Table 2.

Volume changes and overlap agreements of lesion masks following nonlinear registration to the presenting structural image compared to rigid body registration of the same masks

Time point	Number of patients	Volume following rigid body registration, mL	Volume following nonlinear registration, mL	Paired t‐test of volumes	Percentage change, %	Mean overlap, %	Union overlap, %
24 h	27	30.1	26.1	0.004	−13.1	90.6	82.9
1 week	30	39.0	31.9	0.04	−18.2	87.6	77.9
1 month	29	17.5	17.2	0.13	−2.2	91.1	83.7