1. Ren, Z., Xie, D. & Li, H. Study on shimming method for open permanent magnet of mri. Progress In Electromagnetics Research 6, 23–34 (2009).
2. McGinley, J. V., Srivastava, V. C. & DeMeester, G. D. Passive shimming technique for mri magnets. US Patent 5,532,597 (1996).
3. Jesmanowicz, A., Hyde, J. S., Punchard, W. F. & Starewicz, P. M. Method for shimming a static magnetic field in a local mri coil US Patent 6,294,972 (2001).
4. Jezzard, P. Shim coil design, limitations and implications. In International Society of Magnetic Resonance in Medicine (ISMRM) Annual Meeting (2006).
5. Anderson, W. A. Electrical current shims for correcting magnetic fields. Review of Scientific Instruments 32, 241–250 (1961).