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  Patient-specific RF safety assessment in MRI: Progress in creating surface-based human head and shoulder models

Kozlov, M., Kalloch, B., Horner, M., Bazin, P.-L., Weiskopf, N., & Möller, H. E. (2019). Patient-specific RF safety assessment in MRI: Progress in creating surface-based human head and shoulder models. In Brain and human body modeling: Computational human modeling at EMBC 2018 (pp. 245-282). Cham: Springer. doi:10.1007/978-3-030-21293-3_13.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-BC7F-B Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BC80-7
Genre: Book Chapter

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 Creators:
Kozlov, Mikhail1, Author              
Kalloch, Benjamin2, 3, Author              
Horner, Marc4, Author
Bazin, Pierre-Louis1, 2, 5, Author              
Weiskopf, Nikolaus1, Author              
Möller, Harald E.6, Author              
Affiliations:
1Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2205649              
2Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
3Leipzig University of Applied Sciences, Germany, ou_persistent22              
4ANSYS, Inc., Evanston, IL, ou_persistent22              
5University of Amsterdam, the Netherlands, ou_persistent22              
6Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634558              

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Free keywords: Biomedical imaging; Computational electromagnetics; Antenna arrays; RF safety
 Abstract: The interaction of electromagnetic (EM) fields with the human body during magnetic resonance imaging (MRI) is complex and subject specific. MRI radiofrequency (RF) coil performance and safety assessment typically includes numerical EM simulations with a set of human body models. The dimensions of mesh elements used for discretization of the EM simulation domain must be adequate for correct representation of the MRI coil elements, different types of human tissue, and wires and electrodes of additional devices. Examples of such devices include those used during electroencephalography, transcranial magnetic stimulation, and transcranial direct current stimulation, which record complementary information or manipulate brain states during MRI measurement. The electrical contact within and between tissues, as well as between an electrode and the skin, must also be preserved. These requirements can be fulfilled with anatomically correct surface-based human models and EM solvers based on unstructured meshes. Here, we report (i) our workflow used to generate the surface meshes of a head and torso model from the segmented AustinMan dataset, (ii) head and torso model mesh optimization for three-dimensional EM simulation in ANSYS HFSS, and (iii) several case studies of MRI RF coil performance and safety assessment.

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Language(s): eng - English
 Dates: 2019-08-29
 Publication Status: Published online
 Pages: -
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 Identifiers: DOI: 10.1007/978-3-030-21293-3_13
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Title: Brain and human body modeling: Computational human modeling at EMBC 2018
Source Genre: Book
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Publ. Info: Cham : Springer
Pages: XI, 402 pp. Volume / Issue: - Sequence Number: - Start / End Page: 245 - 282 Identifier: DOI: 10.1007/978-3-030-21293-3
ISBN: 978-3-030-21292-6