Sung Suk Oh1, SungDae Yun1,
Bumseok Jeong2, HyunWook Park1
1Department of Electrical Engineering,
KAIST, Daejeon, Korea, Republic of; 2Department of Psychiatry,
Eulji University Hospital, Daejeon, Korea, Republic of
The
signal loss by the susceptibility artifact makes it difficult analyze the
fMRI data of the orbitofrontal region of the brain. In addition, an EPI
sequence, which is used in many fMRI experiments, has the geometric
distortion and Nyqust ghosts. For the fMRI experiment with correction of
these artifact and distortion, we used a flat RF pulse which provides nearly
constant signal intensity against the magnetic susceptibility and a gradient
echo sequence. In the result, it is shown that the signal loss in the
orbitofrontal region of the brain is recovered without geometric distortion
and Nyqust ghosts and the activation in that region was analyzed
successfully.