Flexible transceiver array for ultrahigh field human MR imaging |
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Authors: | Wu Bing Zhang Xiaoliang Wang Chunsheng Li Ye Pang Yong Lu Jonathan Xu Duan Majumdar Sharmila Nelson Sarah J Vigneron Daniel B |
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Affiliation: | Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, USA. |
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Abstract: | A flexible transceiver array, capable of multiple‐purpose imaging applications in vivo at ultrahigh magnetic fields was designed, implemented and tested on a 7 T MR scanner. By alternately placing coil elements with primary and secondary harmonics, improved decoupling among coil elements was accomplished without requiring decoupling circuitry between resonant elements, which is commonly required in high‐frequency transceiver arrays to achieve sufficient element‐isolation during radiofrequency excitation. This flexible array design is capable of maintaining the required decoupling among resonant elements in different array size and geometry and is scalable in coil size and number of resonant elements (i.e., number of channels), yielding improved filling factors for various body parts with different geometry and size. To investigate design feasibility, flexibility, and array performance, a multichannel, 16‐element transceiver array was designed and constructed, and in vivo images of the human head, knee, and hand were acquired using a whole‐body 7 T MR system. Seven Tesla parallel imaging with generalized autocalibrating partially parallel acquisitions (GRAPPA) performed using this flexible transceiver array was also presented. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc. |
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Keywords: | high field flexible coil array microstrip decoupling RF coil parallel imaging parallel excitation 7 T |
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