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. 2019 Jun 13:11:439-449.
doi: 10.1016/j.dadm.2019.04.001. eCollection 2019 Dec.

Progress update from the hippocampal subfields group

Affiliations

Progress update from the hippocampal subfields group

Rosanna K Olsen et al. Alzheimers Dement (Amst). .

Abstract

Introduction: Heterogeneity of segmentation protocols for medial temporal lobe regions and hippocampal subfields on in vivo magnetic resonance imaging hinders the ability to integrate findings across studies. We aim to develop a harmonized protocol based on expert consensus and histological evidence.

Methods: Our international working group, funded by the EU Joint Programme-Neurodegenerative Disease Research (JPND), is working toward the production of a reliable, validated, harmonized protocol for segmentation of medial temporal lobe regions. The working group uses a novel postmortem data set and online consensus procedures to ensure validity and facilitate adoption.

Results: This progress report describes the initial results and milestones that we have achieved to date, including the development of a draft protocol and results from the initial reliability tests and consensus procedures.

Discussion: A harmonized protocol will enable the standardization of segmentation methods across laboratories interested in medial temporal lobe research worldwide.

Keywords: Cytoarchitecture; Hippocampus; Histology; Human; Neuroanatomy; Neuroimaging; Structural imaging; Volumetry; ex vivo.

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Figures

Fig. 1
Fig. 1
(A) Map highlighting the global membership of the HSG. Over 200 members from 18 countries are currently in the HSG. (B) Workflow procedure for the HSG. Abbreviations: HSG, Hippocampal Subfield Group.
Fig. 2
Fig. 2
(A) Examples of the variability in the position of the CA1, subiculum/prosubiculum boundary (white line) across three different segmentation protocols overlaid on the same brain (adapted from Yushkevich et al., 2015, Fig. 3). This variability is likely due to differences in reference atlases. (B) Histological and MRI slices of the human hippocampal formation depicting the body (upper) and head (lower) regions. Note that the subfield anatomy in the body and head differ in composition and organization relative to macroscopic features. Abbreviations: FD, fascia dentata (dentate gyrus); Ent, entorhinal cortex; JC, La Joie, Chetalat protocol; OAP, Olsen, Amaral, Palombo protocol; PreS, presubiculum; ProS, prosubiculum; Sub, subiculum; WG, Wisse, Geerlings protocol.
Fig. 3
Fig. 3
The same single histological slice of the hippocampal body stained with Kluver-Barrera stain, segmented by three different neuroanatomists. Abbreviations: DG/FD, dentate gyrus/fascia dentata; ProS, prosubiculum; PreS, presubiculum; PaS/ParaS, parasubiculum; S/Sub, subiculum.
Fig. 4
Fig. 4
Hippocampal head displaying the uncus in both hemispheres. (A2) Slice showing the disappearance of the uncus in the left hemisphere, and as such, the anterior-most slice of the hippocampal body in the left hemisphere. (B1) Final posterior slice of the hippocampal body displaying the colliculi, the crus fornix, and the “tear drop” shape of the hippocampal body. (B2) Colliculi are no longer visualized, and as such this slice is considered the first slice of the hippocampal tail. (C) Sagittal view, illustrating the anterior and posterior limits of the inclusive hippocampal body range. All images are T2-weighted, resolution 0.39 × 0.39 × 2 mm. (D) Screenshot from the online questionnaire used to reach consensus on the outer boundaries of the hippocampal body.

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