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Updated: Jul 30, 2026
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High-resolution In Vivo Manual Segmentation Protocol for Human Hippocampal Subfields Using 3T Magnetic Resonance Imaging
Published on: November 10, 2015
In vivo neuropathology of the hippocampal formation in AD: a radial mapping MR-based study
G B Frisoni1, F Sabattoli, A D Lee
1LENITEM Laboratory of Epidemiology Neuroimaging and Telemedicine, IRCCS Centro S. Giovanni di Dio-FBF, via Pilastroni 4, 25125 Brescia, Italy. gfrisoni@fatebenefratelli.it
Neuroimage
|April 25, 2006
Summary
Alzheimer's disease (AD) causes significant tissue loss in the CA1 field and subiculum of the hippocampus. Advanced MRI techniques reveal these structural changes in vivo, sparing the CA2-3 fields.
Area of Science:
- Neuroimaging
- Neuropathology
- Alzheimer's Disease Research
Background:
- Alzheimer's disease (AD) is characterized by learning deficits linked to hippocampal formation involvement.
- AD pathology, including plaques and tangles, disproportionately affects the CA1 field and subiculum within the hippocampus.
- Understanding in vivo structural changes in the hippocampus is crucial for diagnosing and managing AD.
Purpose of the Study:
- To identify and quantify in vivo structural changes within the hippocampal formation in patients with mild to moderate Alzheimer's disease.
- To correlate in vivo imaging findings with known neuropathological patterns in Alzheimer's disease.
- To assess the utility of high-resolution MRI in detecting macroscopic neuropathology of the hippocampus.
Main Methods:
- High-resolution T1-weighted MRI scans were acquired from 28 Alzheimer's disease patients and 40 cognitively intact controls.
- The hippocampal formation, including the hippocampus proper and subiculum, was manually segmented across 35 coronal slices.
- Three-dimensional parametric surface mesh models and custom algorithms were used to assess group differences in hippocampal structure.
Main Results:
- Significant atrophy, with tissue loss exceeding 20%, was observed in the CA1 field and parts of the subiculum in AD patients.
- The CA2-3 fields of the hippocampal formation showed remarkable preservation in Alzheimer's disease patients.
- These in vivo findings align with established neuropathological patterns of Alzheimer's disease.
Conclusions:
- In vivo MRI can detect significant, regionally specific atrophy within the hippocampal formation in Alzheimer's disease patients.
- The observed pattern of hippocampal atrophy in AD patients (CA1 and subiculum affected, CA2-3 spared) supports pathological findings.
- This study demonstrates the potential of MRI for in vivo macroscopic neuropathological assessment of the hippocampus in neurodegenerative dementias.
