BOLD - effect

= Blood Oxygenation Level Dependent - effect


Performing a task (i.e. finger-tapping, flicker-light) increases regional oxygen consumption.

Physiological effect

Physical effect     Less deoxyhemoglobin
-> Less susceptibility difference between capillary vessel  and  brain tissue
-> Longer T2*
-> signal increase in T2*-sensitive pulse sequences
 
 

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