PET and SPECT performance of the Siemens HD3 e.cam/sup duet//spl reg/ : a 1" Na(I) hybrid camera
Bibliographic record
Abstract
Siemens has recently developed a new PET/SPECT dual head camera, the e.cam/sup duet//spl reg/. This camera employs two HD3 detectors with 1" thick Na(I) segmented crystals. This design, relatively new for Na(I), is aimed at increasing the stopping power for 511 keV /spl gamma/ rays, while maintaining good spatial resolution for SPECT. The PET performance of this camera was evaluated using the new NEMA NU2-2001 specifications. The effect of the thicker crystal on the camera's performance in the single photon acquisition mode was assessed by comparing its resolution and sensitivity to that obtained with a standard gamma camera with a 3/8" crystal. The Siemens exam was selected for this purpose as it is a very similar dual-head variable-angle system with several hardware and software elements identical to the e.cam/sup duet//spl reg/ camera.
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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) | 0.000 | 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 | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".