| ↑ | Clear documented evidence of improvement in science and methodology of PET/MRI |
| ↗ | Suggestion of improvement in methodology applied to PET/MRI but requires further investigation |
| ↔ | No change but satisfactory status since previous workshop 1 year ago |
| ↘ | Little advancement in science and methodology of PET/MRI despite previous recognition of need for improvement |
| ↓ | Less clear knowledge now exists than previously, despite further developments in science and methodology of PET/MRI |
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