Li‘s 核磁共振影像数据处理

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查看影像基本信息 fslinfo MNI152_T1_2mm_brain.nii.gz

查看影像更加详细的信息 fslhd MNI152_T1_2mm_brain.nii.gz 选填参数 -x，以XML格式输出。 “Don’t worry if you don’t know what every field means.”

fslstats MNI152_T1_2mm_brain.nii.gz -m -M 使用方法和可选参数： Usage: fslstats [preoptions] [options]

preoption -t will give a separate output line for each 3D volume of a 4D timeseries preoption -K < indexMask > will generate seperate n submasks from indexMask, for indexvalues 1…n where n is the maximum index value in indexMask, and generate statistics for each submask Note - options are applied in order, e.g. -M -l 10 -M will report the non-zero mean, apply a threshold and then report the new nonzero mean

-l : set lower threshold -u : set upper threshold -r: output -R: output -e: output mean entropy ; mean(-i*ln(i)) -E: output mean entropy (of nonzero voxels) -v: output -V: output (for nonzero voxels) -m: output mean -M: output mean (for nonzero voxels) -s: output standard deviation -S: output standard deviation (for nonzero voxels) -w: output smallest ROI containing nonzero voxels -x: output co-ordinates of maximum voxel -X: output co-ordinates of minimum voxel -c: output centre-of-gravity (cog) in mm coordinates -C: output centre-of-gravity (cog) in voxel coordinates -p : output nth percentile (n between 0 and 100) -P : output nth percentile (for nonzero voxels) -a: use absolute values of all image intensities -n: treat NaN or Inf as zero for subsequent stats -k : use the specified image (filename) for masking - overrides lower and upper thresholds -d : take the difference between the base image and the image specified here -h : output a histogram (for the thresholded/masked voxels only) with nbins -H : output a histogram (for the thresholded/masked voxels only) with nbins and histogram limits of min and max

Note - thresholds are not inclusive ie lthresh