Functional magnetic resonance imaging at 1.5 T during sensorimotor and cognitive task.
Functional activations of the human brain cortex were observed with a standard 1.5-tesla MR imaging system using a long time echo fast low-angle shot sequence. Neural activation increases regional cerebral blood flow resulting in increased capillaries and venous blood oxygenation. Processing requires adapted algorithms because the time course of intensity signal showed fluctuations of the baseline. The use of a 'follow-up' method to generate activation maps is proposed. Brain activation was detected in striate cortex during photic stimulation and in sensorimotor areas while subjects were moving their hands. In mental imagery tasks, we observed a primary and secondary visual cortex activation during memory recall of the flashing light. Motor ideation showed an activation of the rolandic areas.
Sabbah
P
P
Department of Neuroradiology, Hospital La Timone, France.
Simond
G
G
Levrier
O
O
Habib
M
M
Trabaud
V
V
Murayama
N
N
Mazoyer
B M
BM
Briant
J F
JF
Raybaud
C
C
Salamon
G
G
D000328:Adult; D000465:Algorithms; D001143:Arousal / Q000502:physiology*; D001288:Attention / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods; D002540:Cerebral Cortex / Q000098:blood supply* / Q000502:physiology; D003071:Cognition / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D011939:Mental Recall / Q000502:physiology; D009044:Motor Cortex / Q000098:blood supply; D010101:Oxygen Consumption / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D012039:Regional Blood Flow / Q000502:physiology; D013003:Somatosensory Cortex / Q000098:blood supply / Q000502:physiology; D014793:Visual Cortex / Q000098:blood supply / Q000502:physiology; D014796:Visual Perception / Q000502:physiology