Segmentation of the Left Ventricle for the Cardiac Phases between End-Diastole and End-Systole
Bibliographic record
Abstract
Automatic segmentation of cardiac structures, including the left ventricle (LV), is a crucial step for evaluating cardiac function. While deep learning is the leading approach for this task, the scarcity of labeled data presents a significant challenge. In scenarios with very limited labeled data, even semi-supervised learning methods may not be effective as they rely on the performance of an initially trained network. In this work, we propose a novel method for segmenting the LV contours for unlabeled cardiac phases between end-diastole (ED) and end-systole (ES). Our method leverages temporal coherence from the LV volume-time and shape information from the labeled cardiac phases to transform the ED and ES ground truth labels to the intervening cardiac phases, resulting in a larger set of labeled data. We evaluate our approach using three methods: 1- visual inspection, 2- using our method as data augmentation for training a CNN with limited ground truths, and 3- comparing results with fully supervised segmentation networks. Our method outperforms in all validation methods. Implementation is available at: "https://github.com/behnam-rahmati/LV-label-propagation".
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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 | 0.000 |
| 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 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".