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The Canadian Dementia Imaging Protocol: Harmonizing National Cohorts
Author(s) -
Duchesne Simon,
Chouinard Isabelle,
Potvin Olivier,
Fonov Vladimir S.,
Khademi April,
Bartha Robert,
Bellec Pierre,
Collins D. Louis,
Descoteaux Maxime,
Hoge Rick,
McCreary Cheryl R.,
Ramirez Joel,
Scott Christopher J.M.,
Smith Eric E.,
Strother Stephen C.,
Black Sandra E.
Publication year - 2019
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.26197
Subject(s) - nuclear medicine , medicine , imaging phantom , dementia , fluid attenuated inversion recovery , protocol (science) , psychology , magnetic resonance imaging , radiology , pathology , disease , alternative medicine
Background Harmonized protocols to collect imaging data must be devised, employed, and maintained in multicentric studies to reduce interscanner variability in subsequent analyses. Purpose To present a standardized protocol for multicentric research on dementia linked to neurodegeneration in aging, harmonized on all three major vendor platforms. The protocol includes a common procedure for qualification, quality control, and quality assurance and feasibility in large‐scale studies. Study Type Prospective. Subjects The study involved a geometric phantom, a single individual volunteer, and 143 cognitively healthy, mild cognitively impaired, and Alzheimer's disease participants in a large‐scale, multicentric study. Field Strength/Sequences MRI was perform with 3T scanners (GE, Philips, Siemens) and included 3D T 1 w, PD/T 2 w,T 2 * , T 2 w‐FLAIR, diffusion, and BOLD resting state acquisitions. Assessment Measures included signal‐ and contrast‐to‐noise ratios (SNR and CNR, respectively), total brain volumes, and total scan time. Statistical Tests SNR, CNR, and scan time were compared between scanner vendors using analysis of variance (ANOVA) and Tukey tests, while brain volumes were tested using linear mixed models. Results Geometric phantom T 1 w SNR was significantly ( P < 0.001) higher in Philips (mean: 71.4) than Siemens (29.5), while no significant difference was observed between vendors for T 2 w (32.0 and 37.2, respectively, P = 0.243). Single individual volunteer T 1 w CNR was higher in subcortical regions for Siemens ( P < 0.001), while Philips had higher cortical CNR ( P = 0.044). No significant difference in brain volumes was observed between vendors ( P = 0.310/0.582/0.055). The average scan time was 41.0 minutes (SD: 2.8) and was not significantly different between sites ( P = 0.071) and cognitive groups ( P = 0.853). Data Conclusion The harmonized Canadian Dementia Imaging Protocol suits the needs of studies that need to ensure quality MRI data acquisition for the measurement of brain changes across adulthood, due to aging, neurodegeneration, and other etiologies. A detailed description, exam cards, and operators' manual are freely available at the following site: www.cdip-pcid.ca . Level of Evidence: 2 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2019;49:456–465.