Theoretical model for an MRI radio frequency resonator

Brian A. Baertlein; Özlem Özbay; Tamer Ibrahim; Robert Lee; Ying Yu; Allahyar Kangarlu; Pierre Marie L. Robitaille

doi:10.1109/10.828153

Theoretical model for an MRI radio frequency resonator

Brian A. Baertlein
, Özlem Özbay
, Tamer Ibrahim
, Robert Lee
, Ying Yu
, Allahyar Kangarlu
, Pierre Marie L. Robitaille

Radiology

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

A theoretical model is described for a magnetic resonance imaging (MRI) radio-frequency resonator (an MRI 'coil') that is useful at ultrahigh frequencies. The device is a 'TEM resonator,' which is based on a concept originally proposed by Roschmann (1988). The coil comprises a circular cavity-like structure containing several coaxial transmission-lines operating in a transverse electromagnetic (TEM) mode. The model developed herein treats the empty coil and is based on multiconductor transmission line theory. This work generalizes and extends similiar analyses of the device by Roschmann (1995) and Chingas and Zhang (1996). The model employs explicit calculation of per-unit-length parameters for TEM lines having arbitrary geometries. Calculations of the resonator's frequency response are found to compare well with measurements. Fields produced by linear (single-point) and quadrature drive are also computed and compared to images of low-permittivity phantoms.

Original language	English
Pages (from-to)	535-546
Number of pages	12
Journal	IEEE Transactions on Biomedical Engineering
Volume	47
Issue number	4
DOIs	https://doi.org/10.1109/10.828153
State	Published - 2000

Keywords

Magnetic resonance imaging (MRI)
Radio frequency (RF) resonator

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10.1109/10.828153

Cite this

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title = "Theoretical model for an MRI radio frequency resonator",

abstract = "A theoretical model is described for a magnetic resonance imaging (MRI) radio-frequency resonator (an MRI 'coil') that is useful at ultrahigh frequencies. The device is a 'TEM resonator,' which is based on a concept originally proposed by Roschmann (1988). The coil comprises a circular cavity-like structure containing several coaxial transmission-lines operating in a transverse electromagnetic (TEM) mode. The model developed herein treats the empty coil and is based on multiconductor transmission line theory. This work generalizes and extends similiar analyses of the device by Roschmann (1995) and Chingas and Zhang (1996). The model employs explicit calculation of per-unit-length parameters for TEM lines having arbitrary geometries. Calculations of the resonator's frequency response are found to compare well with measurements. Fields produced by linear (single-point) and quadrature drive are also computed and compared to images of low-permittivity phantoms.",

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year = "2000",

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AU - Baertlein, Brian A.

AU - Özbay, Özlem

AU - Ibrahim, Tamer

AU - Lee, Robert

AU - Yu, Ying

AU - Kangarlu, Allahyar

AU - Robitaille, Pierre Marie L.

PY - 2000

Y1 - 2000

N2 - A theoretical model is described for a magnetic resonance imaging (MRI) radio-frequency resonator (an MRI 'coil') that is useful at ultrahigh frequencies. The device is a 'TEM resonator,' which is based on a concept originally proposed by Roschmann (1988). The coil comprises a circular cavity-like structure containing several coaxial transmission-lines operating in a transverse electromagnetic (TEM) mode. The model developed herein treats the empty coil and is based on multiconductor transmission line theory. This work generalizes and extends similiar analyses of the device by Roschmann (1995) and Chingas and Zhang (1996). The model employs explicit calculation of per-unit-length parameters for TEM lines having arbitrary geometries. Calculations of the resonator's frequency response are found to compare well with measurements. Fields produced by linear (single-point) and quadrature drive are also computed and compared to images of low-permittivity phantoms.

AB - A theoretical model is described for a magnetic resonance imaging (MRI) radio-frequency resonator (an MRI 'coil') that is useful at ultrahigh frequencies. The device is a 'TEM resonator,' which is based on a concept originally proposed by Roschmann (1988). The coil comprises a circular cavity-like structure containing several coaxial transmission-lines operating in a transverse electromagnetic (TEM) mode. The model developed herein treats the empty coil and is based on multiconductor transmission line theory. This work generalizes and extends similiar analyses of the device by Roschmann (1995) and Chingas and Zhang (1996). The model employs explicit calculation of per-unit-length parameters for TEM lines having arbitrary geometries. Calculations of the resonator's frequency response are found to compare well with measurements. Fields produced by linear (single-point) and quadrature drive are also computed and compared to images of low-permittivity phantoms.

KW - Magnetic resonance imaging (MRI)

KW - Radio frequency (RF) resonator

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DO - 10.1109/10.828153

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SP - 535

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JO - IEEE Transactions on Biomedical Engineering

JF - IEEE Transactions on Biomedical Engineering

IS - 4

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Theoretical model for an MRI radio frequency resonator

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Keywords

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