A Flexible MRI Array based on Direct-3D-Write Technology at 0.55T

Motivation: MR receiver arrays are typically made from rigid copper which is slow to manufacture and cannot fully conform to imaging anatomy or adapt smoothly during movement. Goal(s): To demonstrate a flexible 4-element array that can conform to target anatomy, can perform well with parallel imaging, and is fast and inexpensive to manufacture Approach: We utilize highly conductive silver-based ink and a fast direct-3D-write method that uses easy to modify components. Results: The flexible array provided good targeted coverage, adequate array decoupling (<7% coupling between elements), and satisfactory parallel imaging performance (average g-factors: 1.1 for rate-2 and 1.4 for rate-3) Impact: Flexible MRI receiver arrays, created using 3D-write technology, can be made to conform to the target imaging anatomy while also offering scalability, low cost, and quick manufacturing. They are conductive enough to provide adequate SNR for effective parallel imaging.