ИСТИНА

Despite the theoretical difficulties there are modern approved medical techniques using magnetic phenomena. Most of them can be grouped into the following types: (1) Magnetic fields are used indirectly to control (move) ferromagnetic (nano)materials or devices in the body. There is considerable interest in magnetic manipulation systems for current and future minimally invasive medical applications, including direct drug delivery systems based on nanotechnology. (2) Time varying magnetic fields produce electric currents in the body. The well-known application of this type is magnetic hyperthermia. (3) Static or slowly changing magnetic fields are measured with very high sensitivity and accuracy to study electrical activity in the human body (for example, a magnetoencephalogram of the brain). (4) Magnetic tomography methods make a breakthrough in diagnostics. The most well-known method is the MRI based on the nuclear magnetic resonance. However, other types of magnetic tomography based on the electron paramagnetic resonance or superparamagnetism of nanoparticles are also actively developing.