In vivo measurement of volumetric strain in the human brain induced by arterial pulsation and harmonic waves

In vivo measurement of volumetric strain in the human brain induced by arterial pulsation and harmonic waves. Hirsch, S., Klatt, d, D., Freimann, F., Scheel, M., Braun, J., & Sack, I. Magnetic Resonance in Medicine, 2012. cited By (since 1996)2; Article in Press

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Motion-sensitive phase contrast magnetic resonance imaging and magnetic resonance elastography are applied for the measurement of volumetric strain and tissue compressibility in human brain. Volumetric strain calculated by the divergence operator using a biphasic effective-medium model is related to dilatation and compression of fluid spaces during harmonic stimulation of the head or during intracranial passage of the arterial pulse wave. In six volunteers, phase contrast magnetic resonance imaging showed that the central cerebrum expands at arterial pulse wave to strain values of (2.8 ± 1.9)·10 -4. The evolution of volumetric strain agrees well with the magnitude of the harmonic divergence measured in eight volunteers by magnetic resonance elastography using external activation of 25 Hz vibration frequency. Intracranial volumetric strain was proven sensitive to venous pressure altered by abdominal muscle contraction. In eight volunteers, an increase in volumetric strain due to abdominal muscle contraction of approximately 45% was observed (P = 0.0001). The corresponding compression modulus in the range of 9.5-13.5 kPa demonstrated that the compressibility of brain tissue at 25 Hz stimulation is much higher than that of water. This pilot study provides the background for compression-sensitive magnetic resonance imaging with or without external head stimulation. Volumetric strain may be sensitive to fluid flow abnormalities or pressure imbalances between vasculature and parenchyma as seen in hydrocephalus. © 2012 Wiley Periodicals, Inc.

@article{ Hirsch2012,
  author = {Hirsch, S.a  and Klatt, D.a  d  and Freimann, F.b  and Scheel, M.a  and Braun, J.c  and Sack, I.a },
  title = {In vivo measurement of volumetric strain in the human brain induced by arterial pulsation and harmonic waves},
  journal = {Magnetic Resonance in Medicine},
  year = {2012},
  note = {cited By (since 1996)2; Article in Press},
  url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84866505686&partnerID=40&md5=7158c948963be1305639f3e65bb658eb},
  affiliation = {Department of Radiology, Charité - Universitätsmedizin Berlin, Berlin, Germany; Department of Neurosurgery, Charité - University Berlin, Berlin, Germany; Institute of Medical Informatics, Charité - Universitätsmedizin Berlin, Berlin, Germany; Department of Bioengineering, College of Medicine, College of Engineering, The University of Illinois at Chicago, Chicago, Illinois, USA},
  abstract = {Motion-sensitive phase contrast magnetic resonance imaging and magnetic resonance elastography are applied for the measurement of volumetric strain and tissue compressibility in human brain. Volumetric strain calculated by the divergence operator using a biphasic effective-medium model is related to dilatation and compression of fluid spaces during harmonic stimulation of the head or during intracranial passage of the arterial pulse wave. In six volunteers, phase contrast magnetic resonance imaging showed that the central cerebrum expands at arterial pulse wave to strain values of (2.8 ± 1.9)·10 -4. The evolution of volumetric strain agrees well with the magnitude of the harmonic divergence measured in eight volunteers by magnetic resonance elastography using external activation of 25 Hz vibration frequency. Intracranial volumetric strain was proven sensitive to venous pressure altered by abdominal muscle contraction. In eight volunteers, an increase in volumetric strain due to abdominal muscle contraction of approximately 45% was observed (P = 0.0001). The corresponding compression modulus in the range of 9.5-13.5 kPa demonstrated that the compressibility of brain tissue at 25 Hz stimulation is much higher than that of water. This pilot study provides the background for compression-sensitive magnetic resonance imaging with or without external head stimulation. Volumetric strain may be sensitive to fluid flow abnormalities or pressure imbalances between vasculature and parenchyma as seen in hydrocephalus. © 2012 Wiley Periodicals, Inc.},
  author_keywords = {Brain tissue;  Cerebral pulsation;  Compression waves;  Flow field;  Harmonic motion field;  Magnetic resonance elastography;  Poroelastography;  Porosity;  Shear waves;  Venous pressure},
  correspondence_address1 = {Sack, I.; Department of Radiology, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10email: ingolf.sack@charite.de},
  issn = {07403194},
  coden = {MRMEE},
  doi = {10.1002/mrm.24499},
  language = {English},
  abbrev_source_title = {Magn. Reson. Med.},
  document_type = {Article in Press},
  source = {Scopus}
}

