An inductive method to measure mechanical excitation spectra for MRI elastography. Plewes, D‥, Luginbuhl, C., Macgowan, C., & Sack, I. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering, 21(1):32-39, 2004. cited By (since 1996)1![An inductive method to measure mechanical excitation spectra for MRI elastography [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Harmonic MR elastography (MRE) monitors the propagation of acoustic waves in tissues in the audio regime. Oscillatory motions with large amplitudes can induce nonlinear wave propagation effects resulting in harmonics that evolve over space. In order to understand these effects, knowledge of the motions of applied mechanical motion is needed to rule out the presence of harmonic motion arising from the mechanical source. We propose a simple technique to measure the spectral content of mechanical excitation based on the use of a set of detection coils mounted on the elastography excitation system. The motion of these coils causes a small signal to be induced from the applied static magnetic field of the MRI system. A detailed analysis shows that quantitative assessment of excitations is possible with correct geometrical arrangement of the detector coils. However, it shows that nonlinear effects can also occur depending on the alignment of the detection coils with respect to Bo. The system is easy to operate and allows for the time resolved observation of the actuator motion for each experimental setup. The system is intended to be used before and after MRE experiments to determine excitation spectral content and repeatability. We demonstrate its use in a one-dimensional elastography experiment and show that this information is an essential prerequisite for studying material nonlinear elastic properties using MRE. © 2004 Wiley Periodicals, Inc.
@article{ Plewes200432,
author = {Plewes, D.B.a and Luginbuhl, C.a and Macgowan, C.b and Sack, I.c },
title = {An inductive method to measure mechanical excitation spectra for MRI elastography},
journal = {Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering},
year = {2004},
volume = {21},
number = {1},
pages = {32-39},
note = {cited By (since 1996)1},
url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-4744371690&partnerID=40&md5=49c28e19952849439c59647f98abb7af},
affiliation = {Imaging Research, Sunnybrook Women's Coll. Hlth. S., University of Toronto, Toronto, Ont., Canada; Department of Medical Imaging, Hospital for Sick Children, University of Toronto, Toronto, Ont., Canada; Department of Medical Informatics, Univ. Hospital Benjamin Franklin, Free University Berlin, Berlin, Germany},
abstract = {Harmonic MR elastography (MRE) monitors the propagation of acoustic waves in tissues in the audio regime. Oscillatory motions with large amplitudes can induce nonlinear wave propagation effects resulting in harmonics that evolve over space. In order to understand these effects, knowledge of the motions of applied mechanical motion is needed to rule out the presence of harmonic motion arising from the mechanical source. We propose a simple technique to measure the spectral content of mechanical excitation based on the use of a set of detection coils mounted on the elastography excitation system. The motion of these coils causes a small signal to be induced from the applied static magnetic field of the MRI system. A detailed analysis shows that quantitative assessment of excitations is possible with correct geometrical arrangement of the detector coils. However, it shows that nonlinear effects can also occur depending on the alignment of the detection coils with respect to Bo. The system is easy to operate and allows for the time resolved observation of the actuator motion for each experimental setup. The system is intended to be used before and after MRE experiments to determine excitation spectral content and repeatability. We demonstrate its use in a one-dimensional elastography experiment and show that this information is an essential prerequisite for studying material nonlinear elastic properties using MRE. © 2004 Wiley Periodicals, Inc.},
