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Body size and intracranial volume interact with the structure of the central nervous system: A multi-center in vivo neuroimaging study

. 2025 ; 3 () : . [epub] 20250507

Status PubMed-not-MEDLINE Language English Country United States Media electronic-ecollection

Document type Journal Article

Grant support
P41 EB027061 NIBIB NIH HHS - United States
R00 EB016689 NIBIB NIH HHS - United States
K23 NS104211 NINDS NIH HHS - United States
P30 NS076408 NINDS NIH HHS - United States
R01 NS133305 NINDS NIH HHS - United States
R61 NS118651 NINDS NIH HHS - United States
R01 NS128478 NINDS NIH HHS - United States
R21 EB031211 NIBIB NIH HHS - United States
R01 NS109450 NINDS NIH HHS - United States
K24 NS126781 NINDS NIH HHS - United States
K01 EB030039 NIBIB NIH HHS - United States
R03 NS139000 NINDS NIH HHS - United States
K01 NS105160 NINDS NIH HHS - United States
L30 NS108301 NINDS NIH HHS - United States
R01 NS109114 NINDS NIH HHS - United States
R01 EB027779 NIBIB NIH HHS - United States

Clinical research emphasizes the implementation of rigorous and reproducible study designs that rely on between-group matching or controlling for sources of biological variation such as subject's sex and age. However, corrections for body size (i.e., height and weight) are mostly lacking in clinical neuroimaging designs. This study investigates the importance of body size parameters in their relationship with spinal cord (SC) and brain magnetic resonance imaging (MRI) metrics. Data were derived from a cosmopolitan population of 267 healthy human adults (age 30.1 ± 6.6 years old, 125 females). We show that body height correlates with brain gray matter (GM) volume, cortical GM volume, total cerebellar volume, brainstem volume, and cross-sectional area (CSA) of cervical SC white matter (CSA-WM; 0.44 ≤ r ≤ 0.62). Intracranial volume (ICV) correlates with body height (r = 0.46) and the brain volumes and CSA-WM (0.37 ≤ r ≤ 0.77). In comparison, age correlates with cortical GM volume, precentral GM volume, and cortical thickness (-0.21 ≥ r ≥ -0.27). Body weight correlates with magnetization transfer ratio in the SC WM, dorsal columns, and lateral corticospinal tracts (-0.20 ≥ r ≥ -0.23). Body weight further correlates with the mean diffusivity derived from diffusion tensor imaging (DTI) in SC WM (r = -0.20) and dorsal columns (-0.21), but only in males. CSA-WM correlates with brain volumes (0.39 ≤ r ≤ 0.64), and with precentral gyrus thickness and DTI-based fractional anisotropy in SC dorsal columns and SC lateral corticospinal tracts (-0.22 ≥ r ≥ -0.25). Linear mixture of age, sex, or sex and age, explained 2 ± 2%, 24 ± 10%, or 26 ± 10%, of data variance in brain volumetry and SC CSA. The amount of explained variance increased to 33 ± 11%, 41 ± 17%, or 46 ± 17%, when body height, ICV, or body height and ICV were added into the mixture model. In females, the explained variances halved suggesting another unidentified biological factor(s) determining females' central nervous system (CNS) morphology. In conclusion, body size and ICV are significant biological variables. Along with sex and age, body size should therefore be included as a mandatory variable in the design of clinical neuroimaging studies examining SC and brain structure; and body size and ICV should be considered as covariates in statistical analyses. Normalization of different brain regions with ICV diminishes their correlations with body size, but simultaneously amplifies ICV-related variance (r = 0.72 ± 0.07) and suppresses volume variance of the different brain regions (r = 0.12 ± 0.19) in the normalized measurements.

