Monolithic MACS micro resonators

J.A. Lehmann-Horn (1) , J.-F Jacquinot (1) , J.-C. Ginefri (2) , Christian Bonhomme (3) , D Sakellariou (1)

1 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
2 IR4M - Imagerie par Résonance Magnétique Médicale et Multi-Modalités
3 SMiLES - Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé

Magic Angle Coil Spinning (MACS) aids improving the intrinsically low NMR sensitivity of heterogeneous microscopic samples. We report on the design and testing of a new type of monolithic 2D MACS res-onators to overcome known limitations of conventional micro coils. The resonators' conductors were printed on dielectric substrate and tuned without utilizing lumped element capacitors. Self-resonance conditions have been computed by a hybrid FEM-MoM technique. Preliminary results reported here indicate robust mechanical stability, reduced eddy currents heating and negligible susceptibility effects. The gain in B 1 = ffiffiffi P p is in agreement with the NMR sensitivity enhancement according to the principle of reciprocity. A sensitivity enhancement larger than 3 has been achieved in a monolithic micro resonator inside a standard 4 mm rotor at 500 MHz. These 2D resonators could offer higher performance micro-detection and ease of use of heterogeneous microscopic substances such as biomedical samples, microscopic specimens and thin film materials.

Domaines: Matériaux

J.A. Lehmann-Horn, J.-F Jacquinot, J.-C. Ginefri, Christian Bonhomme, D Sakellariou. Monolithic MACS micro resonators. Journal of Magnetic Resonance, 2016, 271, pp.46-51. ⟨10.1016/j.jmr.2016.07.013⟩. ⟨cea-01355275⟩