Abstract
The magnet and gradient systems suitable for electron paramagnetic res- onance imaging experiments at RF range are presented. The air-core magnet based on the Helmholtz design in the article has a unique conical shape. A comprehensive study regarding the coils adjustment providing for the maximum field homogeneity is given. The z gradient is a four-coil system (seventh order), the transverse gradients are Golay coils (fifth order), and the scan system is the Helmholtz coil (fourth order). The magnet generates continuously a field of 37 mT (370 G), and the orthogonal gradient coils are designed to yield 100 mT/m (10 G/cm). The experimental tests have shown that the field generated is homogeneous to 610 ppm in the 6 3 6 3 3c m 3 region (x/y/z), which is our field of interest, and to 650 ppm in the 8 3 8 3 4c m 3 region (x/y/z). The system has the potential to monitor temporal changes of oxygen concentration in biological samples. 2013 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 43B: 22-31, 2013
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