Uncovering early COPD? The T-slope as a novel CT biomarker for evaluating airway narrowing
Bibliographic record
Abstract
Extract From the tracheobronchial tree structure models described by Weibel [1], Horsfield and Cumming [2], and others [3, 4], we know that in the normal lung, the airways follow a branching pattern from the trachea to the distal airways, which locks in a progressive increase in cumulative cross-sectional lumen area. In fact, in the healthy lung, this increase in cross-sectional lumen area is exponential! The small airways, <2 mm in diameter, which can appear as early as the fourth generation of airway branches [5], are believed to be the major site of airflow obstruction in patients with COPD [6]. This insight was based on small airway disease features, including airway narrowing and obliteration, as well as mucus plugging. Using micro-computed tomography (CT) imaging [7], the cross-sectional lumen area of the terminal bronchioles was also shown to be reduced by 99.7% in COPD patients relative to controls. Substantial decreases in the total cross-sectional lumen area in the small airways will necessarily result in deviations from the expected exponential relationship.
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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 | 0.002 | 0.009 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.012 | 0.011 |
| Insufficient payload (model declined to judge) | 0.003 | 0.005 |
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".