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Abstract #3512

Segmented Dipole: A Remotely Reconfigurable Near-Field Dipole Antenna Transmitter for Optimized 7 T Spine Imaging

Qi Duan1, Jeff H. Duyn1, and Hellmut Merkle1

1Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States

7T spine array based on electric dipole antenna starts to gain attention recently. Nevertheless, the transmit efficiency of the dipole has a natural decay from the feeding point, which does not necessarily corresponding to the target imaging area. In addition, a variety of patient size requires the dipole to be reconfigured for optimum performance. In this work, we propose a concept of “segmented dipole” that can be remotely reconfigured for transmit field-of-view shifting, tuning, and impedance matching characteristics without the need of a parallel-transmit system. A prototype transmitter was built and the reconfiguration capability was demonstrated at a 7T scanner.

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