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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

From: 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

Parameters On DIR of the thorax On DIR of the target center Z-value P-value
GTVpostCT -GTVpreMR
 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
GTVpostCT - CTVpreMR + 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
CTVpostCT + 10- GTVpreMR
 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
CTVpostCT + 10- CTVpreMR + 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
  1. Abbreviations: CI the conformity index, DI the degree of inclusion, DSC Dice’s similarity coefficientm, ΔV: the distance between the COM of the targets