title: Mobile sensor for high resolution NMR spectroscopy and imaging.
abstract: In this work we describe the construction of a mobile NMR tomograph with a highly homogeneous magnetic field. Fast MRI techniques as well as NMR spectroscopy measurements were carried out. The magnet is based on a Halbach array built from identical permanent magnet blocks generating a magnetic field of 0.22T. To shim the field inhomogeneities inherent to magnet arrays constructed from these materials, a shim strategy based on the use of movable magnet blocks is employed. With this approach a reduction of the line-width from approximately 20kHz to less than 0.1kHz was achieved, that is by more than two orders of magnitude, in a volume of 21cm(3). Implementing a RARE sequence, 3D images of different objects placed in this volume were obtained in short experimental times. Moreover, by reducing the sample size to 1cm(3), sub ppm resolution is obtained in (1)H NMR spectra.
authors.affiliation: Institut für Technische Chemie und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, D-52074 Aachen, Germany.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Danieli
authors.forename: Jörg
authors.initials: J
authors.lastname: Mauler
authors.forename: Juan
authors.initials: J
authors.lastname: Perlo
authors.forename: Bernhard
authors.initials: B
authors.lastname: Blümich
authors.forename: Federico
authors.initials: F
authors.lastname: Casanova
mesh_terms: D000465:Algorithms; D002957:Citrus / Q000033:anatomy & histology; D003252:Construction Materials; D003627:Data Interpretation, Statistical; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000706:statistics & numerical data; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation* / Q000706:statistics & numerical data; D028521:Musa / Q000033:anatomy & histology; D019047:Phantoms, Imaging