Applied Magnetic Resonance

, Volume 46, Issue 5, pp 541–550 | Cite as

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

  • Xinqiang YanEmail author
  • Long Wei
  • Rong Xue
  • Xiaoliang ZhangEmail author


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.


Human Head Hybrid Array Coil Element Loop Channel Ultrahigh Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  1. 1.Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Beijing Engineering Research Center of Radiographic Techniques and EquipmentBeijingChina
  3. 3.State Key Laboratory of Brain and Cognitive Science, Beijing MRI Center for Brain Research, Institute of BiophysicsChinese Academy of SciencesBeijingChina
  4. 4.China and Beijing Institute for Brain DisordersBeijingChina
  5. 5.Department of Radiology and Biomedical ImagingUniversity of California San FranciscoSan FranciscoUSA
  6. 6.UCSF/UC Berkeley Joint Graduate Group in BioengineeringSan FranciscoUSA

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