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Abstract #4995

Towards Optimization of SNR at Both Frequencies of an UHF Double-Tuned Array: 7T 32-Element Transceiver 31P/1H Loop/Dipole Human Head Array.

Nikolai I. Avdievich1, Georgiy A. Solomakha1, Felix Glang1, Tanja Platt2, Stephan Orzada2, Dario Bosch1, Mark E. Ladd2, Andreas Korzowski 2, and Klaus Scheffler1,3
1High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, 2Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ) Heidelberg, Heidelberg, Germany, 3Department for Biomedical Magnetic Resonance, University of Tübingen, Tübingen, Germany

Synopsis

Keywords: High-Field MRI, Spectroscopy, Double-tuned array, Dipole antenna, transceiver array, dipole/loop combination

Motivation: Placing transceiver(TxRx) X and 1H arrays into one layer closer to the sample preserves performance of a double-tuned(DT) RF array at both frequencies. Further SNR improvement requires more Rx elements(e.g.32), which is difficult to realize using loops.

Goal(s): To verify feasibility of a densely-populated human head UHF 32-element DT array.

Approach: At UHF, the array can be greatly simplified by using 1H dipoles. We developed a novel UHF loop/dipole DT array with 32 TxRx elements all placed in one layer.

Results: We demonstrated feasibility of developing a tight-fitting densely-populated 32-element human head UHF DT array. First results showed reasonable performance at both frequencies.

Impact: We demonstrated the feasibility of constructing and decoupling of a densely-populated 32-element double-tuned transceiver 7T human head array. First results show reasonable transmit and receive performance at both frequencies. The developed design can be even more beneficial at higher fields.

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