Table 3.
Metal artefact reduction with CT for carbon-ion therapy
| Metrics | Head phantom |
Patient 1 |
Patient 2 |
|||
|---|---|---|---|---|---|---|
| Uncorrected | SEMAR-corrected | Uncorrected | SEMAR-corrected | Uncorrected | SEMAR-corrected | |
| PTV | ||||||
| D99 (%) | 79.4 | 93.1 | 83.9 | 82.9 | 86.3 | 91.0 |
| D95 (%) | 82.4 | 95.4 | 92.2 | 92.5 | 90.9 | 95.7 |
| D50 (%) | 91.0 | 99.3 | 99.1 | 99.2 | 98.0 | 99.8 |
| Dmax (Gy (RBE)) | 59.9 | 60.5 | 62.8 | 63.4 | 64.5 | 64.5 |
| Dmin (Gy (RBE)) | 43.2 | 53.0 | 39.2 | 39.2 | 39.2 | 41.5 |
| Cord | ||||||
| Dmax (Gy (RBE)) | – | – | 12.7 | 12.1 | 19.8 | 16.7 |
D50, dose delivered to 50% of volume; D95, dose delivered to 95% of volume; D99, dose delivered to 99% of volume; Dmax, maximum irradiated dose; Dmin, minimum irradiated dose; PTV, planning target volume; RBE, relative biological effectiveness; SEMAR, single-energy metal artefact reduction.
Dose assessment results of uncorrected and SEMAR-corrected images. Uncorrected dose distribution was generated by beam plan of uncorrected images applying to SEMAR-corrected images. SEMAR-corrected dose distribution was generated by beam spots optimization to SEMAR-corrected images.