Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
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TY - GEN
T1 - A compact and efficient multi-mode antenna for parallel transmission of 7T magnetic resonance imaging
AU - Pitman, Sam
AU - Hu, Julia
PY - 2013/11
Y1 - 2013/11
N2 - Abstract—with the reduced radio frequency wavelength at Ultrahigh field magnetic resonance imaging (MRI) scanner, traditional volume-type RF hardware suffers from the standing wave effect and leads to RF artefacts, e.g. inhomogeneity in themagnetic field, and signal losses of MR images. Travelling wave excitation is proposed recently to utilize the waveguide effect of the magnet bore to achieve a homogeneous magnetic field (B1 field) distribution in large-size samples. However the current single patch antenna does not generate diverse B1 field patterns and therefore could not be utilize the latest parallel transmission (pTX) technology to accelerate imaging acquisition. In this work, a compact and efficient multi-mode antenna design is proposed to exploit the pTX technology. There are several advantages of the new design over the initially proposed dielectrically loadedwaveguide: First, the high efficiency and directivity of the new design is able to achieve more power efficient B1 field. Second, the multi-mode nature of the new design allows diverse B1 field generation. Third, the compact nature of this design will provide more room and reduce claustrophobia for subjects being imaged.
AB - Abstract—with the reduced radio frequency wavelength at Ultrahigh field magnetic resonance imaging (MRI) scanner, traditional volume-type RF hardware suffers from the standing wave effect and leads to RF artefacts, e.g. inhomogeneity in themagnetic field, and signal losses of MR images. Travelling wave excitation is proposed recently to utilize the waveguide effect of the magnet bore to achieve a homogeneous magnetic field (B1 field) distribution in large-size samples. However the current single patch antenna does not generate diverse B1 field patterns and therefore could not be utilize the latest parallel transmission (pTX) technology to accelerate imaging acquisition. In this work, a compact and efficient multi-mode antenna design is proposed to exploit the pTX technology. There are several advantages of the new design over the initially proposed dielectrically loadedwaveguide: First, the high efficiency and directivity of the new design is able to achieve more power efficient B1 field. Second, the multi-mode nature of the new design allows diverse B1 field generation. Third, the compact nature of this design will provide more room and reduce claustrophobia for subjects being imaged.
KW - Parallel Transmission
KW - Ultrahigh field MRI
KW - Multi-mode Antenna
U2 - 10.1109/LAPC.2013.6711957
DO - 10.1109/LAPC.2013.6711957
M3 - Conference contribution/Paper
SP - 534
EP - 538
BT - 2013 Loughborough Antennas & Propagation Conference
PB - IEEE
CY - Loughborough, UK
ER -