Fig. 1
From: Volume gain of periaqueductal gray in medication-overuse headache
The flow chart of PAG template and individual PAG segmentation. Top line: PAG template was created using MRIcron software based standard MNI template (left 3 columns); Bottom line: Individual PAG segment was performed using New segment tool (SPM8 software) and then applied the generated deformation field to PAG template to generate individual PAG. Red and blue represent 3D visualization of PAG template and individual PAG