A Phantom Study to Investigate Fat Suppression in DWIBS

Abstract

　Diffusion-weighted whole body imaging with background body signal suppression uses the short time inversion (TI) recovery (STIR) method, which is effective against the inhomogeneity of a magnetic field, for fat suppression. Oil causes chemical shifts with different transfer amounts, owing to the change in its chemical structure, and the null points of CH₂ and olefins present different values. Consequently, fat cannot be completely suppressed by the STIR method, and it is necessary to combine it with other fat suppression methods. In this study, using phantom imaging proposed by the authors with SSRF, both 1.5T and 3.0T fat suppression effects were improved. The null point was prolonged using CHESS with STIR. In this case, the fat suppression effect decreased with the same TI as that of the STIR.