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- Title
Fractional anisotropy and mean diffusivity: comparison between 3.0-T and 1.5-T diffusion tensor imaging with parallel imaging using histogram and region of interest analysis.
- Authors
Fushimi, Yasutaka; Miki, Yukio; Okada, Tsutomu; Yamamoto, Akira; Mori, Nobuyuki; Hanakawa, Takashi; Urayama, Shin-ichi; Aso, Toshihiko; Fukuyama, Hidenao; Kikuta, Ken-ichiro; Togashi, Kaori
- Abstract
We performed a comparison study focusing on differences in fractional anisotropy (FA) and mean diffusivity (MD) between 3-T and 1.5-T diffusion tensor imaging (DTI) with parallel imaging. Thirty healthy volunteers underwent DTI with an eight-channel phased-array coil at both 3 T and 1.5 T. Histogram and region of interest (ROI) analyses were performed. Paired t tests were applied for statistical analysis. Signal-to-noise ratios of these regions were also measured. For histogram analysis, peak location of FA was significantly lower at 3 T than at 1.5 T ( P = 0.04). Mean FA was significantly higher at 3 T than at 1.5 T ( P = 0.002). Peak location of MD was significantly lower at 3 T than at 1.5 T ( P < 0.001). Mean MD was significantly lower at 3 T than at 1.5 T ( P < 0.001). In ROI analysis, FA was significantly larger at 3 T than at 1.5 T in the centrum semiovale ( P < 0.001), middle cerebellar peduncle ( P < 0.001), cerebral peduncle ( P = 0.006), posterior limb of the internal capsule ( P = 0.007), genu ( P < 0.001) and splenium ( P < 0.001). FA was significantly lower at 3 T than at 1.5 T in the globus pallidus ( P < 0.001). MD was significantly smaller at 3 T than at 1.5 T in the globus pallidus ( P = 0.007), thalamus ( P < 0.001), centrum semiovale ( P < 0.001), middle cerebellar peduncle ( P < 0.001), cerebral peduncle ( P = 0.01), posterior limb of the internal capsule ( P < 0.001), genu ( P = 0.01) and splenium ( P < 0.001). Significant differences in FA and MD exist between 3 T and 1.5 T for whole-brain histogram analysis and ROI analysis. Copyright © 2007 John Wiley & Sons, Ltd.
- Publication
NMR in Biomedicine, 2007, Vol 20, Issue 8, p743
- ISSN
0952-3480
- Publication type
Article
- DOI
10.1002/nbm.1139