• Giovanni B Frisoni, Clifford R Jack, Martina Bocchetta, Corinna Bauer, Kristian S Frederiksen, Yawu Liu, Gregory Preboske, Tim Swihart, Melanie Blair, Enrica Cavedo, Michel J Grothe, Mariangela Lanfredi, Oliver Martinez, Masami Nishikawa, Marileen Portegies, Travis Stoub, Chadwich Ward, Liana G Apostolova, Rossana Ganzola, Dominik Wolf, Frederik Barkhof, George Bartzokis, Charles DeCarli, John G Csernansky, Leyla deToledo-Morrell, Mirjam I Geerlings, Jeffrey Kaye, Ronald J Killiany, Stephane Lehéricy, Hiroshi Matsuda, John O'Brien, Lisa C Silbert, Philip Scheltens, Hilkka Soininen, Stefan Teipel, Gunhild Waldemar, Andreas Fellgiebel, Josephine Barnes, Michael Firbank, Lotte Gerritsen, Wouter Henneman, Nikolai Malykhin, Jens C Pruessner, Lei Wang, Craig Watson, Henrike Wolf, Mony deLeon, Johannes Pantel, Clarissa Ferrari, Paolo Bosco, Patrizio Pasqualetti, Simon Duchesne, Henri Duvernoy, Marina Boccardi, and EADC-ADNI Working Group on The Harmonized Protocol for Manual Hippocampal Volumetry and for the Alzheimer's Disease Neuroimaging Initiative.
• LENITEM (Laboratory of Epidemiology, Neuroimaging and Telemedicine) IRCCS - Istituto Centro S. Giovanni di Dio - Fatebenefratelli, Brescia, Italy; Memory Clinic and LANVIE - Laboratory of Neuroimaging of Aging, University Hospitals and University of Geneva, Geneva, Switzerland.
• Alzheimers Dement. 2015 Feb 1;11(2):111-25.

BackgroundAn international Delphi panel has defined a harmonized protocol (HarP) for the manual segmentation of the hippocampus on MR. The aim of this study is to study the concurrent validity of the HarP toward local protocols, and its major sources of variance.MethodsFourteen tracers segmented 10 Alzheimer's Disease Neuroimaging Initiative (ADNI) cases scanned at 1.5 T and 3T following local protocols, qualified for segmentation based on the HarP through a standard web-platform and resegmented following the HarP. The five most accurate tracers followed the HarP to segment 15 ADNI cases acquired at three time points on both 1.5 T and 3T.ResultsThe agreement among tracers was relatively low with the local protocols (absolute left/right ICC 0.44/0.43) and much higher with the HarP (absolute left/right ICC 0.88/0.89). On the larger set of 15 cases, the HarP agreement within (left/right ICC range: 0.94/0.95 to 0.99/0.99) and among tracers (left/right ICC range: 0.89/0.90) was very high. The volume variance due to different tracers was 0.9% of the total, comparing favorably to variance due to scanner manufacturer (1.2), atrophy rates (3.5), hemispheric asymmetry (3.7), field strength (4.4), and significantly smaller than the variance due to atrophy (33.5%, P < .001), and physiological variability (49.2%, P < .001).ConclusionsThe HarP has high measurement stability compared with local segmentation protocols, and good reproducibility within and among human tracers. Hippocampi segmented with the HarP can be used as a reference for the qualification of human tracers and automated segmentation algorithms.Copyright © 2015 The Alzheimer's Association. Published by Elsevier Inc. All rights reserved.

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