What is FMRI?
FMRI is a device used by doctors or other medical staff to map brain activity. Means functional magnetic resonance imaging . f at the beginning of fmri is not capitalized if at the beginning of the sentence. For this reason, people with pacemakers are warned not to approach FMRI machines. Patients must remove metal objects before entering the machine. To enter the machine, the patient lies on the horizontal platform of the type of stretcher that slips into the cylindrical cavity. The patient is scanned magnetically from all sides and is created in real time that is presented to doctors for further analysis.
The FMRI machine works using the principle of magnetic resonance imaging. The practice was previously known as magnetic resonant tomography (MRT) or nuclear magnetic resonance imaging (NMR).
Magnetic resonance resonance works as a follow. For more than 100 years, blood has been known to flow into certain areas of the brain when these areas are active. This is because active neuronsThey consume more blood than idle neurons. Red blood cells carry a substance called hemoglobin throughout the body, including active neurons. When the neuron is active, it consumes more oxygen it receives in the form of hemoglobin.
Hemoglobin is a "oxygen storage molecule" that is able to release and absorb oxygen several times. Red blood cells contain enough hemoglobin, which is oxygenated by air from the lungs, and then deoxygenated when the cells are supplied with oxygen. Oxygenated and deoxygenated hemoglobin have various magnetic properties.
oxygenated hemoglobin is diamagnetic, which means that it slightly repels the magnetic field. Deoxygenated hemoglobin is paramagnetic, which means that the application of an external field causes to become slightly magnetic. Both effects are small but measurable.
deoxygenation of hemoglobin in active nerve areas is what FMRI machinelifts. This occurs a few seconds after the nerve activity itself. FMRI machines have been criticized as a scientific instrument for many reasons, including that some FMRI interpretation theories are restless and that different parts of the brain can consume more or less oxygen, even if they are roughly the same level of activity. Regardless, FMRI has been successfully used to diagnose various brain problems for years. In psychology, it is also used to study which tasks activate which brain areas.