Abstract #4045

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

Neha Koonjoo^1,2,3, Sheng Shen^1,4, Charlotte R Sappo⁵, and Matthew S Rosen^1,2,3

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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