Fig. 3From: Oxygen extraction fraction is not uniform in human brain: a positron emission tomography studyAveraged gray and white matter images extracted from anatomically standardized MR images. All images are transaxial sections parallel to the anterior–posterior commissure (AC–PC) line. The slice positions are − 40, − 20, 0, 8, 24 and 40 mm from the AC–PC lineBack to article page