Abstract
Magnetic susceptibility effects (MSE) in NMR spectra are well known, and indeed the NMR technique has frequently been applied to measure magnetic susceptibility. In the case of imaging, MSE can lead to image distortion when the sample is heterogeneous. We have performed experiments on a soil sample (iron content ≈ 2%) containing plant tissue which gave a NMR signal that was spread over about 15 kHz in the 1H spectrum. We present some results from a 128 × 128 × 128 3D 1H image (voxel size = 150 × 150 × 150 μm 3) generated by the stray field imaging (STRAFI) technique in which the use of a 5 kG cm −1 magnetic flux density gradient reduced the magnetic susceptibility distortion to less than 10 μm.
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