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Abstract #4045

Optimized Quadrature Head Coil Improves SNR in the Brain at 6.5mT

Neha Koonjoo1,2,3, Sheng Shen1,4, Charlotte R Sappo5, and Matthew S Rosen1,2,3
1Department of Radiology, A.A Martinos Center for Biomedical Imaging/MGH, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3Department of Physics, Harvard University, Cambridge, MA, United States, 4State Key laboratory for Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, China, 5Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States

High performance RF coil design is challenging at ultra-low field as rules of thumb learned from high-field may not apply. Previously, we built a 2-channel quadrature head coil with orthogonal B1 fields using an air-core transformer to null the mutual coupling between the coil, however this was unsuccessful in boosting the SNR beyond that of our single-channel spiral volume coil for brain imaging at 276 kHz. Here, a new optimized quadrature coil with a capacitive decoupling element and a new outer layer coil was designed. Images acquired show an expected √2-factor or more enhancement in combined maximum SNR.

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