CreateMask

Purpose. Produce a binary brain mask from perfusion images using simple intensity thresholding.

Inputs

• For each ASL base name {asl}, reads derivatives/<sub>/perf/srmean{asl}.nii.

Outputs & filenames

• Writes derivatives/<sub>/perf/{asl}_mask_perf_cbf.nii (int16).

Configuration

Key	Type / Default	Meaning
thres	float / 0.1	Threshold as a fraction of the image max

YAML example

modules:
  - name: CreateMask
    config:
      thres: 0.15