(Color online) (a) Equipment for positioning a NMR probe in the homogeneous field zone of the magnet. (b) Iron pieces attached to an aluminum cylinder for passive shimming. (c) Magnetic field distribution measured after shimming. The distribution was plotted on a sphere located at the center of the homogeneous field zone. The parameters ϕ and z indicate the longitude and axial position, respectively. The absolute value at 0 ppm is 787.907 mT.
(Color online) Experimental setup for measuring NMR and MRI.
(Color online) (a) Circuit diagram of RF coil for MRI. (b) Schematic of the RF coil.
1H NMR spectra of water (a) before and (b) after performing an active shim. The vertical axes in the two figures have an arbitrary unit but the same scale, which enables us to compare the two spectra. The absolute value at 0 ppm is 32.970 MHz.
(Color online) (a) MRI of water in a spherical container. (b) MRI of okra.
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