Table 5 Diagnostic efficacy of the IVIM-DWI parametric values in the differentiation between the GR and PR groups.

From: Intravoxel incoherent motion diffusion-weighted imaging for discriminating the pathological response to neoadjuvant chemoradiotherapy in locally advanced rectal cancer

Parameter

AUC (95% CI)

Cut-off value

Sensitivity

Specificity

PPV

NPV

P

postD

0.790(0.642–0.939)

1.64 × 10−3 mm2/s

53.3%

100%

100%

79.4%

0.325a

∆%ADC

0.701(0.541–0.861)

47.6%

73.3%

70.4%

57.9%

82.6%

0.113b

∆%D

0.807(0.674–0.941)

41.8%

93.3%

59.3%

56.0%

94.1%

0.811c

  1. IVIM-DWI, intravoxel incoherent motion diffusion-weighted imaging; GR, good response; PR, poor response; D, pure diffusion coefficient; ADC, apparent diffusion coefficient; AUC, area under the curve; CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value; apostD vs ∆%ADC, b∆%ADC vs ∆%D, cpostD vs ∆%D.
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