1st Department of Neurology St Anne's University Hospital and Medical Faculty of Masaryk University Brno Czech Republic

Advanced Imaging and Artificial Intelligence Center Neuroradiology Department IRCCS Mondino Foundation Pavia Italy

Aix Marseille Univ CNRS CRMBM Marseille France

APHM Hopital Universitaire Timone CEMEREM Marseille France

Athinoula A Martinos Center for Biomedical Imaging Department of Radiology Massachusetts General Hospital Charlestown MA United States

Biomedical Engineering and Imaging Institute Department of Radiology Graduate School of Biomedical Sciences Icahn School of Medicine at Mount Sinai New York NY United States

Canon Medical Systems srl Rome Italy

Cardiff University Brain Research Imaging Centre School of Psychology Cardiff University Cardiff Wales United Kingdom

CAS Key Laboratory of Behavioral Science Institute of Psychology Chinese Academy of Science Beijing China

Center for Magnetic Resonance Research Department of Radiology University of Minnesota Minneapolis MN United States

Centre de recherche du CHU Sainte Justine Université de Montréal Montreal QC Canada

Centre for Advanced Imaging Australian Institute for Bioengineering and Nanotechnology The University of Queensland St Lucia Australia

Centre for Human Brain Health University of Birmingham Birmingham United Kingdom

Centre for Medical Image Computing University College London London United Kingdom

Centre of Precision Rehabilitation for Spinal Pain University of Birmingham Birmingham United Kingdom

Clement J Zablocki Veteran's Affairs Medical Center Milwaukee WI United States

CREF Museo storico della fisica e Centro studi e ricerche Enrico Fermi Rome Italy

Department for Systems Neuroscience University Medical Center Hamburg Eppendorf Hamburg Germany

Department of Biomedical Engineering Vanderbilt University Nashville TN United States

Department of Biomedical Sciences Humanitas University Pieve Emanuele Italy

Department of Biophysics Faculty of Medicine Masaryk University Brno Czech Republic

Department of Brain and Behavioural Sciences University of Pavia Pavia Italy

Department of Computer Engineering and Software Engineering Polytechnique Montreal Montreal QC Canada

Department of Neurological Surgery University of California Davis CA United States

Department of Neurology Faculty of Medicine and Dentistry Palacký University Olomouc Olomouc Czech Republic

Department of Neurology UCSF Weill Institute for Neurosciences University of California San Francisco San Francisco CA United States

Department of Neurology University Hospital Brno Brno Czech Republic

Department of Neurophysics Max Planck Institute for Human Cognitive and Brain Sciences Leipzig Germany

Department of Neurosciences Imaging and Clinical Sciences 'G D'Annunzio' University of Chieti Pescara Chieti Italy

Department of Neurosurgery Faculty of Medicine and Dentistry Palacký University Olomouc Olomouc Czech Republic

Department of Neurosurgery Medical College of Wisconsin Milwaukee WI United States

Department of Neurosurgery University of Oklahoma Oklahoma City OK United States

Department of Pathology and Laboratory Medicine University of British Columbia Vancouver BC Canada

Department of Physics and Astronomy University of British Columbia Vancouver BC Canada

Department of Psychiatry Baylor College of Medicine Houston TX United States

Department of Psychology University of Chinese Academy of Sciences Beijing China

Department of Radiology and Medical Informatics Faculty of Medicine University of Geneva Geneva Switzerland

Department of Radiology and Nuclear Medicine University Hospital Brno and Masaryk University Brno Czech Republic

Department of Radiology and Radiological Sciences Vanderbilt University Medical Center Nashville TN United States

Department of Radiology Baylor College of Medicine Houston TX United States

Department of Radiology Beijing Tiantan Hospital Capital Medical University Beijing China

Department of Radiology Faculty of Medicine University of British Columbia Vancouver BC Canada

Department of Radiology Juntendo University School of Medicine Bunkyo Tokyo Japan

Department of Radiology Northwestern University Chicago IL United States

Department of Radiology Swiss Paraplegic Centre Nottwil Switzerland

Department of Radiology Toho University Omori Medical Center Tokyo Japan

Division of Clinical Behavioral Neuroscience Department of Pediatrics Masonic Institute for the Developing Brain University of Minnesota Minneapolis MN United States

