Reproducibility of advanced MR measures across all 3 major scanner vendors in a longitudinal 5-site multiple sclerosis study
Bibliographic record
Abstract
Motivation: Advanced brain and spinal cord MRI is being collected in the Canadian prospective cohort study to understand progression in multiple sclerosis (CanProCo). Reproducibility was investigated in healthy controls. Goal(s): Determine reproducibility of brain volumetrics, myelin water fraction, magnetisation transfer ratio, diffusion tensor imaging metrics and spinal cord area across sites. Approach: 52 healthy controls were scanned at year 0 and 1 at a 3T site (2 Siemens, 2 Philips, 1 GE). Reproducibility was assessed using intraclass correlation coefficients, Bland-Altman plots and coefficients of variation. Results: Variability in most MR metrics was similar between sites although values themselves differed for a few metrics. Impact: CanProCo is a Canada-wide study collecting advanced brain and spinal cord MRI. Reproducibility of healthy control data was assessed to enable interpretation of longitudinal multi-site multiple sclerosis data. Variability in most MR metrics over 1 year was similar between sites.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.013 | 0.016 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".