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PMC full text:
Int J Radiat Oncol Biol Phys. Author manuscript; available in PMC 2011 Nov 15.
Published in final edited form as:
Int J Radiat Oncol Biol Phys. 2010 Nov 15; 78(4): 1244–1252.
doi:  10.1016/j.ijrobp.2010.01.039

Figure 1

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Hippocampal contouring

The hippocampus (orange) was contoured on T1-weighted MRI axial sequences. Given the preponderance of gray matter in the hippocampus, contouring focused on the T1-hypointense signal medial to the temporal horn and distinct from the T1-hyperintense parahippocampal gyrus (A) and fimbriae (D), located inferomedial and superomedial to the hippocampus, respectively. Contouring began at the most caudal extent of the crescentic-shaped floor of the temporal horn (B) and continued postero-cranially along the medial edge of the temporal horn. The medial border of the hippocampus was delineated by the edge of the T1-hypointensity up to the ambient cistern (C). The uncal recess (E) of the temporal horn served to distinguish the hippocampus from the gray matter of the amygdala (F), lying anterior and superior to the hippocampus. The postero-cranial extent of the hippocampus was defined by the curvilinear T1-hypointense hippocampal tail located just antero-medially to the atrium of the lateral ventricle (G). Contours terminated at the lateral edges of the quadrageminal cisterns (H), prior to the emergence of the crus of the fornix.

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