目的探讨磁共振弥散加权成像 (DWI)技术在预测宫颈癌放射敏感性的应 用价值。方法 25例单纯放疗宫颈癌初诊 患者，外照射前、20GY以及结束时分别 进行1.5T磁共振常规系列及DWI扫描， 测量各时间点宫颈癌原发灶ADC值，分析 差异性以及与肿瘤退缩率的相关性。结 果 外照射前、20GY及结束时ADC值分别为 (0.93±0.14)×10-3、(1.25±0.17)×10- 3 s及(1.55±0.13)×10-3mm2 /s，两两之 间差异均有统计学意义(P值<0.01)； 外照射前与20GY的ADC值差值(R值)为 (0.33±0.16)×10-3mm2 /s。外照射前后肿 瘤退缩率为(0.86±0.11)。外照射前、 20GY以及结束时各ADC值与肿瘤退缩率均 无相关性(P值>0.05),R值与肿瘤退缩率有 正相关性(r=0.423，P=0.035)。结论 宫 颈癌原发灶ADC值放疗后升高；放疗后ADC 值的早期变化与肿瘤退缩率具有正相关 性，可作为预测宫颈癌放射敏感性的潜在 性功能影像学指标。

Objective To investigate the cinical value value of diffusion-weighted magnetic resonance imaging (DWI) in predicting the radiosensitivity of cervical cancer. Methods Twenty-five women with cervical cancer received radiotherapy were included, DWI was carried out prior to radiation, and repeated after 20GY and after the readiation using MRI scanner. The apparent diffusion coefficient (ADC) was calculated, compared and correlated with final tumour retraction. Results The ADC values of prior to radiation, 20GY and t after the readiation was (0.93±0.14)×10-3, (1.25±0.17)×10-3and (1.55±0.13)×10-3mm2 /s, it showed significant difference each other (P<0.01). The change of ADC between prior to radiation and 20GY therapy was (0.33±0.16)×10-3 mm2 /s, final tumour retraction was (0.86±0.11)×10-3mm2 /s. No correlation was found between ADC values and tumour retraction (P>0.05), while the changes in ADC showed a significant correlation with tumour retraction (r=0.423,P=0.035). Conclusion The ADC values of cervical cancer increased after radiotherapy, the early change of ADC value showed a correlation with final tumour retraction, Which has the potential to provide a surrogate biomarker of radiosensitivity in cervical cancers.