Fig. 2.

Anatomical variation and cross-sectional overlap between patients.The relationship between each individual anatomical model and the whole patient group and anatomic atlas is presented. Each individual ANT model (one to eight) is demonstrated in the AC–PC coordinate system. The colors represent the degree of overlap (from 1–7) with the whole patient group, thus illustrating the deviation of a particular patient from the whole patient group. The vertical dashed line in sagittal ANT models represents the level of the coronal ANT model in y-axis. Since the coronal models were delineated from STIR image slices visualizing the mammillothalamic tract, the line also illustrates the anatomical relationship between the junction of mammillothalamic tract and ANT in individual patients. In the lower part of the image, the degree of overlap is presented in the whole patient group together with delineation of ANT in the Schaltenbrand atlas (dashed outlines). The data demonstrate that ANT was located more laterally, superiorly and anteriorly in 3 T MRI in this patient group compared to the anatomical atlas.