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关于MASK,请教,十分感谢! | Forum of resting-state fMRI

关于MASK,请教,十分感谢!

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在你们的文章中写到:“The global mean ALFF value was calculated for each participant within a group GM mask obtained by selecting a threshold of 0.2 on the mean GM map of all 54 subjects. ”(Human Brain Mapping 2012)
想请问:这里的0.2是指什么值,这种设定MASK的做法是在MRIcro--ROI--Apply intensity filter to volume中做的吗?

该做法能否应用于设置WM MASK?
其他文献中有提到的做法是:”The resulting segmented WM and CSF images were then thresholded to ensure 80% tissue type probability. “这种做法和你们采用的是否一致?

Re

 0.2是概率值阈值。
REST->Utilities->Image Calcualtor-> i1>0.2

可以。

你得到的做法有可能是每个个体卡0.8,我们是先在组上平均再卡的0.2。

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