Masaki Sekino1, Akihisa Miyazoe1,
Hiroyuki Ohsaki1, Tatsuhiro Hisatsune1, Osamu Ozaki2,
Tsukasa Kiyoshi3, Hitoshi Wada3
1The University of Tokyo, Kashiwa,
Japan; 2Kobe Steel Ltd., Kobe, Japan; 3National
Institute for Materials Science, Tsukuba, Japan
MRI
requires a highly homogenous magnetic field zone which usually appears at the
center of the MRI magnet coil. If this homogeneous zone is allowed to occur
at an off-center position along the coil axis, the patient has a wide field
of vision to carry out drawing or other interesting tasks for fMRI. In order
to examine this idea, we fabricated a model magnet consisting of seven NbTi
coils and generating a vertical magnetic field of 0.77 T; coil outer diameter
is 307 mm, coil length 191 mm, designed field homogeneity 5 ppm @ 35mm DSV,
and the location of homogeneous field zone 29.4 mm off-centered along the
vertical coil axis.