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Effect of respiratory and cardiac gating on the major diffusion-imaging metrics

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Title: Effect of respiratory and cardiac gating on the major diffusion-imaging metrics
Authors: Hamaguchi, Hiroyuki Browse this author
Tha, Khin Khin Browse this author →KAKEN DB
Sugimori, Hiroyuki Browse this author
Nakanishi, Mitsuhiro Browse this author
Nakagawa, Shin Browse this author →KAKEN DB
Fujiwara, Taro Browse this author
Yoshida, Hirokazu Browse this author
Takamori, Sayaka Browse this author
Shirato, Hiroki Browse this author →KAKEN DB
Keywords: Mean kurtosis
fractional anisotropy
mean diffusivity
respiratory gating
cardiac gating
Issue Date: Aug-2016
Publisher: SAGE Publications
Journal Title: The neuroradiology journal
Volume: 29
Issue: 4
Start Page: 254
End Page: 259
Publisher DOI: 10.1177/1971400916643337
Abstract: The effect of respiratory gating on the major diffusion-imaging metrics and that of cardiac gating on mean kurtosis (MK) are not known. For evaluation of whether the major diffusion-imaging metrics-MK, fractional anisotropy (FA), and mean diffusivity (MD) of the brain-varied between gated and non-gated acquisitions, respiratory-gated, cardiac-gated, and non-gated diffusion-imaging of the brain were performed in 10 healthy volunteers. MK, FA, and MD maps were constructed for all acquisitions, and the histograms were constructed. The normalized peak height and location of the histograms were compared among the acquisitions by use of Friedman and post hoc Wilcoxon tests. The effect of the repetition time (TR) on the diffusion-imaging metrics was also tested, and we corrected for its variation among acquisitions, if necessary. The results showed a shift in the peak location of the MK and MD histograms to the right with an increase in TR (p <= 0.01). The corrected peak location of the MK histograms, the normalized peak height of the FA histograms, the normalized peak height and the corrected peak location of the MD histograms varied significantly between the gated and non-gated acquisitions (p < 0.05). These results imply an influence of respiration and cardiac pulsation on the major diffusion-imaging metrics. The gating conditions must be kept identical if reproducible results are to be achieved.
Type: article (author version)
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Khin Khin Tha

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