MRI USES a powerful magnetic field, low intensity radio-frequency pulses, and data-processing software to create detailed images of soft tissue, muscles, nerves, fat and bones.

Based on the spatial distribution of magnetic dipole, the equation of the normal component of leakage magnetic field on the tube surface under low-intensity field was derived.

Objectives to investigate intensity of extremely low frequency magnetic field (ELFMF) emitted from cathode-ray tubes (CRT) of monitors in various directions and to find ways to avoid its influence.