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Using a modified 3D-printer for mapping the magnetic field of RF coils designed for fetal and neonatal imaging

Vavoulas, Alexander; Vaiopoulos, Nicholas; Hedström, Erik LU ; Xanthis, Christos G. LU ; Sandalidis, Harilaos G. and Aletras, Anthony H. LU (2016) In Journal of Magnetic Resonance 269. p.146-151
Abstract

An experimental setup for characterizing the magnetic field of MRI RF coils was proposed and tested. The setup consisted of a specially configured 3D-printer, a network analyzer and a mid-performance desktop PC. The setup was tested on a single loop RF coil, part of a phased array for fetal imaging. Then, the setup was used for determining the magnetic field characteristics of a high-pass birdcage coil used for neonatal MR imaging with a vertical static field. The scattering parameter S21, converted into power ratio, was used for mapping the B1 magnetic field. The experimental measurements from the loop coil were close to the theoretical results (R = 0.924). A high degree of homogeneity was measured for the neonatal birdcage... (More)

An experimental setup for characterizing the magnetic field of MRI RF coils was proposed and tested. The setup consisted of a specially configured 3D-printer, a network analyzer and a mid-performance desktop PC. The setup was tested on a single loop RF coil, part of a phased array for fetal imaging. Then, the setup was used for determining the magnetic field characteristics of a high-pass birdcage coil used for neonatal MR imaging with a vertical static field. The scattering parameter S21, converted into power ratio, was used for mapping the B1 magnetic field. The experimental measurements from the loop coil were close to the theoretical results (R = 0.924). A high degree of homogeneity was measured for the neonatal birdcage RF coil. The development of MR RF coils is time consuming and resource intensive. The proposed experimental setup provides an alternative method for magnetic field characterization of RF coils used in MRI.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Helmholtz condition, Helmholtz pair, MRI, RF coil design, Volume coil
in
Journal of Magnetic Resonance
volume
269
pages
6 pages
publisher
Elsevier
external identifiers
  • scopus:84974704955
  • wos:000381239900017
ISSN
1090-7807
DOI
10.1016/j.jmr.2016.06.005
language
English
LU publication?
yes
id
a1f0fdd2-1b7f-4d03-8b5b-8d6561242246
date added to LUP
2016-12-14 11:15:06
date last changed
2017-11-05 05:11:09
@article{a1f0fdd2-1b7f-4d03-8b5b-8d6561242246,
  abstract     = {<p>An experimental setup for characterizing the magnetic field of MRI RF coils was proposed and tested. The setup consisted of a specially configured 3D-printer, a network analyzer and a mid-performance desktop PC. The setup was tested on a single loop RF coil, part of a phased array for fetal imaging. Then, the setup was used for determining the magnetic field characteristics of a high-pass birdcage coil used for neonatal MR imaging with a vertical static field. The scattering parameter S21, converted into power ratio, was used for mapping the B<sub>1</sub> magnetic field. The experimental measurements from the loop coil were close to the theoretical results (R = 0.924). A high degree of homogeneity was measured for the neonatal birdcage RF coil. The development of MR RF coils is time consuming and resource intensive. The proposed experimental setup provides an alternative method for magnetic field characterization of RF coils used in MRI.</p>},
  author       = {Vavoulas, Alexander and Vaiopoulos, Nicholas and Hedström, Erik and Xanthis, Christos G. and Sandalidis, Harilaos G. and Aletras, Anthony H.},
  issn         = {1090-7807},
  keyword      = {Helmholtz condition,Helmholtz pair,MRI,RF coil design,Volume coil},
  language     = {eng},
  month        = {08},
  pages        = {146--151},
  publisher    = {Elsevier},
  series       = {Journal of Magnetic Resonance},
  title        = {Using a modified 3D-printer for mapping the magnetic field of RF coils designed for fetal and neonatal imaging},
  url          = {http://dx.doi.org/10.1016/j.jmr.2016.06.005},
  volume       = {269},
  year         = {2016},
}