Abstract
Automated neuroimaging methods like FreeSurfer (https://surfer.nmr.mgh.harvard.edu/) have revolutionized quantitative neuroimaging analyses. Such analyses provide a variety of metrics used for image quantification, including magnetic resonance imaging (MRI) volumetrics. With the release of FreeSurfer version 6.0, it is important to assess its comparability to the widely-used previous version 5.3. The current study used data from the initial 249 participants in the ongoing Chronic Effects of Neurotrauma Consortium (CENC) multicenter observational study to compare the volumetric output of versions 5.3 and 6.0 across various regions of interest (ROI). In the current investigation, the following ROIs were examined: total intracranial volume, total white matter volume, total ventricular volume, total gray matter volume, and right and left volumes for the thalamus, pallidum, putamen, caudate, amygdala and hippocampus. Absolute ROI volumes derived from FreeSurfer 6.0 differed significantly from those obtained using version 5.3. We also employed a clinically-based evaluation strategy to compare both versions in their prediction of age-mediated volume reductions (or ventricular increase) in the aforementioned structures. Statistical comparison involved both general linear modeling (GLM) and random forest (RF) methods, where cross-validation error was significantly higher using segmentations from FreeSurfer version 5.3 versus version 6.0 (GLM: t = 4.97, df = 99, p value = 2.706e-06; RF: t = 4.85, df = 99, p value = 4.424e-06). Additionally, the relative importance of ROIs used to predict age using RFs differed between FreeSurfer versions, indicating substantial differences in the two versions. However, from the perspective of correlational analyses, fitted regression lines and their slopes were similar between the two versions, regardless of version used. While absolute volumes are not interchangeable between version 5.3 and 6.0, ROI correlational analyses appear to yield similar results, suggesting the interchangeability of ROI volume for correlational studies.
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Acknowledgements
The CENC Observational Study Site PIs or co-PIs also include: Heather Belanger PhD (Tampa), Carlos Jaramillo MD (San Antonio), Ajit Pai MD (Richmond), Heechin Chae MD (Fort Belvoir), Terri Pogoda PhD (Boston), Scott Sponheim PhD (Minneapolis), and Kathleen Carlson PhD (Portland). We also acknowledge the efforts of the entire CENC Observational Study Leadership Working Group and Core Team members who, besides the authors, also include: Justin Alicea, Jessica Berumen, Cody Blankenship, Jennifer Boyce, Linda Brunson, Katrina Burson, Julia Christensen, Margaret Clarke, Doreen Collins, Sureyya Dikmen, Esra Doud, Connie Duncan, Stephanie Edmunds, Robyn Endsley, Elizabeth Fogleman, Laura M. Franke, Katelyn Gormley, Brenda Hair, Jim Henry, Nancy Hsu, Cheryl Ford-Smith, George Gitchel, Col. Sidney Hinds (Consortium Co-PI), Caitlin Jones, Kimbra Kenney, Sunchai Khemalaap, Valerie Larson, Tiffany Lewis, Scott McDonald, Tamara McKenzie-Hartman, Frank Mierzwa, Alison Molitor, Joe Montanari, Johnnie Mortenson, Nicholas Pastorek, Judy Pulliam, Risa Richardson, Callie Riggs, Rachel Rosenfield, Sara Salkind, James K. Sickinger, Taylor Swankie, Nancy Temkin, Doug Theriaque, Maya Troyanskaya, Rodney Vanderploeg, and Carmen Vasquez.
Additionally, we wish to acknowledge additional members of the CENC Neuroimaging Core including: Marlene Diaz, Carlo Pierpaoli, Amritha Nayak, Carmen Velez, Gerald E. York, Jennifer Nathan, Rajan Agarwal, Timothy Duncan, Michael Lennon, Aaron M. Betts, Jorge De Villasante, Robert Cadrain, Garrett Black, Naomi J. Goodrich-Hunsaker, Zili D. Chu, and Rhonda O’Donovan.
Finally, we extend our gratitude to the participants and family members of the Chronic Effects of Neurotrauma Consortium.
Funding
This material is based in part upon work supported by the U.S. Army Medical Research and Material Command and from the U.S. Department of Veterans Affairs Chronic Effects of Neurotrauma Consortium under Award No. W81XWH-13-2-0095 and the CENC Neuroimaging Core under 1I01RX001062. The U.S. Army Medical Research Acquisition Activity, 820 Chandler Street, Fort Detrick MD 21702–5014 is the awarding and administering acquisition office. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the U.S. Government, or the U.S. Department of Veterans Affairs, and no official endorsement should be inferred. Dr. Bigler received royalties from Oxford University Press, and honorarium from the American Psychological Association for editorial work and, during the time of this investigation, directed the Neuropsychological Assessment and Research Lab at Brigham Young University, which did provide forensic consultation.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. Institutional review board (IRB) approval was obtained across all participating intuitions and for all phases of the study.
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Bigler, E.D., Skiles, M., Wade, B.S.C. et al. FreeSurfer 5.3 versus 6.0: are volumes comparable? A Chronic Effects of Neurotrauma Consortium study. Brain Imaging and Behavior 14, 1318–1327 (2020). https://doi.org/10.1007/s11682-018-9994-x
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DOI: https://doi.org/10.1007/s11682-018-9994-x