### Magnet Topology - Halbach Array - transverse B field - current design - fewer fringe magnetic fields - Aubert Ring Pair - longitudinal B field - 6.4800 - [[kuang_handheld-mri.pdf]] - harder to optimize, partly due to fringe fields Clinical MR gradient strength typically $10 \mathrm{~mT/m}$ Capacitive coupling between gradient coils and RF coils - particularly problematic for low-field MRI ![[Pasted image 20261014204035.png|479]] ### Magnet Creates a uniform B0 field through the middle ### Gradient Coils Alters B field in x, y, and z ### RF Coils