The architectural impact of single photon transmission measurements on full ring 3-D positron tomography
Bibliographic record
Abstract
For the full potential of high resolution (2 to 4 mm) full ring 3-D positron emission tomography (PET) to be realized, reductions in both scan time and noise for measured attenuation correction must be provided. Recent advancements in 3-D PET transmission measurements have been demonstrated using a point source and collecting single photon gamma radiation. Greater than an order of magnitude increase in counting statistics for 3-D acquisitions is possible over traditional dual photon techniques such as rotating rods. Usable single photon transmission scans as short as 2 minutes are practical. Such short scans will have reduced noise due to counting rates in excess of 2.5 M events/sec. Acquiring single photon transmission data in full ring 3-D PET requires several architectural additions to the tomograph. Additions include: 1) a "place holding" mode for the coincidence processor, 2) real-time single photon line of response rebinning electronics, 3) a liquid drive for moving a 4 mCi /sup 137/Cs point source at 1 metre/sec around the field of view, and 4) a fiber-optic detector system for tracking the point source position and speed. Initial implementation of these changes supports a first-of-its-kind 82 cm diameter, 23 cm axial length high resolution full ring 3-D PET tomograph.
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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 | 0.002 |
| 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".