Arrangement for operating a symmetrical radio-frequency antenna in a nuclear magnetic resonance tomography apparatus
First Claim
1. In a nuclear magnetic resonance tomography apparatus having a symmetrical radio-frequency antenna and an asymmetrical line for carrying signals to and from said antenna, the improvement of a sheath wave trap connected between said antenna and said line, said sheath wave trap comprising an inductor in the shape of a toroid.
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Abstract
For operating the radio-frequency antenna of a nuclear magnetic resonance tomography apparatus, the antenna being connected to an asymmetrical line, a sheath wave trap is provided between the antenna and the line, with the inductor of the sheath wave trap being a toroid. A low-scatter sheath wave trap is obtained in this manner, particularly suitable for circularly polarized resonators. The trap suppresses difference currents caused by asymmetries, and thus simultaneously functions as a balanced-to-unbalanced transformer (balun).
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Citations
5 Claims
- 1. In a nuclear magnetic resonance tomography apparatus having a symmetrical radio-frequency antenna and an asymmetrical line for carrying signals to and from said antenna, the improvement of a sheath wave trap connected between said antenna and said line, said sheath wave trap comprising an inductor in the shape of a toroid.
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