Functional MRI of the activated human visual cortex.
We explored the possibility of performing functional magnetic resonance imaging of visual evoked response in the primary visual cortex with a clinical MRI imager of 1.5 tesla. Gradient echo pulse sequence was chosen to acquire the functional image and binocular flash visual stimulation by light-proof goggles containing light emitting diodes was used as the source of cerebral activation. Data processing was performed utilizing direct subtraction for averaged images, correlation coefficient, statistical parametric mapping and matched filter. Of those methods, correlation coefficient and statistic parametric mapping proved to be the methods of choice in our study.
Chiu
M J
MJ
Department of Neurology, National Taiwan University Hospital, Taipei, ROC.
Yang
J R
JR
Huang
K M
KM
Chen
J H
JH
D001931:Brain Mapping / Q000295:instrumentation* / Q000379:methods; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D015233:Models, Statistical; D014793:Visual Cortex / Q000502:physiology*