Magneto-Inductive Catheter Receiver for Magnetic Resonance Imaging

作者：Syms Richard R A^*; Young Ian R; Ahmad Munir M; Taylor Robinson Simon D; Rea Marc

来源：IEEE Transactions on Biomedical Engineering, 2013, 60(9): 2421-2431.

DOI：10.1109/TBME.2013.2258020

• Microcoil
• magnetic resonance imaging
• magneto-inductive waveguide
• metamaterial

A catheter-based RF receiver for internal magnetic resonance imaging is demonstrated. The device consists of a double-sided thin-film circuit, wrapped around a hollow catheter and sealed in place with heat-shrink tubing. Signals are detected using a resonant LC circuit at the catheter tip and transmitted along the catheter using an array of coupled LC circuits arranged as a magneto-inductive waveguide, a form of low frequency metamaterial. Coupling to a conventional RF system is accomplished using a demountable inductive transducer. Protection against external B-1 and E fields is obtained by using figure-of-eight elements with an electrical length shorter than that of an immersed dipole. The system is primarily designed for biliary imaging, can pass the biopsy channel of a side-opening duodenoscope, and is guidewire-compatible, potentially allowing clinicians to implement MR image guided procedures without changing their standard practice. Decoupling against B-1 and E fields is verified, and in vitro H-1 magnetic resonance imaging with submillimeter resolution is demonstrated at 1.5 T using phantoms.

• 出版日期2013-9