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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: New Instruments and Methods

CPP 11.3: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Compact magnet array for portable high-resolution NMR and Imaging — •Ernesto Danieli, Juan Perlo, Bernhard Blümich, and Federico Casanova — ITMC, RWTH Aachen University, Worringerweg 1, D-52074,Aachen, Germany

Portable NMR probes built from permanent magnets offer several advantages over conventional NMR systems. However, the inhomogeneity of the magnetic field generated by these sensors precludes their use in high resolution NMR spectroscopy and MRI. Recently we have demonstrated that the inhomogeneities of the magnetic field can be removed by providing the sensor with movable permanent magnets which allows generating and controlling harmonic field corrections by a mechanical shimming approach [1,2]. In this work we present a high-performance magnet design based on this concept, which enables us to reduce the size of the magnet keeping the field strength and the sample volume constant. In particular, it was used to build a palm size magnet working in a volume large enough to fit conventional 5 mm NMR tubes where the high field homogeneity allowed us to measure proton NMR spectra of different solvents with a resolution better than 0.16 ppm at 30 MHz. By scaling the dimensions of the magnet the same geometry was optimized to build a portable MRI scanner for imaging samples of 4 cm DSV

1. J. Perlo, F. Casanova, and B. Blümich, Science, 315 (2007) 1110-1112.

2. E. Danieli, J. Mauler, J. Perlo, B. Blumich, and F. Casanova, J. Magn. Reson., 198 (2009) 80-87