Three-dimensional deformation-based hippocampal surface anatomy, projected on MRI images

Area of Science:

• Neuroimaging
• Anatomy
• Medical Imaging

Background:

• Accurate visualization of hippocampal anatomy is crucial for understanding neurological conditions.
• Traditional 2D MRI slices can limit the comprehensive understanding of complex 3D structures like the hippocampus.

Purpose of the Study:

• To illustrate the three-dimensional (3D) surface anatomy of the hippocampus.
• To demonstrate the utility of deformation-based composite segmentations superimposed on 2D MRI.
• To highlight the relationship of the hippocampus to surrounding structures.

Main Methods:

• Segmentation of hippocampi from five normal volumetric MRI studies using a semiautomated, deformation-based technique.
• Processing segmentations to create composite (average) hippocampal surfaces for left and right hippocampi.
• Projecting composite hippocampal surfaces onto 2D MRI scans in standard and oblique planes, verified with 3D coordinate data.

Main Results:

• Composite hippocampal surfaces revealed detailed anatomical features, including the pes hippocampi, intralimbic gyrus, and uncinate gyrus.
• Projection onto 2D MRI effectively defined hippocampal anatomy in relation to adjacent structures.
• The composite images highlighted normal hippocampal surface anatomy and its structural context on MRI.

Conclusions:

• Deformation-based composite segmentations provide a detailed 3D visualization of hippocampal surface anatomy.
• Superimposing these composite surfaces onto 2D MRI aids in understanding the hippocampus's anatomical relationships.
• This technique enhances the depiction of normal hippocampal morphology and its surrounding structures in MRI studies.