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Phantom build-up factor results. The fit results to equation (15) for the build-up study as a function of the threshold definition of the ROI are shown. Three different functional ROIs were defined using percentage of the maximum value, as well as the geometrical ROI.
| ROI definition | λ (cm−1) | μ (cm−1) | B (∞) | R2 |
|---|---|---|---|---|
| 50% of max | 0.1385 | 0.1500 | 1.651 | 0.999 |
| 25% of max | 0.1320 | 0.1418 | 1.507 | 0.999 |
| 10% of max | 0.1261 | 0.1343 | 1.425 | 0.999 |
