Design and Evaluation of a Partly Segmented Light Guide for High Resolution Solid-State Positron Emission Tomography (PET) Detectors
Bibliographic record
Abstract
The Radialis organ-targeted PET camera utilizes planar detector technology based on tileable individual detector blocks. Each detector block consists of a 24×24 array of polished LYSO crystals with a pitch size of 2.4 mm, coupled to an 8×8 array of silicon photomultipliers (SiPMs). A borosilicate light guide is positioned between the scintillation crystal array and the photosensors for light sharing and multiplexed readout. However, LYSO crystal identification degrades at the block edges due to asymmetrical light sharing and reflection. To address this, we developed a partly segmented light guide with slits filled with barium sulfate to redistribute light spread near the detector edges. Block detector prototypes with partially segmented light guides were evaluated using a 4-channel readout and a 64-channel PETsys readout, demonstrating improved coordinate reconstruction and edge LYSO crystal identification, especially with 4.0 mm slits and Enhanced Specular Reflector (ESR) wrapping.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".