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Correlation matrix of HRCT histogram indices including NL, PFF, HAA_A, kurtosis, and LAA at −200 HU threshold. HAA, defined as the areas with attenuation values greater than −200 HU, is not shown. In NL, PFF, HAA_A, HAA, LAA parameters, the ‘%’ has been omitted for ease of reading.
| HU: −200 | |||||
|---|---|---|---|---|---|
| NL | PFF | HAA_A | Kurtosis | LAA | |
| NL | 1.00 | −0.58 | −0.60 | 0.62 | −0.41 |
| PFF | −0.58 | 1.00 | 0.99 | −0.87 | −0.50 |
| HAA_A | −0.60 | 0.99 | 1.00 | −0.90 | −0.47 |
| Kurtosis | 0.62 | −0.87 | −0.90 | 1.00 | 0.31 |
| LAA | −0.41 | −0.50 | −0.47 | 0.31 | 1 |
