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Differences in clinical SPECT and PET imaging. Data in the table is collated from Rahmim et al. 65 and James et al. 56.
| Detection method | Geometric efficiency (percentage of detected to emitted γ rays) |
Temporal resolution | Spatial resolution | Sensitivity (concentration of radiotracer needed) |
|
|---|---|---|---|---|---|
| SPECT | Collimator detection | ~ 0.01% | Minutes | 8-10 mm | 10-10 to 10-11 M |
| PET | Coincidence detection | ~ 1% | Seconds - minutes | 5-7 mm | 10-11 to 10-12 M |
