Table 4. The mean and standard deviations as calculated from relative cerebral blood volume (rCBV) histogram values of glioblastoma multiforme tumour perfusion series for grade II, III and IV gliomas.
| Parameter |
Raw |
Normalised |
||||
| Grade II | Grade III | Grade IV | Grade II | Grade II | Grade IV | |
| Mean | 3±1 | 3±1 | 5±2 | 1.7±0.6 | 3±1 | 3±1 |
| Standard deviation | 1.9±0.9 | 2±2 | 4±1 | 1.1±0.5 | 2±1 | 3±1 |
| Median | 2±1 | 2.2±0.9 | 4±2 | 1.4±0.5 | 2±1 | 3±1 |
| Mode | 0.6±0.9 | 0.9±0.8 | 1±1 | 0.8±0.4 | 1.5±0.8 | 2±4 |
| Skewness | 2±1 | 1.9±0.2 | 1.2±0.7 | 2.1±0.8 | 1.8±0.3 | 1.2±0.7 |
| Kurtosis | 15±13 | 8±2 | 5±4 | 12±7 | 7±2 | 5±3 |
Raw values represent the unchanged perfusion values, while normalised values were first normalised by the averaged rCBV value in a region of contralateral white matter.