MR coil assembly with multiple dipole antennas and connection elements with blocking circuits

A coil arrangement (1) for use as a transmitter and/or reception coil in an MR system, the coil arrangement (1) comprising a dipole antenna arrangement (2) with a plurality of dipole antennas (2a-d) connected to one another via connecting elements (3a-h), the connecting elements (3a-h) being designed to be transferred from an electrically connecting state to an electrically disconnecting state, and vice versa, and the arrangement configured so that the dipole antennas (2a-d) in the electrically connecting state of the connecting elements (3a-h) form at least a part of a volume coil and/or a conductor loop arrangement of the coil arrangement (1) comprising conductor loops (20a-c),

• wherein the connecting elements (3a-h) comprise connecting element blocking circuits (4a-h), which automatically block when a high-frequency AC voltage having a frequency corresponding to the blocking frequency of the connecting element blocking circuits (4a-h) is applied to the coil arrangement (1),
• wherein the coil arrangement (1) is configured so that the dipole antennas (2a-d) radiate and/or receive a high-frequency electromagnetic alternating field with a first frequency being the blocking frequency, when the connecting elements (3a-h) are in the electrically disconnecting state,
• wherein the volume coil resulting in the electrically connecting state of the connecting elements (3a-h) and/or each of the conductor loops (20a-c) of the conductor loop arrangement resulting in the electrically connecting state of the connecting elements (3a-h) radiates and/or receives a high-frequency, electromagnetic alternating field with a second frequency different from the first frequency, and
• wherein the first frequency is a 1H-core resonant frequency and the second frequency is an X-core resonant frequency.