Observation of nonlinear shear wave propagation using magnetic resonance elastography. Sack, I., McGowan, C. K., Samani, A., Luginbuhl, C., Oakden, W., & Plewes, D. B. Magn Reson Med, 52(4):842--850, Oct, 2004. ![Observation of nonlinear shear wave propagation using magnetic resonance elastography. [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex MR elastography (MRE) is an MRI modality that is increasingly being used to image tissue elasticity throughout the body. One MRE technique that has received a great deal of attention is based on visualizing shear waves, which reveal stiffness by virtue of their local wavelength. However, the shape of propagating shear waves can also provide valuable information about the nonlinear stress-strain behavior of tissue. Here an experiment is proposed that allows the observation of nonlinear wave propagation based on spatial-temporal phase contrast images. A theoretical description of the wave propagation was developed that reflects typical MRE excitation, which involves excitation modes both parallel and perpendicular to B0. Based on this model, it is shown that both odd and even higher harmonics are produced with their amplitudes dependent on the details of the actuator, imaging geometry, and the nonlinear tissue properties. With appropriate motion encoding, harmonic vibrations arising from nonlinear tissue response can be detected. The effect is demonstrated on an agarose gel phantom using a sinusoidal shear vibration of 150 Hz, and clearly shows the presence of harmonics at 600 and 750 Hz. Using an estimate of the strain energy of the phantom, we were able to determine the nonlinear tissue properties.
@article{ Sack2004,
author = {Sack, Ingolf and McGowan, Christopher K. and Samani, Abbas and Luginbuhl,
Chris and Oakden, Wendy and Plewes, Donald B.},
title = {Observation of nonlinear shear wave propagation using magnetic resonance
elastography.},
journal = {Magn Reson Med},
year = {2004},
volume = {52},
pages = {842--850},
number = {4},
month = {Oct},
abstract = {MR elastography (MRE) is an MRI modality that is increasingly being
used to image tissue elasticity throughout the body. One MRE technique
that has received a great deal of attention is based on visualizing
shear waves, which reveal stiffness by virtue of their local wavelength.
However, the shape of propagating shear waves can also provide valuable
information about the nonlinear stress-strain behavior of tissue.
Here an experiment is proposed that allows the observation of nonlinear
wave propagation based on spatial-temporal phase contrast images.
A theoretical description of the wave propagation was developed that
reflects typical MRE excitation, which involves excitation modes
both parallel and perpendicular to B0. Based on this model, it is
shown that both odd and even higher harmonics are produced with their
amplitudes dependent on the details of the actuator, imaging geometry,
and the nonlinear tissue properties. With appropriate motion encoding,
harmonic vibrations arising from nonlinear tissue response can be
detected. The effect is demonstrated on an agarose gel phantom using
a sinusoidal shear vibration of 150 Hz, and clearly shows the presence
of harmonics at 600 and 750 Hz. Using an estimate of the strain energy
of the phantom, we were able to determine the nonlinear tissue properties.},
doi = {10.1002/mrm.20238},
institution = {Institute of Radiology, Charit�-University Medicine Berlin, Humboldt
University Berlin, Berlin, Germany.},
keywords = {Elasticity; Gels; Magnetic Resonance Imaging, methods; Phantoms, Imaging;
Sepharose; Shear Strength; Vibration},
language = {eng},
medline-pst = {ppublish},
owner = {Heiko},
pmid = {15389935},
timestamp = {2013.07.26},
url = {http://dx.doi.org/10.1002/mrm.20238}
}
