Table 2
Levels of increasing technological intensity of tools to rate functional imaging findings in patients with cognitive impairment
| Level | Medium | Technical requirements | Focal hypoperfusion/metabolism | |
|---|---|---|---|---|
| Measurement | Experience | |||
| ROI, region of interest. | ||||
| Experience denotes the training time needed to obtain accurate measurements. | ||||
| SPET/PET 1 | Hardcopy | — | Visual assessment | 1–2 weeks |
| SPET/PET 2 | Digital | — | ROI sampling | 1–3 days |
| SPET/PET 3 | Digital | Software for computerised post-processing | Voxel by voxel analysis in the stereotactic space61 | — |