author_keywords = {Elastography; Elastography instrumentation; Nonlinear acoustics; Wave propagation},
keywords = {article; device; elasticity; elastography; geometry; magnetic field; nuclear magnetic resonance imaging; quantitative analysis; technique},
references = {Plewes, D.B., Betty, I., Urchuk, S., Soutar, I., Visualizing tissue compliance with MR (1995) J Magn Reson Imag, 5 (6), pp. 733-738; Muthupillai, R., Lomas, D., Rossman, P., Greenleaf, J., Manduca, A., Ehman, R., MR imaging of acoustic strain waves: Initial in-vivo results (1995) Science, 269, pp. 1854-1857; Bishop, J., Poole, G., Leitch, M., Plewes, D.B., Magnetic resonance imaging of shear wave propagation in excised tissue (1998) J Magn Reson Imag, 8, pp. 1257-1265; Ehman, R.L., Muthupillai, R., Lomas, D.J., Rossman, P.J., Greenleaf, J.F., Manduca, A., Riederer, S.J., Magnetoelastography: MRI of acoustic strain waves (1995) Radiology, 179, p. 335; Lewa, C.J., De Certaines, J.D., MR imaging of viscoelastic properties (1995) J Magn Reson Imag, 5, pp. 242-244; Walker, C.L., Foster, F.S., Plewes, D.B., Magnetic resonance imaging of ultrasonic fields (1998) Ultrasound Med Biol, 24, pp. 137-142; Plewes, D.B., Silver, S., Starkoski, B., Walker, C.L., MRI of ultrasound fields: Gradient characteristics (2000) J Magn Reson Imag, 11 (4), pp. 452-457; Sinkus, R., Weiss, S., Eigger, E., Lorenzen, J., Dargatz, M., Kuhl, C., Non-linear elastic tissue properties of the breast measure by MR-elastography: Initial in-vitro and in-vivo results (2002) Tenth Scientific Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine, , May 18-24, 2002, Honolulu, HI, paper 33; Catheline, S., Gennisson, J., Chaffaï, S., Fink, M., Measuring non-linear elastic parameters of soft tissues using transient elastography (2002) First International Conference on the Ultrasonic Measurement and Imaging of Tissue Elasticity, , October 20-23, 2002, Niagara Falls, Canada; Muthupillai, R., Rossman, P.J., Lomas, D.J., Greenleaf, J.F., Riederer, S.J., Ehman, R.L., Magnetic resonance imaging of transverse acoustic strain waves (1996) Magn Reson Med, 36, pp. 266-274; Uffmann, K., Abicht, C., Quick, H.H., Ulbricht, H., Ladd, M.E., Characterization of an electromagnetic actuator for MR elastography (2001) Proc Intl Soc Magn Reson Med, 9, p. 1636; Model 3B-ST, , Bryston Limited, Peterbourgh, Canada; Hardy, C.J., Cline, H.E., Broadband nuclear magnetic resonance pulses with two-dimensional spatial selectivity (1989) J Appl Phys, 66, pp. 1513-1516; Morse, P.M., Ingard, K.U., (1986) Theoretical Acoustics, p. 874. , Princeton University Press},
correspondence_address1 = {Plewes, D.B.; Imaging Research, Sunnybrook Women's Coll. Hlth. S., University of Toronto, Toronto, Ont., Canada; email: don.plewes@sw.ca},
issn = {10437347},
doi = {10.1002/cmr.b.20011},
language = {English},
abbrev_source_title = {Concepts Magn. Reson. Part B: Magn Reson. Eng.},
document_type = {Article},
source = {Scopus}
}
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Oscillatory motions with large amplitudes can induce nonlinear wave propagation effects resulting in harmonics that evolve over space. In order to understand these effects, knowledge of the motions of applied mechanical motion is needed to rule out the presence of harmonic motion arising from the mechanical source. We propose a simple technique to measure the spectral content of mechanical excitation based on the use of a set of detection coils mounted on the elastography excitation system. The motion of these coils causes a small signal to be induced from the applied static magnetic field of the MRI system. A detailed analysis shows that quantitative assessment of excitations is possible with correct geometrical arrangement of the detector coils. However, it shows that nonlinear effects can also occur depending on the alignment of the detection coils with respect to Bo. The system is easy to operate and allows for the time resolved observation of the actuator motion for each experimental setup. The system is intended to be used before and after MRE experiments to determine excitation spectral content and repeatability. We demonstrate its use in a one-dimensional elastography experiment and show that this information is an essential prerequisite for studying material nonlinear elastic properties using MRE. © 2004 Wiley Periodicals, Inc. -->\n<!