Figure 3.

Truncation simulation and registration results (Case 5). (a)proj_complete: complete CBCT projection; (b) ${\text{CBCT}}_{\text{original}}^{\text{complete}}$: reconstructed CBCT image using complete projection; (c) proj_truncated: truncated CBCT projection; (d) ${\text{CBCT}}_{\text{original}}^{\text{truncated}}$: reconstructed CBCT image using truncated projection; (e)CT_original: CT image before DIR; (f) ${\text{CT}}_{\text{deformed}}^{\text{demons}}$: deformed CT image using demons; (g) ${\text{CT}}_{\text{deformed}}^{\text{NaN}}$: deformed CT image using NaN method; (h) ${\text{CT}}_{\text{deformed}}^{\text{New}}$: deformed CT image using our method. The arrows indicate regions that affected by truncation.