RESUMO
Objective To analyze the index of relative apparent diffusion coefficient (rADC)of magnetic resonance diffusion weighted imaging (DWI)for nasopharyngeal carcinoma with cervical metastatic lymph node before and after treatment,assess the application value of rADC in the recent curative effect after radiotherapy and chemotherapy.Methods 45 cases of nasopharyngeal carcinoma with cervical metastatic lymph nodes proved pathologically were selected as the research objects,which was including 107 pieces of metastatic lymph nodes and underwent DWI.The rADC index of cervical metastatic lymph nodes before and after radiotherapy and chemotherapy was measured and calculated.The cervical metastatic lymph nodes were divided into effective group (CR+PR,n=84)and ineffective group(SD+PD,n=23),and the difference of the rADC index between the two groups was compared.Results For the target volume disappeared or reduced more than 30% in the effective group after treatment,the rADC index was significantly higher than that before treatment(t=4.981, P<0.05).The rADC difference between effective group and ineffective group was statistically significance (t=3.471,P<0.05).Conclusion rADC can be used as the auxiliary marker for the evaluation of short-term curative effect of nasopharyngeal carcinoma with cervical metastatic lymph nodes.