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B.</span>\n\t<!-- <span class=\"bibbase_paper_year\">2004</span>. -->\n</span>\n\n\n\n<i>Magn Reson Med</i>,\n\n52(4):842--850.\n\nOct 2004.\n\n\n\n\n<br class=\"bibbase_paper_content\"/>\n\n<span class=\"bibbase_paper_content\">\n \n \n <!-- <i -->\n <!-- onclick=\"javascript:log_download('sack-mcgowan-samani-luginbuhl-oakden-plewes-observationofnonlinearshearwavepropagationusingmagneticresonanceelastography-2004', 'http://dx.doi.org/10.1002/mrm.20238')\">DEBUG -->\n <!-- </i> -->\n\n <a href=\"http://dx.doi.org/10.1002/mrm.20238\"\n onclick=\"javascript:log_download('sack-mcgowan-samani-luginbuhl-oakden-plewes-observationofnonlinearshearwavepropagationusingmagneticresonanceelastography-2004', 'http://dx.doi.org/10.1002/mrm.20238')\">\n <img src=\"http://www.bibbase.org/img/filetypes/blank.png\"\n\t alt=\"Observation of nonlinear shear wave propagation using magnetic resonance elastography. [.20238]\" \n\t class=\"bibbase_icon\"\n\t style=\"width: 24px; height: 24px; border: 0px; vertical-align: text-top\" ><span class=\"bibbase_icon_text\">Paper</span></a> \n \n \n <a href=\"javascript:showBib('Sack2004')\">\n <img src=\"http://www.bibbase.org/img/filetypes/bib.png\" \n\t alt=\"Observation of nonlinear shear wave propagation using magnetic resonance elastography. [bib]\" \n\t class=\"bibbase_icon\"\n\t style=\"width: 24px; height: 24px; border: 0px; vertical-align: text-top\"><span class=\"bibbase_icon_text\">Bibtex</span></a>\n \n \n\n \n \n \n \n \n\n \n <a class=\"bibbase_abstract_link\" href=\"javascript:showAbstract('Sack2004')\">Abstract</a>\n \n \n</span>\n\n<!-- -->\n<!-- <div id=\"abstract_Sack2004\"> -->\n<!-- MR elastography (MRE) is an MRI modality that is increasingly being used to image tissue elasticity throughout the body. One MRE technique that has received a great deal of attention is based on visualizing shear waves, which reveal stiffness by virtue of their local wavelength. However, the shape of propagating shear waves can also provide valuable information about the nonlinear stress-strain behavior of tissue. Here an experiment is proposed that allows the observation of nonlinear wave propagation based on spatial-temporal phase contrast images. A theoretical description of the wave propagation was developed that reflects typical MRE excitation, which involves excitation modes both parallel and perpendicular to B0. Based on this model, it is shown that both odd and even higher harmonics are produced with their amplitudes dependent on the details of the actuator, imaging geometry, and the nonlinear tissue properties. With appropriate motion encoding, harmonic vibrations arising from nonlinear tissue response can be detected. The effect is demonstrated on an agarose gel phantom using a sinusoidal shear vibration of 150 Hz, and clearly shows the presence of harmonics at 600 and 750 Hz. Using an estimate of the strain energy of the phantom, we were able to determine the nonlinear tissue properties. -->\n<!-- </div> -->\n<!-- -->\n\n</div>\n","downloads":0,"abstract":"MR elastography (MRE) is an MRI modality that is increasingly being used to image tissue elasticity throughout the body. One MRE technique that has received a great deal of attention is based on visualizing shear waves, which reveal stiffness by virtue of their local wavelength. However, the shape of propagating shear waves can also provide valuable information about the nonlinear stress-strain behavior of tissue. Here an experiment is proposed that allows the observation of nonlinear wave propagation based on spatial-temporal phase contrast images. A theoretical description of the wave propagation was developed that reflects typical MRE excitation, which involves excitation modes both parallel and perpendicular to B0. Based on this model, it is shown that both odd and even higher harmonics are produced with their amplitudes dependent on the details of the actuator, imaging geometry, and the nonlinear tissue properties. With appropriate motion encoding, harmonic vibrations arising from nonlinear tissue response can be detected. The effect is demonstrated on an agarose gel phantom using a sinusoidal shear vibration of 150 Hz, and clearly shows the presence of harmonics at 600 and 750 Hz. Using an estimate of the strain energy of the phantom, we were able to determine the nonlinear tissue properties.","author":["Sack, Ingolf","McGowan, Christopher K.","Samani, Abbas","Luginbuhl, Chris","Oakden, Wendy","Plewes, Donald B."],"author_short":["Sack, I.","McGowan, C.