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Table 2 The IVIM and DCE MR parameters of parotid glands pre-RT and post-RT

From: Early evaluation of irradiated parotid glands with intravoxel incoherent motion MR imaging: correlation with dynamic contrast-enhanced MR imaging

  pre-RT post-RT p value
IVIM MR parameters
 ADC (10−3 mm2/s) 0.88 ± 0.15 1.45 ± 0.20 <0.001a
 D (10−3 mm2/s) 0.72 ± 0.13 1.16 ± 0.21 <0.001a
 D* (10−3 mm2/s) 36.3 ± 22.7 50.8 ± 27.4 0.024a
 f (%) 13.3 ± 3.9 19.2 ± 5.6 <0.001a
DCE parameters
 MRE (%) 182.0 ± 41.3 287.1 ± 41.4 <0.001a
 TTP (s) 42.4 ± 28.9 53.7 ± 26.0 0.037a
 Wash in Rate (i/s) 97.5 ± 44.4 159.8 ± 54.5 <0.001a
  1. IVIM Intravoxel incoherent motion, DCE Dynamic contrast-enhanced, pre-RT Approximately 2 weeks before radiotherapy (RT), post-RT approximately 4 weeks after RT, ADC Apparent diffusion coefficient, D Pure diffusion coefficient, D* Pseudo-diffusion coefficient, f perfusion fraction, MRE Maximum relative enhancement, TTP Time to peak
  2. adenotes a significant difference between pre-RT and post-RT parameters