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Brain Imaging with Slotted Hybridized Magnetic Metamaterial Hat at 7-T MRI

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Abstract

Study of human pathologies and acquisition of anatomical images without any surgical intervention inside human body is possible because of magnetic resonance imaging (MRI), which is the keystone technique to characterize the psychology and neurochemistry of human body. However, for clinical trials, the study and cure of human diseases are followed by medical investigations of different animal anatomies. By employing different imaging techniques to animal anatomical models during their clinical trials yielded in exceptional image acquisition without any surgical invasion in the model, which resulted in noninvasive technique as compared to surgical invasion and opened the possibility to study human pathologies more precisely. This work exploits the notable properties of unique combination of multi-circular hybridized surface coils which can be used as hybridized magnetic metamaterial hat (HMMH). HMMH not only strengthens the uniformity of radio frequency (RF) rotational symmetry around its axis but also improves the signal-to-noise ratio (SNR) for rat’s brain imaging at 7-T MRI. We analyzed a periodic array of strongly coupled circular copper coils attached on circular coil shaped printed circuit board (PCB) substrate. In the design, some copper coils were inspired by the slot cavity loaded with parametric elements (capacitor and inductor). In addition, coils in the form of HMMH exploited the advantages of the hybrid modes which exhibited better and deeper RF sensitivity into the region of interest (ROI) as compared to single loop RF coil by exciting two Eigen modes simultaneously which resulted in homogenized magnetic field (B-field) and enhanced SNR at ROI. At resonance, the value of relative negative permeability, μ r  = −7 + j11 was achieved at 300 MHz for 7-T MRI. Furthermore, image quality at ROI was optimized by varying rat’s head position under magnetic resonance (MR) coil of MRI apparatus and in the presence or absence of HMMH. Design configuration and circuit model analysis were also done.

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Acknowledgements

We are grateful to the partial supports from NSFCs 61271085 (National Natural Science Foundation of China.

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Authors and Affiliations

  1. State Key Lab of Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University, Hangzhou, 310058, China

    Hassan Ali, Erik Forsberg & Hu Jun

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  1. Hassan Ali
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  2. Erik Forsberg
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  3. Hu Jun
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Correspondence to Hassan Ali.

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Ali, H., Forsberg, E. & Jun, H. Brain Imaging with Slotted Hybridized Magnetic Metamaterial Hat at 7-T MRI. Appl Magn Reson 48, 67–83 (2017). https://doi.org/10.1007/s00723-016-0848-7

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  • DOI: https://doi.org/10.1007/s00723-016-0848-7

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