<nbsp>K.","Samani, A.","Luginbuhl, C.","Oakden, W.","Plewes, D.<nbsp>B."],"bibtex":"@article{ Sack2004,\n author = {Sack, Ingolf and McGowan, Christopher K. and Samani, Abbas and Luginbuhl,\r\n\tChris and Oakden, Wendy and Plewes, Donald B.},\n title = {Observation of nonlinear shear wave propagation using magnetic resonance\r\n\telastography.},\n journal = {Magn Reson Med},\n year = {2004},\n volume = {52},\n pages = {842--850},\n number = {4},\n month = {Oct},\n abstract = {MR elastography (MRE) is an MRI modality that is increasingly being\r\n\tused to image tissue elasticity throughout the body. One MRE technique\r\n\tthat has received a great deal of attention is based on visualizing\r\n\tshear waves, which reveal stiffness by virtue of their local wavelength.\r\n\tHowever, the shape of propagating shear waves can also provide valuable\r\n\tinformation about the nonlinear stress-strain behavior of tissue.\r\n\tHere an experiment is proposed that allows the observation of nonlinear\r\n\twave propagation based on spatial-temporal phase contrast images.\r\n\tA theoretical description of the wave propagation was developed that\r\n\treflects typical MRE excitation, which involves excitation modes\r\n\tboth parallel and perpendicular to B0. Based on this model, it is\r\n\tshown that both odd and even higher harmonics are produced with their\r\n\tamplitudes dependent on the details of the actuator, imaging geometry,\r\n\tand the nonlinear tissue properties. With appropriate motion encoding,\r\n\tharmonic vibrations arising from nonlinear tissue response can be\r\n\tdetected. The effect is demonstrated on an agarose gel phantom using\r\n\ta sinusoidal shear vibration of 150 Hz, and clearly shows the presence\r\n\tof harmonics at 600 and 750 Hz. Using an estimate of the strain energy\r\n\tof the phantom, we were able to determine the nonlinear tissue properties.},\n doi = {10.1002/mrm.20238},\n institution = {Institute of Radiology, Charit�-University Medicine Berlin, Humboldt\r\n\tUniversity Berlin, Berlin, Germany.},\n keywords = {Elasticity; Gels; Magnetic Resonance Imaging, methods; Phantoms, Imaging;\r\n\tSepharose; Shear Strength; Vibration},\n language = {eng},\n medline-pst = {ppublish},\n owner = {Heiko},\n pmid = {15389935},\n timestamp = {2013.07.26},\n url = {http://dx.doi.org/10.1002/mrm.20238}\n}","bibtype":"article","doi":"10.1002/mrm.20238","id":"Sack2004","institution":"Institute of Radiology, Charit�-University Medicine Berlin, Humboldt University Berlin, Berlin, Germany.","journal":"Magn Reson Med","key":"Sack2004","keywords":"Elasticity; Gels; Magnetic Resonance Imaging, methods; Phantoms, Imaging; Sepharose; Shear Strength; Vibration","language":"eng","medline-pst":"ppublish","month":"Oct","number":"4","owner":"Heiko","pages":"842--850","pmid":"15389935","timestamp":"2013.07.26","title":"Observation of nonlinear shear wave propagation using magnetic resonance elastography.","type":"article","url":"http://dx.doi.org/10.1002/mrm.20238","volume":"52","year":"2004","role":"author","urls":{"Paper":"http://dx.doi.org/10.1002/mrm.20238"},"bibbaseid":"sack-mcgowan-samani-luginbuhl-oakden-plewes-observationofnonlinearshearwavepropagationusingmagneticresonanceelastography-2004"},"bibtype":"article","biburl":"http://home.arcor.de/teambushido/Literatur.bib","downloads":0,"title":"Observation of nonlinear shear wave propagation using magnetic resonance elastography.","year":2004,"dataSources":["z828pEjP7GR5ew7B7"]}