Table 3.

Canny edge RMSE between CT_original and CBCT_original, ${\text{CT}}_{\text{deformed}}^{\text{demons}}$ and CBCT_original, ${\text{CT}}_{\text{deformed}}^{\text{DISC}}$ and CBCT_original, and ${\text{CT}}_{\text{deformed}}^{\text{DISC}}$ and CBCT_corrected.

	Case 1	Case 2	Case 3	Case 4	Case 5	Case 6
CToriginal-CBCToriginal	0.2707	0.2467	0.2623	0.2639	0.1863	0.2037
${\text{CT}}_{\text{deformed}}^{\text{demons}}-{\text{CBCT}}_{\text{original}}$	0.2541	0.2356	0.2764	0.2634	0.1752	0.2304
${\text{CT}}_{\text{deformed}}^{\text{DISC}}-{\text{CBCT}}_{\text{original}}$	0.2397	0.2165	0.2277	0.2257	0.1473	0.1979
${\text{CT}}_{\text{deformed}}^{\text{DISC}}-{\text{CBCT}}_{\text{corrected}}$	0.1923	0.1766	0.1855	0.1772	0.1014	0.1634