Low dead time digital SPAD readout architecture for realtime small animal PET
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
CMOS integrated SPAD array design normally enforces a compromise between circuit functionalities and optical detection fill factor, never quite reaching the ideal detector configuration when both are integrated together on the same substrate. The emergence of vertical 3D integrated circuits (3DIC) changes this restriction and further adds in heterogeneous electronic integration, opening technological combinations otherwise difficult or impractical to obtain. Using this approach, a heterogeneous SPAD array detector prototype with digital readout for small animal PET was developed. It is based on Global Foundries 130 nm CMOS for digital and quenching circuits and on Teledyne Dalsa 0.8 μm HV CMOS process for the SPAD arrays. This paper focuses on the realtime digital architecture tailored for small animal PET scintillation detection, where in addition to tight timing and energy resolution, low PET dead time and high spatial resolution are required. A discriminator circuit is proposed to retain first-photon timing information while protecting against dark count rate triggering. The system provides two operational modes: a slower oscilloscope-like mode and a high rate PET mode providing 2.2M singles per second on a single 200 MHz LVDS transmitter. Performances in terms of electronic jitter and event detection are reported based on simulations.
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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 | 0.001 |
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 it