RF coil for use in an MR imaging system
First Claim
Patent Images
1. An RF coil for an MR imaging system comprising:
- a metamaterial which transmits RF excitation signals and/or receives MR relaxation signals and operates in the RF/MR frequency band like a magnetic conductor or a magnetic wall, the metamaterial being a resonant periodic structure including one or more of wires and metal patches positioned on a metallic ground plane.
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Abstract
An RF coil is proposed for use as an RF antenna for a MR imaging system, for transmitting RF excitation signals and for receiving MR relaxation signals. The RF coil of the invention includes an array of patches (1) which are capacitively coupled with each other. The array of patches forms a resonant surface on which surface currents can be resonantly excited for generating at least one field modus.
34 Citations
19 Claims
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1. An RF coil for an MR imaging system comprising:
a metamaterial which transmits RF excitation signals and/or receives MR relaxation signals and operates in the RF/MR frequency band like a magnetic conductor or a magnetic wall, the metamaterial being a resonant periodic structure including one or more of wires and metal patches positioned on a metallic ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An RF coil for an MR imaging system comprising:
a material on a metallic ground plane which transmits RF excitation signals and/or receives MR relaxation signals in an RF/MR frequency band, the material including an array of metallic patches capacitively coupled with each other, to form a resonant surface on which surface currents can be resonantly excited and generate at least one field modus, and which operates as a tuned resonant structure in the RF/MR frequency band like a magnetic conductor or a magnetic wall. - View Dependent Claims (10, 11, 12, 13)
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14. An RF coil for a magnetic resonance imaging system, the RF coil comprising:
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an array of metallic plates tuned to an RF/MR frequency band of the magnetic resonance imaging system; a strip line running diagonally across the array of patches to excite the array of patches to transmit RF signals in the RF/MR frequency band.
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- 15. An RF coil for an MR imaging system, for transmitting RF excitation signals and/or for receiving MR relaxation signals, in combination with or comprising a metamaterial which operates in the RF/MR frequency band like a magnetic conductor or a magnetic wall, which is tuned by selecting the sizes of the patches and/or the values of the coupling capacitors for exciting three orthogonal fundamental field modes at substantially the same resonant frequency.
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17. An RF coil for a magnetic resonance (MR) system comprising:
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a metamaterial structure which transmits RF excitation signals and/or MR relaxation signals substantially at a resonance frequency; a tuning system which tunes the metamaterial structure to excite three orthogonal fundamental field modes substantially at the resonance frequency. - View Dependent Claims (18, 19)
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Specification