Two- and three-dimensional multinuclear stray-field imaging of rotating samples with magic-angle spinning (STRAFI-MAS): from bio to inorganic materials.
OBJECTIVE
To revisit and illustrate the potential of a simple and effective multidimensional stray-field imaging technique with magic-angle spinning, known as STRAFI-MAS.


METHODS
STRAFI-MAS images are acquired with a standard NMR magnet and a traditional magic-angle sample spinning (MAS) probe. The stray-field gradients are achieved by placing the MAS probe, along the z-direction, at a distance from the center of the magnet. No pulsed-field gradients are applied. The multidimensional spatial encoding is carried out by synchronizing the radiofrequency pulses with the sample MAS rotation.


RESULTS
Two-dimensional (2D) and 3D multinuclear images of various phantoms, including a tibia bone and silicon carbide, are recorded. Images of inorganic solids containing quadrupolar nuclei, (23)Na and (27)Al, are also explored for the first time by STRAFI-MAS.


CONCLUSIONS
We have demonstrated that STRAFI-MAS is a simple and user-friendly technique for multidimensional imaging without the need of imaging equipment. With the current advancements in NMR and MRI methodologies, STRAFI-MAS is expected to be further developed and improved. We anticipate that STRAFI-MAS can spark a wide spectrum of interest, from material to bio science, where can benefit from high-resolution images.
Wong
Alan
A
UMR 3299 CEA Saclay, DSM/IRAMIS/CNRS-SIS2M/LSDRM, F-91191, Gif-sur-Yvette Cedex, France.
Sakellariou
Dimitris
D
D000535:Aluminum / Q000737:chemistry; D016880:Anisotropy; D001672:Biocompatible Materials / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry*; D003952:Diagnostic Imaging / Q000379:methods; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D019047:Phantoms, Imaging; D012825:Silicon / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry; D013977:Tibia / Q000473:pathology*; D014867:Water / Q000737:chemistry
D001672:Biocompatible Materials; D017554:Carbon Compounds, Inorganic; D017655:Silicon Compounds; D014867:Water; D012964:Sodium; D000535:Aluminum; C022088:silicon carbide; D012825:Silicon