A comparative study based on deformable image registration of the target volumes for external-beam partial breast irradiation defined using preoperative prone magnetic resonance imaging and postoperative prone computed tomography imaging

Table 4 Parameter evaluation of the target volume defined using preoperative prone MRI and postoperative prone CT based on the DIR of the thorax or target center

Parameters	On DIR of the thorax	On DIR of the target center	Z-value	P-value
GTV_{postCT -}GTV_preMR
CI	0.02 (0.00~0.18)	0.19 (0.06~0.48)	−3.724	0.000
DI	0.08 (0.00~0.54)	0.85 (0.48~1.00)	−3.724	0.000
DSC	0.03 (0.00~0.31)	0.32 (0.11~0.65)	−3.724	0.000
ΔV	2.71 (0.55~7.21)	0.06 (0.02~1.91)	-3.724	0.000
GTV_{postCT -} CTV_{preMR + 10}
CI	0.07 (0.00~0.23)	0.31 (0.17~0.48)	-3.724	0.000
DI	0.27 (0.00~0.85)	0.86 (0.38~1.00)	-3.724	0.000
DSC	0.13 (0.00~0.38)	0.47 (0.30~0.65)	-3.724	0.000
ΔV	2.67 (1.00~6.42)	0.14 (0.04~1.96)	-3.724	0.000
CTV_{postCT + 10}- GTV_preMR
CI	0.04 (0.00~0.16)	0.05 (0.01~0.20)	−2.591	0.010
DI	0.66 (0.00~1.00)	1.00 (0.84~1.00)	−3.201	0.001
DSC	0.07 (0.00~0.27)	0.09 (0.03~0.34)	−2.591	0.010
ΔV	2.54 (0.55~6.57)	0.28 (0.04~1.70)	−3.724	0.000
CTV_{postCT + 10}- CTV_{preMR + 10}
CI	0.17 (0.00~0.46)	0.38 (0.13~0.67)	−3.593	0.000
DI	0.43 (0.00~0.90)	0.89 (0.65~0.99)	−3.724	0.000
DSC	0.29 (0.00~0.63)	0.55 (0.24~0.80)	−3.636	0.000
ΔV	2.67 (0.00~6.44)	0.21 (0.05~1.75)	−3.724	0.000

Abbreviations: CI the conformity index, DI the degree of inclusion, DSC Dice’s similarity coefficientm, ΔV: the distance between the COM of the targets

ISSN: 1748-717X