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Region of interest (ROI) set characteristics
| Characteristics | A | B | C | D | E | |
|---|---|---|---|---|---|---|
| ROI shape | Circle | Circle | Circle | Circle | Square | |
| Longus capitis | 8 | 8 | 8 | 8–20 | 8 × 8 | |
| Pharyngeal muscles | 5 | 5 | 5 | 5–9 | 5 × 5 | |
| ROI diameter (circle, pixels)/size in pixels (square) | Palatal muscles | 5 | 5 | 5 | 5–8 | 5 × 5 |
| Genioglossus | 10 | 10 | 10 | 10–25 | 10 × 10 | |
| Geniohyoid | 7 | 7 | 7 | 7–13 | 7 × 7 | |
| Mylohyoid | 5 | 5 | 5 | 5–8 | 5 × 5 | |
| ROI location | I | II | III | I | I |
