Abstract #0140

32-Channel Combined Surface Loop / “Vertical” Loop Tight-Fit Array Provides for Full-Brain Coverage, High Transmit Performance, and SNR Improvement at 9.4T: an Alternative to Surface Loop / Dipole Antenna Combination.

Nikolai Avdievich^1,2, Ioannis Angelos Giapitzakis², and Anke Henning^1,2

¹Institute of Physics, Ernst-Moritz-Arndt University Greifswald, Greifswald, Germany, ²High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany

Tight-fit human head ultra-high field (UHF,>7T) transceiver (TxRx) surface loop phased arrays improve transmit (Tx)-efficiency in comparison to Tx-only arrays, which are larger to fit receive (Rx)-only arrays inside. A drawback of the TxRx-design is that the number of array elements is restricted by the number of available RF Tx-channels (commonly <16), which limits the Rx-performance. A new 32-element tight-fit human head array, which consists of 18 TxRx-loops and 14 Rx-only vertical loops, was constructed. The array provides for full-brain coverage, ~50% greater B₁⁺, and ~30% greater SNR near the brain center as compared to common Tx-only/ Rx-only (ToRo) array.

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