Magnetic resonance imaging study of extracellular fluid tracer movement in brains of immature rats with hydrocephalus
Bibliographic record
Abstract
Hydrocephalus is associated with brain compression and accumulation of neurotransmitter waste products in the brain and cerebrospinal fluid. We postulated that the extracellular compartment is compressed and specifically hypothesized that extracellular fluid tracer movement through brain would differ between control and hydrocephalic rats. Gadolinium diethylenetriamine pentaacetic acid (Gd-DTPA) was injected into the cerebral cortex of 4-week-old rats, 7-11 days after induction of hydrocephalus by kaolin injection into the cisterna magna. The movement of this soluble paramagnetic compound was followed over successive timed intervals from 20 min to 180 min with T1-weighted magnetic resonance imaging. Non-hydrocephalic controls exhibited greater spread of the tracer and greater change in T1-weighted signal intensity in the ipsilateral cortex than hydrocephalic animals. Hydrocephalic animals exhibited preferential accumulation of tracer in edematous white matter. Gd-DTPA penetrated the lateral ventricles within 30 min in both control and hydrocephalic rats. The results suggest that there is a relative impairment of extracellular fluid movement through the cerebral cortex of young hydrocephalic rats.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".