[Motor functional MRI by spiral scan--compared with GRE].
Recently, functional MRI (fMRI) has been performed in two methods using 1.5 tesla machine. One was performed using gradient recalled echo (GRE), the other was performed using echo planner imaging (EPI). There is a third method for fMRI called spiral scan. This method is applicable without strong gradient magnetic field such as required by EPI. In this study, motor fMRI was performed in ten normal volunteers by both spiral scan and GRE. Less than 1% risk (t-test), spiral scan showed the reactive area more clearly than GRE. And GRE showed higher signal intensity changing ratio than spiral scan, but there was no significant difference between spiral scan and GRE. The acquisition time of spiral scan was 2 seconds per image, and that of GRE was 10.5 seconds. Spiral scan has good temporal resolution and contrast-noise ratio. These are very advantageous for fMRI.
Ito
T
T
Department of Neurological Surgery, Okayama Ryogo Center.
Aihara
H
H
Kinugasa
K
K
Handa
H
H
Kinoshita
K
K
Asari
S
S
Ohmoto
T
T
Takahashi
Y
Y
D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D009043:Motor Activity / Q000502:physiology; D009044:Motor Cortex / Q000033:anatomy & histology / Q000502:physiology*