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The magnetic force generation in magnetomotive ultrasound imaging

Kranemann, Tim C. ; Evertsson, Maria LU and Schmitz, Georg (2020) 2020 IEEE International Ultrasonics Symposium, IUS 2020 In IEEE International Ultrasonics Symposium, IUS 2020-September.
Abstract

In magnetomotive ultrasound imaging, the tissue displacement due to a magnetic force on embedded magnetic nanoparticles is measured. It was previously shown that the nanoparticle contrast agent exhibits a non-linear magnetization characteristic, which is also reflected in the magnetomotive force. However, this non-linearity was rarely taken into account for the application. Here, the implications of the assumption of a linear and a nonlinear static magnetization characteristic were contrasted by analytic calculations. The calculations were restricted to the typical scenario of an excitation with a magnetic field generator fed with a single current consisting of only a sinusoidal and a DC component. Due to this waveform of the excitation... (More)

In magnetomotive ultrasound imaging, the tissue displacement due to a magnetic force on embedded magnetic nanoparticles is measured. It was previously shown that the nanoparticle contrast agent exhibits a non-linear magnetization characteristic, which is also reflected in the magnetomotive force. However, this non-linearity was rarely taken into account for the application. Here, the implications of the assumption of a linear and a nonlinear static magnetization characteristic were contrasted by analytic calculations. The calculations were restricted to the typical scenario of an excitation with a magnetic field generator fed with a single current consisting of only a sinusoidal and a DC component. Due to this waveform of the excitation current, the description of the force was carried out with the coefficients of a Fourier series. It was evident that nonlinear saturation of the particles is the preferred operating point for the application, as forces relative to particle concentration are maximized. Further, the excitation current can be chosen with or without a DC component to excite a force of approximately the same magnitude at the single or double frequency of the excitation current. The calculations thus contribute to the profound understanding of the magnetomotive force. The calculations can further be used to match magnetic fields and nanoparticles. Future work is expected to include the dynamic magnetization properties of the contrast agent.

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Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Magnetic Forces, Magnetization Characteristic, Magnetomotive Ultrasound Imaging, Nanoparticles
host publication
IUS 2020 - International Ultrasonics Symposium, Proceedings
series title
IEEE International Ultrasonics Symposium, IUS
volume
2020-September
article number
9251682
publisher
IEEE Computer Society
conference name
2020 IEEE International Ultrasonics Symposium, IUS 2020
conference location
Las Vegas, United States
conference dates
2020-09-07 - 2020-09-11
external identifiers
  • scopus:85097902705
ISSN
1948-5727
1948-5719
ISBN
9781728154480
DOI
10.1109/IUS46767.2020.9251682
language
English
LU publication?
yes
id
2f7a373c-46ce-4cf3-aa06-6097b349d482
date added to LUP
2021-01-08 09:53:55
date last changed
2024-05-16 00:58:47
@inproceedings{2f7a373c-46ce-4cf3-aa06-6097b349d482,
  abstract     = {{<p>In magnetomotive ultrasound imaging, the tissue displacement due to a magnetic force on embedded magnetic nanoparticles is measured. It was previously shown that the nanoparticle contrast agent exhibits a non-linear magnetization characteristic, which is also reflected in the magnetomotive force. However, this non-linearity was rarely taken into account for the application. Here, the implications of the assumption of a linear and a nonlinear static magnetization characteristic were contrasted by analytic calculations. The calculations were restricted to the typical scenario of an excitation with a magnetic field generator fed with a single current consisting of only a sinusoidal and a DC component. Due to this waveform of the excitation current, the description of the force was carried out with the coefficients of a Fourier series. It was evident that nonlinear saturation of the particles is the preferred operating point for the application, as forces relative to particle concentration are maximized. Further, the excitation current can be chosen with or without a DC component to excite a force of approximately the same magnitude at the single or double frequency of the excitation current. The calculations thus contribute to the profound understanding of the magnetomotive force. The calculations can further be used to match magnetic fields and nanoparticles. Future work is expected to include the dynamic magnetization properties of the contrast agent.</p>}},
  author       = {{Kranemann, Tim C. and Evertsson, Maria and Schmitz, Georg}},
  booktitle    = {{IUS 2020 - International Ultrasonics Symposium, Proceedings}},
  isbn         = {{9781728154480}},
  issn         = {{1948-5727}},
  keywords     = {{Magnetic Forces; Magnetization Characteristic; Magnetomotive Ultrasound Imaging; Nanoparticles}},
  language     = {{eng}},
  publisher    = {{IEEE Computer Society}},
  series       = {{IEEE International Ultrasonics Symposium, IUS}},
  title        = {{The magnetic force generation in magnetomotive ultrasound imaging}},
  url          = {{http://dx.doi.org/10.1109/IUS46767.2020.9251682}},
  doi          = {{10.1109/IUS46767.2020.9251682}},
  volume       = {{2020-September}},
  year         = {{2020}},
}