Magnetic susceptibility effects in imaging: Distortion-free images of plant tissue in soil

• Published in: Magnetic resonance imaging Vol. 12; no. 2; pp. 305 - 307
• Main Authors: Kinchesh, P., Randall, E.W., Zick, K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY Elsevier Inc 1994; Elsevier Science
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic Resonance Imaging; Magnetic susceptibility; NMR imaging; Physics; Plant tissue; Plants; Soil; Soil-plant relationships. Soil fertility. Fertilization. Amendments; STRAFI; Stray field imaging; Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipments and techniques; Plant tissue; Soil; STRAFI; Stray field imaging; NMR imaging; Magnetic susceptibility
• ISSN: 0730-725X; 1873-5894
• DOI: 10.1016/0730-725X(94)91542-3

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.