Description of Metabolic and Integrity Category for Classification of Peritumoral Fiber Tract Alterations in Gliomas
| Limit values | Metabolic category description | Integrity category description | Label |
| FET-ICR | |||
| >1.6 | Tumor-infiltrated tissue | T | |
| ≤1.6 and >1.1 | Reactive tissue | R | |
| ≤1.1 and >0.9 | Normal tissue | N | |
| ≤0.9 | Attenuated amino acid metabolism | A | |
| FD-ICR | |||
| >1.15 | Compressed fiber structures | C | |
| ≤1.15 and ≥0.85 | Structure with normal FD | N | |
| <0.85 | Attenuated fiber structure | A |
Reactive tissue is brain tissue showing astrogliosis or microglial activation.