Abstract
Radiofrequency (RF) coil arrays with high count of elements, e.g., closely spaced multi-row arrays, exhibit superior parallel imaging performance in magnetic resonance imaging (MRI). However, it is technically challenging and time-consuming to build multi-row arrays due to complex coupling issues. This paper presents a novel and simple method for closely spaced multi-row RF array designs. Induced current elimination decoupling method has shown the capability of reducing coupling between microstrip elements from different rows. In this study, its capability for decoupling array elements from the same row was investigated and validated by bench tests, with an isolation improvement from −8.9 to −20.7 dB. Based on this feature, a closely spaced double-row microstrip array with 16 elements was built at 7 T. S 21 between any two elements of the 16-channel closely spaced double-row microstrip array was better than −14 dB. In addition, its feasibility and performance was validated by MRI experiments. No significant image reconstruction-related noise amplifications were observed for parallel imaging even when reduced factor (R) achieves 4. The experimental results demonstrated that the proposed design might be a simple and efficient approach in fabricating closely spaced multi-row RF arrays.
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Acknowledgments
This work was supported in part by the Chinese National Major Scientific Equipment R&D Project under Grant ZDYZ2010-2, in part by the Ministry of Science and Technology of China under Grant 2012CB825500, in part by the National Natural Science Foundation of China under Grant 51228702 and Grant 91132302, and in part by the National Institutes of Health (NIH), USA under Grant R01EB008699.
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Yan, X., Xue, R. & Zhang, X. Closely Spaced Double-Row Microstrip RF Arrays for Parallel MR Imaging at Ultrahigh Fields. Appl Magn Reson 46, 1239–1248 (2015). https://doi.org/10.1007/s00723-015-0712-1
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DOI: https://doi.org/10.1007/s00723-015-0712-1