IEICE TRANSACTIONS on Communications
Magnetic Field Homogeneity of Birdcage Coil for 4T MRI System with No Lumped Circuit Elements
Summary :
In recent years, magnetic resonance imaging (MRI) systems that operate up to under 3T are being used in clinical practice in Japan. In order to achieve the requirements of higher image quality and shorter imaging times, devices that utilize high magnetic fields (> 3T) and high power electromagnetic (EM) wave pulses have been developed. The rise of the static magnetic field is proportional to the increase of the EM wave frequency which raises the issue of variation in capacitance used in the radio frequency (RF) coil for MRI system. In addition, increasing power causes problems of withstanding voltage and these approaches leads to generation of non-uniform magnetic field inside the RF coil. Therefore, we proposed a birdcage coil without the use of lumped circuit elements for MRI systems in previous study. However, it is difficult to fabricate this birdcage coil. Hence, simply-structured birdcage coil with no lumped circuit elements is desired. In this paper, we propose a simply-structured birdcage coil with no lumped circuit elements for a 4T MRI system. In addition, the authors investigated the input impedance and magnetic field distribution of the proposed coil by FDTD calculations and measurements. The results confirm that the proposed birdcage coil matches the performance of the conventional birdcage coil which includes several capacitors.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E97-B No.4 pp.791-797
- Publication Date
- 2014/04/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E97.B.791
- Type of Manuscript
- PAPER
- Category
- Antennas and Propagation
Authors
Ryotaro SUGA
Chiba University
Kazuyuki SAITO
Chiba University
Masaharu TAKAHASHI
Chiba University
Koichi ITO
Chiba University
Keyword
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Ryotaro SUGA, Kazuyuki SAITO, Masaharu TAKAHASHI, Koichi ITO, "Magnetic Field Homogeneity of Birdcage Coil for 4T MRI System with No Lumped Circuit Elements" in IEICE TRANSACTIONS on Communications,
vol. E97-B, no. 4, pp. 791-797, April 2014, doi: 10.1587/transcom.E97.B.791.
Abstract: In recent years, magnetic resonance imaging (MRI) systems that operate up to under 3T are being used in clinical practice in Japan. In order to achieve the requirements of higher image quality and shorter imaging times, devices that utilize high magnetic fields (> 3T) and high power electromagnetic (EM) wave pulses have been developed. The rise of the static magnetic field is proportional to the increase of the EM wave frequency which raises the issue of variation in capacitance used in the radio frequency (RF) coil for MRI system. In addition, increasing power causes problems of withstanding voltage and these approaches leads to generation of non-uniform magnetic field inside the RF coil. Therefore, we proposed a birdcage coil without the use of lumped circuit elements for MRI systems in previous study. However, it is difficult to fabricate this birdcage coil. Hence, simply-structured birdcage coil with no lumped circuit elements is desired. In this paper, we propose a simply-structured birdcage coil with no lumped circuit elements for a 4T MRI system. In addition, the authors investigated the input impedance and magnetic field distribution of the proposed coil by FDTD calculations and measurements. The results confirm that the proposed birdcage coil matches the performance of the conventional birdcage coil which includes several capacitors.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E97.B.791/_p
Copy
@ARTICLE{e97-b_4_791,
author={Ryotaro SUGA, Kazuyuki SAITO, Masaharu TAKAHASHI, Koichi ITO, },
journal={IEICE TRANSACTIONS on Communications},
title={Magnetic Field Homogeneity of Birdcage Coil for 4T MRI System with No Lumped Circuit Elements},
year={2014},
volume={E97-B},
number={4},
pages={791-797},
abstract={In recent years, magnetic resonance imaging (MRI) systems that operate up to under 3T are being used in clinical practice in Japan. In order to achieve the requirements of higher image quality and shorter imaging times, devices that utilize high magnetic fields (> 3T) and high power electromagnetic (EM) wave pulses have been developed. The rise of the static magnetic field is proportional to the increase of the EM wave frequency which raises the issue of variation in capacitance used in the radio frequency (RF) coil for MRI system. In addition, increasing power causes problems of withstanding voltage and these approaches leads to generation of non-uniform magnetic field inside the RF coil. Therefore, we proposed a birdcage coil without the use of lumped circuit elements for MRI systems in previous study. However, it is difficult to fabricate this birdcage coil. Hence, simply-structured birdcage coil with no lumped circuit elements is desired. In this paper, we propose a simply-structured birdcage coil with no lumped circuit elements for a 4T MRI system. In addition, the authors investigated the input impedance and magnetic field distribution of the proposed coil by FDTD calculations and measurements. The results confirm that the proposed birdcage coil matches the performance of the conventional birdcage coil which includes several capacitors.},
keywords={},
doi={10.1587/transcom.E97.B.791},
ISSN={1745-1345},
month={April},}
Copy
TY - JOUR
TI - Magnetic Field Homogeneity of Birdcage Coil for 4T MRI System with No Lumped Circuit Elements
T2 - IEICE TRANSACTIONS on Communications
SP - 791
EP - 797
AU - Ryotaro SUGA
AU - Kazuyuki SAITO
AU - Masaharu TAKAHASHI
AU - Koichi ITO
PY - 2014
DO - 10.1587/transcom.E97.B.791
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E97-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2014
AB - In recent years, magnetic resonance imaging (MRI) systems that operate up to under 3T are being used in clinical practice in Japan. In order to achieve the requirements of higher image quality and shorter imaging times, devices that utilize high magnetic fields (> 3T) and high power electromagnetic (EM) wave pulses have been developed. The rise of the static magnetic field is proportional to the increase of the EM wave frequency which raises the issue of variation in capacitance used in the radio frequency (RF) coil for MRI system. In addition, increasing power causes problems of withstanding voltage and these approaches leads to generation of non-uniform magnetic field inside the RF coil. Therefore, we proposed a birdcage coil without the use of lumped circuit elements for MRI systems in previous study. However, it is difficult to fabricate this birdcage coil. Hence, simply-structured birdcage coil with no lumped circuit elements is desired. In this paper, we propose a simply-structured birdcage coil with no lumped circuit elements for a 4T MRI system. In addition, the authors investigated the input impedance and magnetic field distribution of the proposed coil by FDTD calculations and measurements. The results confirm that the proposed birdcage coil matches the performance of the conventional birdcage coil which includes several capacitors.
ER -
English