-- </div> -->\n<!-- -->\n\n</div>\n","downloads":0,"abbrev_source_title":"Concepts Magn. Reson. Part B: Magn Reson. Eng.","abstract":"Harmonic MR elastography (MRE) monitors the propagation of acoustic waves in tissues in the audio regime. Oscillatory motions with large amplitudes can induce nonlinear wave propagation effects resulting in harmonics that evolve over space. In order to understand these effects, knowledge of the motions of applied mechanical motion is needed to rule out the presence of harmonic motion arising from the mechanical source. We propose a simple technique to measure the spectral content of mechanical excitation based on the use of a set of detection coils mounted on the elastography excitation system. The motion of these coils causes a small signal to be induced from the applied static magnetic field of the MRI system. A detailed analysis shows that quantitative assessment of excitations is possible with correct geometrical arrangement of the detector coils. However, it shows that nonlinear effects can also occur depending on the alignment of the detection coils with respect to Bo. The system is easy to operate and allows for the time resolved observation of the actuator motion for each experimental setup. The system is intended to be used before and after MRE experiments to determine excitation spectral content and repeatability. We demonstrate its use in a one-dimensional elastography experiment and show that this information is an essential prerequisite for studying material nonlinear elastic properties using MRE. © 2004 Wiley Periodicals, Inc.","affiliation":"Imaging Research, Sunnybrook Women's Coll. Hlth. S., University of Toronto, Toronto, Ont., Canada; Department of Medical Imaging, Hospital for Sick Children, University of Toronto, Toronto, Ont., Canada; Department of Medical Informatics, Univ. Hospital Benjamin Franklin, Free University Berlin, Berlin, Germany","author":["Plewes, D.B.a","Luginbuhl, C.a","Macgowan, C.b","Sack, I.c"],"author_keywords":"Elastography; Elastography instrumentation; Nonlinear acoustics; Wave propagation","author_short":["Plewes, D‥","Luginbuhl, C.","Macgowan, C.","Sack, I."],"bibtex":"@article{ Plewes200432,\n author = {Plewes, D.B.a and Luginbuhl, C.a and Macgowan, C.b and Sack, I.c },\n title = {An inductive method to measure mechanical excitation spectra for MRI elastography},\n journal = {Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering},\n year = {2004},\n volume = {21},\n number = {1},\n pages = {32-39},\n note = {cited By (since 1996)1},\n url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-4744371690&partnerID=40&md5=49c28e19952849439c59647f98abb7af},\n affiliation = {Imaging Research, Sunnybrook Women's Coll. Hlth. S., University of Toronto, Toronto, Ont., Canada; Department of Medical Imaging, Hospital for Sick Children, University of Toronto, Toronto, Ont., Canada; Department of Medical Informatics, Univ. Hospital Benjamin Franklin, Free University Berlin, Berlin, Germany},\n abstract = {Harmonic MR elastography (MRE) monitors the propagation of acoustic waves in tissues in the audio regime. Oscillatory motions with large amplitudes can induce nonlinear wave propagation effects resulting in harmonics that evolve over space. In order to understand these effects, knowledge of the motions of applied mechanical motion is needed to rule out the presence of harmonic motion arising from the mechanical source. We propose a simple technique to measure the spectral content of mechanical excitation based on the use of a set of detection coils mounted on the