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Hybrid Monopole/Loop Coil Array for Human Head MR Imaging at 7 T

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Abstract

The monopole coil and loop coil have orthogonal radiofrequency (RF) fields and thus are intrinsically decoupled electromagnetically if they are laid out appropriately. In this study, we proposed a hybrid monopole/loop technique which could combine the advantages of both loop arrays and monopole arrays. To investigate this technique, a hybrid RF coil array containing four monopole channels and four loop channels was developed for human head magnetic resonance (MR) imaging at 7 T. In vivo MR imaging and g-factor results using monopole-only channels, loop-only channels and all channels of the hybrid array were acquired and evaluated. Compared with the monopole-only and loop-only channels, the proposed hybrid array has the higher signal-to-noise ratio (SNR) and better parallel imaging performance. Sufficient electromagnetic decoupling and diverse RF magnetic field (B1) distributions of monopole channels and loop channels may contribute to this performance improvement. From experimental results, the hybrid monopole/loop array has low g-factor and excellent SNR at both periphery and center of the brain, which is valuable for human head imaging at ultrahigh fields.

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Acknowledgments

This work was supported in part by the Chinese National Major Scientific Equipment R&D Project (Grant No. ZDYZ2010-2), the Ministry of Science and Technology of China Grant (2012CB825500), the National Natural Science Foundation of China Grant (51228702), the Chinese Academy of Sciences Grants (XDB02010001, XDB02050001) and National Institutes of Health (NIH) R01EB008699.

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Authors and Affiliations

  1. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing, 100049, China

    Xinqiang Yan & Long Wei

  2. Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing, 100049, China

    Xinqiang Yan & Long Wei

  3. State Key Laboratory of Brain and Cognitive Science, Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China

    Xinqiang Yan & Rong Xue

  4. China and Beijing Institute for Brain Disorders, Beijing, 100053, China

    Rong Xue

  5. Department of Radiology and Biomedical Imaging, University of California San Francisco, Byers Hall, Room 102, 1700 4th St, San Francisco, CA, 94158-2330, USA

    Xiaoliang Zhang

  6. UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, CA, 94158, USA

    Xiaoliang Zhang

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  1. Xinqiang Yan
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  2. Long Wei
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  3. Rong Xue
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Correspondence to Xinqiang Yan or Xiaoliang Zhang.

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Yan, X., Wei, L., Xue, R. et al. Hybrid Monopole/Loop Coil Array for Human Head MR Imaging at 7 T. Appl Magn Reson 46, 541–550 (2015). https://doi.org/10.1007/s00723-015-0656-5

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  • DOI: https://doi.org/10.1007/s00723-015-0656-5

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