An improved spread-spectrum method for high-frame-rate color Doppler ultrasound imaging
Bibliographic record
Abstract
Ultrasound plane-wave imaging is desirable for its ability to achieve high frame rates, allowing the capture of fast dynamic events and continuous Doppler data. In most implementations, multiple low-resolution images from different plane-wave azimuthal steering angles are compounded to form a single high-resolution image, thereby reducing the effective frame rate and attenuating signals with high Doppler shifts. We recently introduced a spread-spectrum color Doppler imaging method [1] that produces high-resolution images without the use of compounding, thereby eliminating the trade-off between beam quality, frame rate, and the unaliased Doppler frequency limit. The method uses a Doppler ensemble formed from a long random sequence of transmit angles that randomizes the phase difference between echoes from the focal point and the out-of-cell (clutter) echoes, thereby spreading the clutter power in the Doppler frequency domain. The original spread-spectrum method suppressed vessel wall echoes, but did not address tissue clutter.
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".