Abstract
Moving to the ultrahigh field magnetic resonance imaging (UHF MRI) brought many benefits such as potentially higher signal-to-noise ratio, contrast-to-noise ratio, and improved spectral resolution. The UHF MRI regime also introduced some challenges which could prevent full exploitation of mentioned advantages. A higher static magnetic field means increase in Larmor frequency, which further implies the shorter wavelength in a tissue. The shorter wavelength causes interferences of the RF signal and inhomogeneous excitation, which can be partially resolved by the introduction of the multichannel coil arrays. The biggest problem in UHF multichannel densely populated arrays is the existence of the interelement coupling, which should be minimized as much as possible. This article presents the nonconventional, recently developed decoupling techniques used in UHF MRI.
Highlights
Moving to the ultrahigh field regime brought many benefits such as increased signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and spectral resolution [1,2,3,4,5,6,7,8]
Those elements are flexible—the coils can be bent, elongated (Figure 1A,C), and overlapped while maintaining the high interelement decoupling without compromising the performance of the coil
The position of the electromagnetic bandgap (EBG) structure was optimized for the best decoupling between the two elements
Summary
Electrical Engineering Department, Technical University of Eindhoven, Eindhoven, Netherlands. Moving to the ultrahigh field magnetic resonance imaging (UHF MRI) brought many benefits such as potentially higher signal-to-noise ratio, contrast-to-noise ratio, and improved spectral resolution. The UHF MRI regime introduced some challenges which could prevent full exploitation of mentioned advantages. A higher static magnetic field means increase in Larmor frequency, which further implies the shorter wavelength in a tissue. The shorter wavelength causes interferences of the RF signal and inhomogeneous excitation, which can be partially resolved by the introduction of the multichannel coil arrays. The biggest problem in UHF multichannel densely populated arrays is the existence of the interelement coupling, which should be minimized as much as possible. This article presents the nonconventional, recently developed decoupling techniques used in UHF MRI. Specialty section: This article was submitted to Medical Physics and Imaging, a section of the journal Frontiers in Physics
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