas De Moraes
  • Zappe, A.
  • Tzschätzsch, H.
  • Im, Sauer
  • Kh, Hillebrandt
  • Meyer, Tom
  • Guo, J.
  • Bernarding, J.
  • Snellings, J.
  • Budday, S.
  • Herthum, H.
  • Shahryari, M.
  • Bertalan, G.
  • Morr, A.
  • Franze, K.
  • Rd, Greenhalgh
  • Schröder, L.
  • Alzheimer, C.
  • Becker, J.
  • Braun, Jürgen
  • Schrank, F.
  • Görner, S.
  • Warmuth, Carsten
  • Hetzer, S.
  • Neubauer, H.
  • Pfeuffer, J.
  • Hirsch, S.
  • Kreft, B.
  • Elgeti, T.
  • Aa, De Schellenberger
  • Polchlopek, B.
  • Garczynska, K.
  • Pa, Janmey
  • Lm, Gerischer
  • Köbe, T.
  • Fehlner, A.
  • Antonenko, D.
  • Grittner, U.
  • Flöel, A.
  • Prehn, K.
  • Ipek-Ugay, S.
  • Ledwig, M.
  • Drießle, T.
  • Kj, Streitberger
  • Fischer, T.
  • Somasundaram, Rajan
  • Seehofer, D.
  • Kamphues, C.
  • Jöhrens, K.
  • Freise, C.
  • Asbach, P.
  • Reiter, R.
  • Stockmann, M.
  • Samani, A.
  • Schultz, M.
  • Gentz, E.
  • Klaua, R.
  • Tzschaetzsch, H.
  • Beyer, F.
  • Papazoglou, S.
  • Hättasch, R.
  • Knebel, F.
  • Kv, Jenderka
  • Posnansky, O.
  • Klatt, D.
  • Loddenkemper, C.
  • Hamm, B.
  • Muche, M.
  • Rieger, A.
  • Schlosser, B.
  • Biermer, M.
  • Berg, T.
  • Korth, Y.
  • Vogt, R.
  • Friedrich, C.
  • Beierbach, B.
  • Hamhaber, U.
  • Rump, J.
  • Braun, K.
OrganizationsLocationPeople

article

Cardiac-gated steady-state multifrequency magnetic resonance elastography of the brain: Effect of cerebral arterial pulsation on brain viscoelasticity.

  • Schrank, F.
  • Braun, J.
  • Warmuth, Carsten
  • Sack, I.
  • Tzschätzsch, H.
  • Hirsch, S.
  • Kreft, B.
  • Elgeti, T.
Abstract

In-vivo brain viscoelasticity measured by magnetic resonance elastography (MRE) is a sensitive imaging marker for long-term biophysical changes in brain tissue due to aging and disease; however, it is still unknown whether MRE can reveal short-term periodic alterations of brain viscoelasticity related to cerebral arterial pulsation (CAP). We developed cardiac-gated steady-state MRE (ssMRE) with spiral readout and stroboscopic sampling of continuously induced mechanical vibrations in the brain at 20, 31.25, and 40 Hz frequencies. Maps of magnitude |G*| and phase ϕ of the complex shear modulus were generated by multifrequency dual visco-elasto inversion with a temporal resolution of 40 ms over 4 s. The method was tested in 12 healthy volunteers. During cerebral systole, |G*| decreased by 6.6 ± 1.9% (56 ± 22 Pa, p  < 0.001, mean ± SD), whereas ϕ increased by 0.5 ± 0.5% (0.006 ± 0.005 rad, p  = 0.002). The effect size of CAP-induced softening slightly decreased with age by 0.10 ± 0.05% per year ( p  = 0.04), indicating lower cerebral vascular compliance in older individuals. Our data show for the first time that the brain softens and becomes more viscous during systole, possibly due to an effect of CAP-induced arterial expansion and increased blood volume on effective-medium tissue properties. This sensitivity to vascular-solid tissue interactions makes ssMRE potentially useful for detection of cerebral vascular disease.

Topics
  • impedance spectroscopy
  • phase
  • mass spectrometry
  • viscoelasticity
  • aging
  • aging