Determination of 2-D velocity vectors using color Doppler ultrasound
Why this work is in the frame
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Bibliographic record
Abstract
Color Doppler flow images were obtained from two beam directions, and the velocity vectors in the flow field were computed for each pixel point. The technique was applied to an end-to-side anastomosis model. As expected, the directions of velocity vectors change gradually as flow travels through the anastomosis. Highly skewed velocity profiles along with a stagnant flow region were visualized across the lumen of the host artery. High radial velocity components associated with the secondary flow were clearly revealed about 1-2 diameters downstream from the junction. Based on a single Doppler image, this region with radial flow could be incorrectly integrated as a region with high axial velocities. The vector computation clearly resolved this problem. True velocity magnitudes were then used to create color flow images independent of the Doppler angle.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it