Siemens Aktiengesellschaft

Yutaka Watanabe

Wilhelm Duerr

Juergen Hagen

Norihiko Mikoshiba

A circularly polarizing local antenna for use in a magnetic resonance apparatus is formed by first and second antennae, which are in turn respectively formed by first and second coils. The second coil has an opening surrounding an examination region, through which an examination subject can be introduced. The arrangement includes a coil holder, to which the first coil is attached so as to be movable between first and second positions and to which the second coil is rigidly attached. When the first coil is oriented in the first position, it also surrounds the examination region, with the respective coil axes of the first and second coils being disposed substantially perpendicular to each other. In the first position, the first coil obstructs the opening of the second coil. By moving the first coil from the first position to the second position, the first coil becomes oriented so as to leave the opening of the second coil unobstructed, permitting unimpeded introduction of the examination subject into the examination region.

Circularly polarizing local antenna arrangement with a movable antenna

An antenna arrangement for a nuclear magnetic resonance apparatus, the apparatus having a magnet which generates a basic magnetic field between two pole plates, includes a sub-antenna disposed at each pole plate, each sub-antenna being composed of a closed, grounded shielding facing toward the pole plate and a planar conductor structure disposed a distance from the shielding and substantially parallel thereto, into which a high-frequency current is fed.

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Erlangen, Germany

Yutaka Watanabe