Functional magnetic resonance imaging. Magnetic resonance imaging. My discussion: MRI procedure. generate tissue contrast generate spatial localization. larmor frequency and RF pulse. Larmor frequency. RF pulse(classical view). z. B 0. M. . y. x’. y’. x. . Tissue contrast. y.
T2*=T2+static field inhomogeneities
T2 contrast :
TR/TE = 5500/105 ms, 2 Nex, 512x256 matrix
T1 contrast :
TR/TE= 450/14 ms, 1 Nex, 256x192 matrix
*Nex: number of acquisitions
T2* is dependent on the presence of blood deoxygenation and that deoxygenated hemoglobin is a"BOLD" effect that can be observed by FMRI at high magnetic fields
shorter T2* longer T2*
a high resolution scan is taken as background
a series of low resolution scans are taken over time during the experiment
the analyzed low resolution images are shown as colored blobs on top of the original high resolution scan, and also in 3D after proper analysis
The posterior lateral prefrontal cortex is a key neural substrate underlying the central bottleneck of information processing.
Task 1 Task 2