TY - JOUR
T1 - Quantitative comparison of 21 protocols for labeling hippocampal subfields and parahippocampal subregions in in vivo MRI
T2 - Towards a harmonized segmentation protocol
AU - for the Hippocampal Subfields Group (HSG)
AU - Yushkevich, Paul A.
AU - Amaral, Robert S.C.
AU - Augustinack, Jean C.
AU - Bender, Andrew R.
AU - Bernstein, Jeffrey D.
AU - Boccardi, Marina
AU - Bocchetta, Martina
AU - Burggren, Alison C.
AU - Carr, Valerie A.
AU - Chakravarty, M. Mallar
AU - Chételat, Gaël
AU - Daugherty, Ana M.
AU - Davachi, Lila
AU - Ding, Song Lin
AU - Ekstrom, Arne
AU - Geerlings, Mirjam I.
AU - Hassan, Abdul
AU - Huang, Yushan
AU - Iglesias, J. Eugenio
AU - La Joie, Renaud
AU - Kerchner, Geoffrey A.
AU - LaRocque, Karen F.
AU - Libby, Laura A.
AU - Malykhin, Nikolai
AU - Mueller, Susanne G.
AU - Olsen, Rosanna K.
AU - Palombo, Daniela J.
AU - Parekh, Mansi B.
AU - Pluta, John B.
AU - Preston, Alison R.
AU - Pruessner, Jens C.
AU - Ranganath, Charan
AU - Raz, Naftali
AU - Schlichting, Margaret L.
AU - Schoemaker, Dorothee
AU - Singh, Sachi
AU - Stark, Craig E.L.
AU - Suthana, Nanthia
AU - Tompary, Alexa
AU - Turowski, Marta M.
AU - Van Leemput, Koen
AU - Wagner, Anthony D.
AU - Wang, Lei
AU - Winterburn, Julie L.
AU - Wisse, Laura E.M.
AU - Yassa, Michael A.
AU - Zeineh, Michael M.
N1 - Publisher Copyright:
© 2015 Elsevier Inc.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Objective: An increasing number of human in vivo magnetic resonance imaging (MRI) studies have focused on examining the structure and function of the subfields of the hippocampal formation (the dentate gyrus, CA fields 1. -. 3, and the subiculum) and subregions of the parahippocampal gyrus (entorhinal, perirhinal, and parahippocampal cortices). The ability to interpret the results of such studies and to relate them to each other would be improved if a common standard existed for labeling hippocampal subfields and parahippocampal subregions. Currently, research groups label different subsets of structures and use different rules, landmarks, and cues to define their anatomical extents. This paper characterizes, both qualitatively and quantitatively, the variability in the existing manual segmentation protocols for labeling hippocampal and parahippocampal substructures in MRI, with the goal of guiding subsequent work on developing a harmonized substructure segmentation protocol. Method: MRI scans of a single healthy adult human subject were acquired both at 3. T and 7. T. Representatives from 21 research groups applied their respective manual segmentation protocols to the MRI modalities of their choice. The resulting set of 21 segmentations was analyzed in a common anatomical space to quantify similarity and identify areas of agreement. Results: The differences between the 21 protocols include the region within which segmentation is performed, the set of anatomical labels used, and the extents of specific anatomical labels. The greatest overall disagreement among the protocols is at the CA1/subiculum boundary, and disagreement across all structures is greatest in the anterior portion of the hippocampal formation relative to the body and tail. Conclusions: The combined examination of the 21 protocols in the same dataset suggests possible strategies towards developing a harmonized subfield segmentation protocol and facilitates comparison between published studies.
AB - Objective: An increasing number of human in vivo magnetic resonance imaging (MRI) studies have focused on examining the structure and function of the subfields of the hippocampal formation (the dentate gyrus, CA fields 1. -. 3, and the subiculum) and subregions of the parahippocampal gyrus (entorhinal, perirhinal, and parahippocampal cortices). The ability to interpret the results of such studies and to relate them to each other would be improved if a common standard existed for labeling hippocampal subfields and parahippocampal subregions. Currently, research groups label different subsets of structures and use different rules, landmarks, and cues to define their anatomical extents. This paper characterizes, both qualitatively and quantitatively, the variability in the existing manual segmentation protocols for labeling hippocampal and parahippocampal substructures in MRI, with the goal of guiding subsequent work on developing a harmonized substructure segmentation protocol. Method: MRI scans of a single healthy adult human subject were acquired both at 3. T and 7. T. Representatives from 21 research groups applied their respective manual segmentation protocols to the MRI modalities of their choice. The resulting set of 21 segmentations was analyzed in a common anatomical space to quantify similarity and identify areas of agreement. Results: The differences between the 21 protocols include the region within which segmentation is performed, the set of anatomical labels used, and the extents of specific anatomical labels. The greatest overall disagreement among the protocols is at the CA1/subiculum boundary, and disagreement across all structures is greatest in the anterior portion of the hippocampal formation relative to the body and tail. Conclusions: The combined examination of the 21 protocols in the same dataset suggests possible strategies towards developing a harmonized subfield segmentation protocol and facilitates comparison between published studies.
KW - CA1
KW - CA2
KW - CA3
KW - Dentate gyrus
KW - Entorhinal cortex
KW - Hippocampal subfields
KW - Hippocampus
KW - Magnetic resonance imaging
KW - Medial temporal lobe
KW - Parahippocampal gyrus
KW - Perirhinal cortex
KW - Segmentation
KW - Subiculum
KW - Unified protocol
UR - https://www.scopus.com/pages/publications/84939468449
U2 - 10.1016/j.neuroimage.2015.01.004
DO - 10.1016/j.neuroimage.2015.01.004
M3 - Article
C2 - 25596463
AN - SCOPUS:84939468449
SN - 1053-8119
VL - 111
SP - 526
EP - 541
JO - NeuroImage
JF - NeuroImage
ER -