X-rays to construct a picture of the living brain based on the water content of various tissues. It is a three-dimensional image of the brain or body, based on its response to a magnetic field; method of imaging a living brain by using a magnetic field and a radio frequency field to make atoms with odd atomic weights all rotate in the same direction and then removing those fields and measuring the energy that the atoms release Moreover, Magnetic resonance imaging (MRI) is to a method of measuring both brain structure and brain function through the construction of a magnetic field that affects hydrogen atoms in the brain, emitting signals that a computer then records and uses to produce a threedimensional image of the brain
Electroencephalogram in which a three-dimensional magnetic field of the brain can then be calculated. Superconducting quantum interference device (SQUID) detects the small magnetic fields in the brain that are a marker of neural activity. A disadvantage of MEG is related to that it is expensive and not readily available for clinical applications.