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Reson. Med.","abstract":"Motion-sensitive phase contrast magnetic resonance imaging and magnetic resonance elastography are applied for the measurement of volumetric strain and tissue compressibility in human brain. Volumetric strain calculated by the divergence operator using a biphasic effective-medium model is related to dilatation and compression of fluid spaces during harmonic stimulation of the head or during intracranial passage of the arterial pulse wave. In six volunteers, phase contrast magnetic resonance imaging showed that the central cerebrum expands at arterial pulse wave to strain values of (2.8 ± 1.9)·10 -4. The evolution of volumetric strain agrees well with the magnitude of the harmonic divergence measured in eight volunteers by magnetic resonance elastography using external activation of 25 Hz vibration frequency. Intracranial volumetric strain was proven sensitive to venous pressure altered by abdominal muscle contraction. In eight volunteers, an increase in volumetric strain due to abdominal muscle contraction of approximately 45% was observed (P = 0.0001). The corresponding compression modulus in the range of 9.5-13.5 kPa demonstrated that the compressibility of brain tissue at 25 Hz stimulation is much higher than that of water. This pilot study provides the background for compression-sensitive magnetic resonance imaging with or without external head stimulation. Volumetric strain may be sensitive to fluid flow abnormalities or pressure imbalances between vasculature and parenchyma as seen in hydrocephalus. © 2012 Wiley Periodicals, Inc.","affiliation":"Department of Radiology, Charité - Universitätsmedizin Berlin, Berlin, Germany; Department of Neurosurgery, Charité - University Berlin, Berlin, Germany; Institute of Medical Informatics, Charité - Universitätsmedizin Berlin, Berlin, Germany; Department of Bioengineering, College of Medicine, College of Engineering, The University of Illinois at Chicago, Chicago, Illinois, USA","author":["Hirsch, S.a","Klatt","d, D.a","Freimann, F.b","Scheel, M.a","Braun, J.c","Sack, I.a"],"author_keywords":"Brain tissue; Cerebral pulsation; Compression waves; Flow field; Harmonic motion field; Magnetic resonance elastography; Poroelastography; Porosity; Shear waves; Venous pressure","author_short":["Hirsch, S.","Klatt","d, D.","Freimann, F.","Scheel, M.","Braun, J.","Sack, I."],"bibtex":"@article{ Hirsch2012,\n author = {Hirsch, S.a and Klatt, D.a d and Freimann, F.b and Scheel, M.a and Braun, J.c and Sack, I.a },\n title = {In vivo measurement of volumetric strain in the human brain induced by arterial pulsation and harmonic waves},\n journal = {Magnetic Resonance in Medicine},\n year = {2012},\n note = {cited By (since 1996)2; Article in Press},\n url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84866505686&partnerID=40&md5=7158c948963be1305639f3e65bb658eb},\n affiliation = {Department of Radiology, Charité - Universitätsmedizin Berlin, Berlin, Germany; Department of Neurosurgery, Charité - University Berlin, Berlin, Germany; Institute of Medical Informatics, Charité - Universitätsmedizin Berlin, Berlin, Germany; Department of Bioengineering, College of Medicine, College of Engineering, The University of Illinois at Chicago, Chicago, Illinois, USA},\n abstract = {Motion-sensitive phase contrast magnetic resonance imaging and magnetic resonance elastography are applied for the measurement of volumetric strain and tissue compressibility in human brain. Volumetric strain calculated by the divergence operator using a biphasic effective-medium model is related to dilatation and compression of fluid spaces during harmonic stimulation of the head or during intracranial passage of the arterial pulse wave. In six volunteers, phase contrast magnetic resonance imaging showed that the central cerebrum expands at arterial pulse wave to strain values of (2.8 ± 1.9)·10 -4. The evolution of volumetric strain agrees well with the magnitude of the harmonic divergence measured in eight volunteers by magnetic resonance elastography using external activation of 25 Hz vibration frequency. Intracranial volumetric strain was proven sensitive to venous pressure altered by abdominal muscle contraction. In eight volunteers, an increase in volumetric strain due to abdominal muscle contraction of approximately 45% was observed (P = 0.0001). The corresponding compression modulus in the range of 9.5-13.5 kPa demonstrated that the compressibility of brain tissue at 25 Hz stimulation is much higher than that of water. This pilot study provides the background for compression-sensitive magnetic resonance imaging with or without external head stimulation. Volumetric strain may be sensitive to fluid flow abnormalities or pressure imbalances between vasculature and parenchyma as seen in hydrocephalus. © 2012 Wiley Periodicals, Inc.},\n author_keywords = {Brain tissue; Cerebral pulsation; Compression waves; Flow field; Harmonic motion field; Magnetic resonance elastography; Poroelastography; Porosity; Shear waves; Venous pressure},\n correspondence_address1 = {Sack, I.; Department of Radiology, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10email: ingolf.sack@charite.de},\n issn = {07403194},\n coden = {MRMEE},\n doi = {10.1002/mrm.24499},\n language = {English},\n abbrev_source_title = {Magn. Reson. 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