Enumerate the working of MRI scanner
The MRI scanner can be 'tuned' to detect the very subtle disturbances to the magnetic field induced by the different proportions of oxygenated and deoxygenated blood in active and inactive regions. The so-called BOLD (blood oxygenated level dependent) signal can be further improved by the use of more powerful magnets in the scanner, and the spatial resolution (which generates the structural scans) is barely compromised.