Yoshitaka Bito1, Koji Hirata1,
Satoshi Hirata1, Toru Shirai1, Toshihiko Ebisu2,
Yuko Kawai3, Yosuke Otake1, Yoshihisa Soutome1,
Hisaaki Ochi1, Masahiro Umeda3, Toshihiro Higuchi4,
Chuzo Tanaka4
1Central Research Laboratory, Hitachi,
Ltd., Kokubunji-shi, Tokyo, Japan; 2Neurosurgery, Nantan General
Hospital, Nantan-shi, Kyoto, Japan; 3Medical Informatics, Meiji
University of Integrative Medicine, Nantan-shi, Kyoto, Japan; 4Neurosurgery,
Meiji University of Integrative Medicine, Nantan-shi, Kyoto, Japan
High-speed
spectroscopic imaging using the echo-planar technique is sometimes distorted by
eddy currents. We developed an eddy current correction technique for
time-domain-interleaved blipped-phase-encoding echo-planar spectroscopic
imaging (TDI-BPE-EPSI). This technique uses correction of spatial shift due
to chemical shifts in the blipped-phase-encoding direction before applying
eddy current correction based on the water signal. Correction of eddy
currents is demonstrated by applying this technique to a phantom and a rat
brain in vivo. This technique is shown to be also useful in diffusion-weighted
spectroscopic imaging, which causes more eddy currents due to strong
diffusion gradients.