| Variables |
Derived |
| Ratio I |
Mean HU value of tumor / mean HU value of pancreas |
| Ratio II |
Mean HU value of cystic tumor / mean HU value of normal pancreas |
| Ratio III |
Mean HU value of solid tumor / mean HU value of cystic tumor |
| SD Ratio I |
Standard deviation of HU value at solid tumor / mean HU value at normal pancreas |
| SD Ratio II |
Standard deviation of HU value at solid tumor / standard deviation of pancreas |
| SD Ratio III |
Standard deviation of HU value at solid tumor / mean HU value at aorta |
| Normalized enhancement I |
Mean HU value of solid tumor/ mean HU value of aorta |
| Normalized enhancement II |
Mean HU value of cystic tumor / mean HU value of aorta |
| Signal to Noise Ratio I |
(Mean HU value of normal pancreas – mean HU value at solid tumor mean)/Standard Deviation at normal pancreas |
| Signal to Noise Ratio II |
(Mean of HU value of normal pancreas – mean HU value at cystic tumor)/Standard Deviation of HU value at normal pancreas |
