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Brain CT pre-process workflow. Step 1: brain extraction. Step 2: 2D rigid registration. Step 3: Median filter and intensity thresholding to [20, 80]. Step 4: bounding box extraction (through 4th–10th slices with two symmetric bounding boxes cropped within both hemispheres ([128: 256, 212:340] and [256: 384, 212:340]) on the 512 × 512 pixelwise CT scan). All pre-processing steps were implemented through fsl interface of package nipype under Python.
