Radiation Oncology

Table 1 Comparison of the new method to the Varian SmartAdapt deformable registration in terms of DSC

From: Deformable image registration for adaptive radiotherapy with guaranteed local rigidity constraints

Prostate						Bladder					Right femoral head
ID	Rigid	VSA	REG0	REG1	REG2	Rigid	VSA	REG0	REG1	REG2	Rigid	VSA	REG0	REG1	REG2
0	0.79	0.81	0.85	0.84	0.82	0.84	0.91	0.90	0.91	0.91	0.94	0.94	0.96	0.96	0.96
1	0.80	0.89	0.85	0.85	0.85	0.83	0.91	0.86	0.86	0.86	0.89	0.94	0.94	0.95	0.95
2	0.53	0.71	0.75	0.71	0.75	0.66	0.87	0.86	0.85	0.85	0.89	0.91	0.91	0.91	0.91
3	0.74	0.70	0.80	0.80	0.79	0.76	0.85	0.89	0.89	0.89	0.89	0.92	0.93	0.93	0.93
4	0.70	0.73	0.81	0.81	0.81	0.74	0.82	0.80	0.80	0.80	0.92	0.94	0.94	0.94	0.94
5	0.82	0.82	0.85	0.85	0.87	0.82	0.87	0.92	0.92	0.92	0.89	0.93	0.94	0.94	0.94
6	0.84	0.81	0.84	0.84	0.84	0.83	0.88	0.84	0.84	0.84	0.90	0.89	0.90	0.90	0.90
7	0.71	0.82	0.85	0.85	0.85	0.49	0.75	0.78	0.78	0.78	0.91	0.95	0.97	0.98	0.98
8	0.70	0.86	0.77	0.77	0.82	0.63	0.81	0.83	0.83	0.80	0.93	0.95	0.95	0.95	0.95
9	0.76	0.81	0.79	0.80	0.79	0.80	0.89	0.89	0.89	0.89	0.90	0.94	0.95	0.95	0.95
Avg	0.74	0.80	0.82	0.81	0.82	0.74	0.86	0.86	0.86	0.85	0.91	0.93	0.94	0.94	0.94
Std	0.09	0.06	0.04	0.05	0.04	0.11	0.05	0.04	0.05	0.05	0.02	0.02	0.02	0.02	0.02

For ten cases, contours were propagated from CT to CBCT using the computed deformation. DSC values in comparison with expert provided delineations are given for each structure and each case. Abbreviations: “Rigid”: rigid pre-alignment; “VSA”: Varian SmartAdapt deformable registration; “REG0”: new approach without local rigidity; “REG1”: new approach with rigid bones; “REG2”: new approach with rigid bones and prostate; “Avg”/“Std”: average/standard deviation over all cases for each method and structure

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ISSN: 1748-717X

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