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Simulation Verification of SNR and Parallel Imaging Improvements by ICE-Decoupled Loop Array in MRI

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Abstract

Transmit/receive L/C loop arrays with the induced current elimination (ICE) or magnetic wall decoupling method have shown high signal-to-noise ratio (SNR) and excellent parallel imaging ability for magnetic resonance imaging at ultrahigh fields, e.g., 7 T. In this study, we aim to numerically analyze the performance of an eight-channel ICE-decoupled loop array at 7 T. Three-dimensional electromagnetic (EM) and radiofrequency circuit co-simulation approach was employed. The values of all capacitors were obtained by optimizing the S-parameters of all coil elements. The EM simulation was used to accurately model the coil structure, the phantom and the excitation fields. All coil elements were well matched to 50 Ω and the isolation between any two coil elements was better −15 dB. The simulated S-parameters were consistent with the experimental results, indicating the simulation results were reliable. Compared with the conventional capacitively decoupled array, the ICE-decoupled array had higher sensitivity at the peripheral areas of the imaging subjects due to the shielding effect of the decoupling loops. The increased receive sensitivity resulted in an improvement of signal intensity and SNR for the ICE-decoupled array.

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Acknowledgments

This study was supported in part by the National Natural Science Foundation of China Grant (51228702) and National Institutes of Health (NIH) R01EB008699.

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Authors and Affiliations

  1. 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

  2. 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

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

    Xinqiang Yan

  4. Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA

    Zhipeng Cao

  5. Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, 94158, 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. Zhipeng Cao
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  3. Xiaoliang Zhang
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Correspondence to Xinqiang Yan.

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Yan, X., Cao, Z. & Zhang, X. Simulation Verification of SNR and Parallel Imaging Improvements by ICE-Decoupled Loop Array in MRI. Appl Magn Reson 47, 395–403 (2016). https://doi.org/10.1007/s00723-016-0764-x

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  • DOI: https://doi.org/10.1007/s00723-016-0764-x

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