Size-Adaptive Occipital 18-Channel Receive-Only RF Coil for 3T MRI
Bibliographic record
Abstract
The performance of a conformal occipital receive-only radio-frequency (RF) array is demonstrated at 3T. The ultimate aim of this larger coil is to improve whole-brain magnetic resonance imaging (MRI) regardless of a person's head size and shape. The occipital array contains 18-channels built on a 3D-printed 3-mm thick thermoplastic polyurethane (TPU) plate, which acts as a flexible substrate. To show the performance improvements of our design a comparative study was performed where three differently shaped phantoms were used when imaging by our occipital array then by a standard rigid 64-channel head product coil (posterior 40-channel section only). Signal-to-noise-ratio (SNR) and noise correlation performance were evaluated. Compared to the product coil, the flexible occipital array improved mean SNR by 2.8×. Noise correlation was comparable to the product coil. These results lead us to conclude that our design represents a viable approach to improve SNR for differently shaped heads and supports the feasibility of a larger 128-channel size-adaptable whole-head array currently in development.
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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".