Table 5 Sample size calculations for the 6 different-sized ROIs to detect 10 to 25% changes in ADC values
From: Effect of region of interest size on ADC measurements in pancreatic adenocarcinoma
| Â | CV (inter-observer) | 10% | 15% | 20% | 25% |
|---|---|---|---|---|---|
ROI20 | 15.9% | 80 | 36 | 20 | 13 |
ROI46 | 15.7% | 78 | 35 | 19 | 12 |
ROI82 | 12.6% | 50 | 22 | 13 | 8 |
ROI115 | 14.0% | 62 | 28 | 15 | 10 |
ROI152 | 14.6% | 67 | 30 | 17 | 11 |
ROI214 | 10.1% | 32 | 14 | 8 | 5 |