Acquisition Parameters: SPECT or SPECT/CT
| Parameter | Specification | Standard/preferred/optional |
|---|---|---|
| Camera type | Large-field-of-view multidetector | Standard |
| Energy peak | 140 keV | Standard |
| Energy window | 20% | Standard |
| Collimator | Low-energy, high-resolution | Standard |
| Patient position | Supine | Standard |
| Camera position | Lungs within field of view | Standard |
| Inhalation-to-imaging time | Acquisition started on completion of inhalation | Standard |
| Acquisition type | Step and shoot or continuous | Standard |
| Orbit | 180° or 360° | Standard |
| Orbit type | Noncircular | Standard |
| Matrix | 128 × 128 | Standard |
| Number of projections | 120 | Standard |
| Time per projection | 12–15 s | Standard |
| CT acquisition | Per manufacturer’s recommendations for attenuation correction or diagnostic imaging | Optional |