Superconducting magnets are most used in MRI systems. The features of superconducting magnets are high magnetic field generation and highly stable magnetic field. Superconducting magnets are also energy-saving devices for electromagnets. In this paper, I described the basics of superconductivity, introduced the superconducting wires used in magnets, and explained cryogenic heat insulation technology, superconducting connection technology, and design method for a highly uniform magnetic field as technologies used in superconducting magnets. Then, I introduced development trends in helium saving magnets and high temperature superconducting magnets that do not use liquid helium to solve the recent helium problem.

　The surgical treatment of schwannomas is a subject of much discussion. However, no consensus has been reached regarding when surgery should be performed. We report a case where magnetic resonance imaging was used to determine a treatment strategy for a schwannoma originating from the cervical nerve. We also report on the surgical approach followed that accounts for the postoperative neuropathic pain experienced by our patient.

　Geometric information obtained from MRI is widely used for various applications, including voxel-based morphometry for brain volume measurement, radiation therapy planning, and MRI-guided radiation therapy.

　Sources of geometrical errors in MRI primarily include MRI system-related and scanned object-related inaccuracies. MRI system-related errors include those associated with gradient coil linearity and pulse sequence design issues, whereas scanned object-related errors include those attributable to static magnetic field uniformity and chemical shift. In this review, we discuss the association between sources of errors and geometrical errors and also the geometric distortion measurement method.