Study of the transient response of PI/a-Se photodetectors for indirect conversion medical imaging
Bibliographic record
Abstract
Previously two different amorphous selenium (a-Se) photodetector designs were proposed for indirect conversion medical imaging using polyimide (PI) as blocking contacts: a lateral comb structure where a PI layer covers both electrodes and a vertical structure where a PI layer is placed between the positively biased electrode and a-Se. These detectors have raised interest due to their simple structure, ease of fabrication, very low dark current at high electric fields, and high quantum efficiency. In this study we examine the transient behavior of these detectors for fluoroscopic or tomographic applications. The photo response to a short light pulse (10-100 μs) is examined in both structures. The presence of charge accumulation at the PI/a-Se interface is investigated by observing the photo response of consecutive light pulses under different electric fields. This work demonstrates the promise of low-cost a-Se devices for use in indirect conversion large area digital medical X-ray imaging applications such as real-time fluoroscopy and computed tomography.
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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 | 0.001 | 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".