Abstract #4241

Gradient coil design and optimization with equivalent magnetic dipole method for ultra-low field MRI systems

Sheng Shen^1,2, Zheng Xu¹, Neha Koonjoo^2,3,4, and Matthew S. Rosen^2,3,4

¹Chongqing University, Chongqing, China, ²MGH/A.A. Martinos Center for Biomedical Imaging, Cambridge, MA, United States, ³Department of Physics, Harvard University, Cambridge, MA, United States, ⁴Harvard Medical School, Boston, MA, United States

The gradient subsystem is an essential part of an MRI system. Figures of merit for these systems include slew rate and the gradient field linearity. Our previously described 6.5 mT ultra-low-field MRI scanner has marginal gradient performance with low slew rates (minimal rise time of 750µs) and low efficiency (around 10µT/m/A). We describe here the optimization of a new gradient coil system with improved slew rate and efficiency. We introduce the equivalent magnetic dipole method to design biplanar gradient coils, and our design study of the geometric parameters of the gradient coil (including the coil pattern, its size and density).

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