Abstract:
:Hemispheric asymmetry of hippocampal volume is a common finding that has biological relevance, including associations with dementia and cognitive performance. However, a recent study has reported the possibility of systematic error in measurements of hippocampal asymmetry by magnetic resonance volumetry. We manually traced the volumes of the anterior and posterior hippocampus in 40 healthy people to measure systematic error related to image orientation. We found a bias due to the side of the screen on which the hippocampus was viewed, such that hippocampal volume was larger when traced on the left side of the screen than when traced on the right (p = 0.05). However, this bias was smaller than the anatomical right > left asymmetry of the anterior hippocampus. We found right > left asymmetry of hippocampal volume regardless of image presentation (radiological versus neurological). We conclude that manual segmentation protocols can minimize the effect of image orientation in the study of hippocampal volume asymmetry, but our confirmation that such bias exists suggests strategies to avoid it in future studies.
journal_name
Front Neuroscijournal_title
Frontiers in neuroscienceauthors
Rogers BP,Sheffield JM,Luksik AS,Heckers Sdoi
10.3389/fnins.2012.00179subject
Has Abstractpub_date
2012-12-13 00:00:00pages
179eissn
1662-4548issn
1662-453Xjournal_volume
6pub_type
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