Radiographic Imaging Requirements following Ventriculoperitoneal Shunt Procedures
Bibliographic record
Abstract
The requirements for radiographic imaging of the ventricles after a ventricular shunt procedure are not well defined. At British Columbia's Children's Hospital, the standard protocol included an ultrasound examination or CT scan at 6-8 weeks postoperatively, and a delayed CT scan at 6 months to 2 years, with additional scans only if the patient had symptoms of shunt malfunction. This study was performed to determine if the delayed scan could be omitted without compromising patient care. The study comprised 86 children with ventriculoperitoneal shunt operations, who had early CT scans or ultrasound examinations less than 20 weeks postoperatively, delayed postoperative CT scans between 20 weeks and 2 years, and who were asymptomatic at the time of these radiographic studies. In 39 of the 86 patients a change in ventricular size occurred between the early and delayed imaging studies, and in these patients the delayed scan was felt to be required. In patients in whom the early imaging study was done at more than 12 weeks postoperatively, and probably in patients with small ventricles preoperatively, there was no added information gained by doing a delayed scan. It is concluded that a radiographic examination of ventricular size at 12 weeks after a shunt operation may provide an adequate baseline study. If the early postoperative radiographic study is done less than 12 weeks after surgery, we would advise that in asymptomatic patients, with the exception of patients with very small ventricles preoperatively, a CT scan be repeated at a later date to obtain an appropriate baseline assessment of ventricular size for the future.
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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 | 0.024 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".