Division of Neurology Faculty of Medicine University of British Columbia Vancouver BC Canada

Division of Pain Medicine Department of Anesthesiology Perioperative and Pain Medicine Stanford University School of Medicine Palo Alto CA United States

e Health Center Universitat Oberta de Catalunya Barcelona Spain

Faculty of Medicine Masaryk University Brno Czech Republic

Felix Bloch Institute for Solid State Physics Faculty of Physics and Earth System Sciences Leipzig University Leipzig Germany

Fondation Campus Biotech Geneva Genève Switzerland

Functional Neuroimaging Unit CRIUGM University of Montreal Montreal Canada

Harvard Massachusetts Institute of Technology Health Sciences and Technology Cambridge MA United States

Harvard Medical School Boston MA United States

IBM Poland Department of Content Design Cracow Poland

Institute for Advanced Biomedical Technologies 'G D'Annunzio' University of Chieti Pescara Chieti Italy

Institute for Mental Health University of Birmingham Birmingham United Kingdom

Institute of Diagnostic and Interventional Neuroradiology Faculty of Medicine and Carl Gustav Carus University Hospital Technische Universität Dresden Dresden Germany

Institute of Nanotechnology CNR Rome Italy

International Collaboration on Repair Discoveries University of British Columbia Vancouver BC Canada

IRCCS Santa Lucia Foundation Neuroimaging Laboratory Rome Italy

Max Planck Research Group Pain Perception Max Planck Institute for Human Cognitive and Brain Sciences Leipzig Germany

McConnell Brain Imaging Centre Montreal Neurological Institute McGill University Montreal QC Canada

Mila Quebec AI Institute Montreal QC Canada

MR Clinical Science Philips Healthcare Canada Mississauga Canada

Multimodal and Functional Imaging Laboratory Central European Institute of Technology Brno Czech Republic

Neuro 10 Institute Ecole polytechnique fédérale de Lausanne Geneva Switzerland

Neuroimmunology and Multiple Sclerosis Unit Laboratory of Advanced Imaging in Neuroimmunological Diseases Hospital Clínic Barcelona Fundació de Recerca Clínic Barcelona IDIBAPS and Universitat de Barcelona Barcelona Spain

NeuroPoly Lab Institute of Biomedical Engineering Polytechnique Montreal Montreal QC Canada

Neuroradiology Unit IRCCS Humanitas Research Hospital Rozzano Italy

NMR Research Unit Queen Square Multiple Sclerosis Centre Department of Neuroinflammation Queen Square Institute of Neurology Faculty of Brain Sciences University College London London United Kingdom

School of Biomedical Sciences Faculty of Health Medicine and Behavioural Sciences The University of Queensland Brisbane Australia

School of Electrical Engineering and Computer Science The University of Queensland St Lucia Australia

Section of Neuroradiology Department of Radiology Hospital Universitari Vall d'Hebron Barcelona Spain

Sherbrooke Connectivity Imaging Lab Computer Science department Université de Sherbrooke Sherbrooke QC Canada

Spinal Cord Injury Center Balgrist University Hospital Zurich University of Zurich Zurich Switzerland

Stanford University Stanford CA United States

The University of Tokyo Hospital Radiology Center Tokyo Japan

Université de Strasbourg CNRS ICube Strasbourg France

Vall d'Hebron Institute of Oncology Vall d'Hebron Barcelona Hospital Campus Barcelona Spain

Vanderbilt University Institute of Imaging Science Vanderbilt University Medical Center Nashville TN United States

Wellcome Centre for Human Neuroimaging Queen Square Institute of Neurology University College London London United Kingdom

Wellcome Centre For Integrative Neuroimaging FMRIB Nuffield Department of Clinical Neurosciences University of Oxford Oxford United Kingdom

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