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Table 2 Correlations between the change rates of parotid T2 or FF values and parotid atrophy rates or mean radiation dose during radiotherapy

From: Early evaluation of radiation-induced parotid damage in patients with nasopharyngeal carcinoma by T2 mapping and mDIXON Quant imaging: initial findings

 

RV

Mean radiation dose

 

r

P value

r

P value

Mid-RT

 RT2

0.092

0.525

0.087

0.530

 RFF

0.038

0.820

0.121

0.591

Post-RT

 RT2

0.313

0.027a

−0.106

0.444

 RFF

−0.029

0.863

−0.419

0.052

  1. Note: Pre-RT within 2 weeks before radiotherapy, mid-RT 5 weeks after the beginning of radiotherapy, post-RT 4 weeks after radiotherapy. RV, RT2 and RFF are the change rates of parotid volume, T2 value and fat fraction (FF) compared with pre-RT, respectively. a P < 0.05 with Pearson’s correlation test