elastography excitation system. The motion of these coils causes a small signal to be induced from the applied static magnetic field of the MRI system. A detailed analysis shows that quantitative assessment of excitations is possible with correct geometrical arrangement of the detector coils. However, it shows that nonlinear effects can also occur depending on the alignment of the detection coils with respect to Bo. The system is easy to operate and allows for the time resolved observation of the actuator motion for each experimental setup. The system is intended to be used before and after MRE experiments to determine excitation spectral content and repeatability. We demonstrate its use in a one-dimensional elastography experiment and show that this information is an essential prerequisite for studying material nonlinear elastic properties using MRE. © 2004 Wiley Periodicals, Inc.},\n author_keywords = {Elastography; Elastography instrumentation; Nonlinear acoustics; Wave propagation},\n keywords = {article; device; elasticity; elastography; geometry; magnetic field; nuclear magnetic resonance imaging; quantitative analysis; technique},\n references = {Plewes, D.B., Betty, I., Urchuk, S., Soutar, I., Visualizing tissue compliance with MR (1995) J Magn Reson Imag, 5 (6), pp. 733-738; Muthupillai, R., Lomas, D., Rossman, P., Greenleaf, J., Manduca, A., Ehman, R., MR imaging of acoustic strain waves: Initial in-vivo results (1995) Science, 269, pp. 1854-1857; Bishop, J., Poole, G., Leitch, M., Plewes, D.B., Magnetic resonance imaging of shear wave propagation in excised tissue (1998) J Magn Reson Imag, 8, pp. 1257-1265; Ehman, R.L., Muthupillai, R., Lomas, D.J., Rossman, P.J., Greenleaf, J.F., Manduca, A., Riederer, S.J., Magnetoelastography: MRI of acoustic strain waves (1995) Radiology, 179, p. 335; Lewa, C.J., De Certaines, J.D., MR imaging of viscoelastic properties (1995) J Magn Reson Imag, 5, pp. 242-244; Walker, C.L., Foster, F.S., Plewes, D.B., Magnetic resonance imaging of ultrasonic fields (1998) Ultrasound Med Biol, 24, pp. 137-142; Plewes, D.B., Silver, S., Starkoski, B., Walker, C.L., MRI of ultrasound fields: Gradient characteristics (2000) J Magn Reson Imag, 11 (4), pp. 452-457; Sinkus, R., Weiss, S., Eigger, E., Lorenzen, J., Dargatz, M., Kuhl, C., Non-linear elastic tissue properties of the breast measure by MR-elastography: Initial in-vitro and in-vivo results (2002) Tenth Scientific Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine, , May 18-24, 2002, Honolulu, HI, paper 33; Catheline, S., Gennisson, J., Chaffaï, S., Fink, M., Measuring non-linear elastic parameters of soft tissues using transient elastography (2002) First International Conference on the Ultrasonic Measurement and Imaging of Tissue Elasticity, , October 20-23, 2002, Niagara Falls, Canada; Muthupillai, R., Rossman, P.J., Lomas, D.J., Greenleaf, J.F., Riederer, S.J., Ehman, R.L., Magnetic resonance imaging of transverse acoustic strain waves (1996) Magn Reson Med, 36, pp. 266-274; Uffmann, K., Abicht, C., Quick, H.H., Ulbricht, H., Ladd, M.E., Characterization of an electromagnetic actuator for MR elastography (2001) Proc Intl Soc Magn Reson Med, 9, p. 1636; Model 3B-ST, , Bryston Limited, Peterbourgh, Canada; Hardy, C.J., Cline, H.E., Broadband nuclear magnetic resonance pulses with two-dimensional spatial selectivity (1989) J Appl Phys, 66, pp. 1513-1516; Morse, P.M., Ingard, K.U., (1986) Theoretical Acoustics, p. 874. , Princeton University Press},\n correspondence_address1 = {Plewes, D.B.; Imaging Research, Sunnybrook Women's Coll. Hlth. S., University of Toronto, Toronto, Ont., Canada; email: don.plewes@sw.ca},\n issn = {10437347},\n doi = {10.1002/cmr.b.20011},\n language = {English},\n abbrev_source_title = {Concepts Magn. Reson. Part B: Magn Reson. Eng.},\n document_type = {Article},\n source = {Scopus}\n}","bibtype":"article","correspondence_address1":"Plewes, D.B.; Imaging Research, Sunnybrook Women's Coll. Hlth. 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