Simulation and Verification of Magnetic Field Gradient Waveforms in the Presence of a Metallic Vessel in Magnetic Resonance Imaging
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Bibliographic record
Abstract
We present simulation and experimental results regarding the generation of eddy currents due to switched magnetic field gradients during the use of metallic vessels in high-pressure magnetic resonance imaging (MRI) applications. The induced eddy currents result in a corruption of the applied magnetic field gradient as experienced by the object being imaged. Simulations using CST EM Studio™ have revealed the spatial distribution and temporal evolution of eddy currents, the resulting magnetic fields, and their dependence on vessel material and orientation of the applied switched magnetic field gradient. The simulation results have been compared to measured data with excellent agreement. Agreement between simulated and measured data permits increasingly sophisticated models to be developed such that simulation results reliably guide the design of improved metal vessels.
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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 | 0.000 |
| 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 it