Sähkömagnetografia

Sähkömagnetografia, often translated as electromagneticography, is a non-invasive diagnostic technique used in various fields, particularly in medicine and geophysics. It operates on the principle of generating and detecting electromagnetic fields to image internal structures or properties. In medical applications, sähkömagnetografia can be used to map electrical activity in the brain, such as in magnetoencephalography (MEG), which measures the magnetic fields produced by electrical currents in the brain. This allows for the study of brain function and the localization of neurological disorders. Another medical application involves using electromagnetic waves to detect and differentiate tissues based on their electrical conductivity, which can be useful in imaging tumors or other abnormalities.

In geophysics, sähkömagnetografia, often referred to as electromagnetic surveying, is employed to investigate the subsurface. By transmitting controlled electromagnetic signals into the ground and measuring the resulting secondary fields, geophysicists can infer the electrical properties of different geological layers. This information is crucial for mineral exploration, groundwater studies, and environmental assessments, helping to identify the presence of conductive ore bodies, saline water intrusion, or buried contaminants. The depth and resolution of investigation depend on the frequency of the electromagnetic waves used and the conductivity contrast of the subsurface materials.