Improving the performance of small planar detectors for dedicated PET instruments
Bibliographic record
Abstract
Several dedicated PET instruments for small animal and breast imaging have recently been developed. Many of these use position-sensitive photomultiplier tubes (PS-PMTs) and pixelated crystals with depth encoding scheme to detect and localize gamma rays. Large area PS-PMTs show more distortion and have difficulty identifying crystal elements near their periphery. We have recently enhanced the bismuth germinate (BGO) detector modules used in the our positron emission mammography (PEM) and animal PET (ANIPET) systems by modifying the crossed anode readout resistor chain, applying a faster timing amplifier circuit, which takes the last dynode signal as event timing and adding a new image weighting function to improve the crystal identification. The PMTs field-of-view (FOV) have increased from 46 /spl times/ 58 mm to 56 /spl times/ 64 min and the timing resolution of system has improved from 12.0 to 8.7 ns.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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".