Bibliographic record
Abstract
Supervised deep learning MRI reconstruction recovers images from accelerated MRI scans, but requires fully-sampled k-space for training. Self-supervised learning for MRI reconstruction bypasses the need for fully sampled k-space by partitioning under-sampled k-space into two disjoint sets, and training a neural network to predict one set from the other. Remarkably, self-supervised learning achieves performance similar to supervised learning without requiring fully sampled data. In this thesis, I enhance self-supervised learning methods through two key approaches: (1) learning an optimal k-space partitioning strategy, and (2) incorporating multi-contrast information into the reconstruction process. In the first approach, I trained a network to learn an optimal k-space partitioning probability distribution for self-supervised learning, outperforming previous heuristic-based methods. In the second approach, I demonstrate that integrating multiple MRI contrasts improves self-supervised reconstruction performance by leveraging correlated information across contrasts. I further improve the second approach by extending multi-contrast self-supervised learning to jointly learn an optimal k-space partitioning for each contrast. These proposed enhancements improve self-supervised reconstruction fidelity compared to previous single-contrast self-supervised learning methods.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.001 | 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".