Safety assessment of microwave radar breast imaging in the 0.434-9 GHz range
Bibliographic record
Abstract
In recent years, microwave imaging has become a possible candidate for the early detection of breast cancer. Due to the different water content, there exists a dielectric contrast between malignant and healthy breast tissue at microwave frequencies. In addition, breast tumours appear relatively close to the skin surface, allowing low-power microwaves to penetrate through the tissue with a loss that is acceptably low to permit for a radar-like detection approach. While this imaging modality is relatively new, and a few prototypes have been reported, not many publications consider its safety. This work studies the exposure of a breast in the far field of radiofrequency sources operating in the 0.434-9-GHz range to assess the safety of a basic radar microwave imaging system. The electromagnetic fields inside a realistic MRI-derived 3-D numerical breast model has been computed using the finite-difference time-domain (FDTD) method with the help of SEMCAD-X (Schmid & Partner Engineering AG), a 3-D FDTD solver. It was used to model the resulting Specific Absorption Rate (SAR) of the breast tissue exposed to a plane wave. Experimental results are presented and discussed to determine whether they comply with exposure limits from Health's Canada Safety Code 6.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| 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".