目的 探讨应用多b值DWI中不同b值ADC值评估胶质瘤近期治疗效果及鉴别肿瘤进展的价值.方法 对47例经手术病理证实为脑胶质瘤且接受联合放化疗的患者行常规MRI及多b值DWI(b=0、1 000、2 000、3 000 s/mm2)扫描.分别在5种不同b值组合(b值组合分别为:0、1 000 s/mm2,0、2 000 s/mm2,0、3 000 s/mm2,1 000、3 000 s/mm2,2 000、3 000 s/mm2)的ADC图[ADC(1000/0)、ADC(/2000/0)、ADG3 000/0)、ADC(3 000/1 000)、ADC(3 000/2 000)]中测量病灶的平均和最小ADC值(ADCman和ADCmin),计算其相对值(rADCmean、rADCmin).比较治疗后不同反应类型(完全有效、部分有效、稳定、进展)间及进展组与非进展组间ADC值的差异,通过ROC曲线分析不同ADC值诊断肿瘤进展的最佳临界值和诊断效能.结果 ADC(3 000/0)、ADC(3000/1000)和ADC(3000/2000)图中的rADCmean在不同反应类型间和进展组与非进展组间差异均有统计学意义(P均＜0.05);ADC(3000/1000)和ADC(3000/2000)图中的ADCmean在不同反应类型间和进展组与非进展组间差异均有统计学意义(P均＜0.05).ADC(3000/2000)图中ADCnmean和rADCmean诊断肿瘤进展的曲线下面积最大,分别为0.86和0.84,以ADCmean=408.65×10-6 mm2/s和rADCmean=1.12诊断胶质瘤进展的敏感度、特异度分别为89.3％0、71.0％和92.9％、77.4％.结论 通过高b值ADC图中病灶的ADCmean和rADCmean可较准确地评估胶质瘤的近期治疗效果,并为鉴别胶质瘤术后肿瘤进展提供有价值的信息.%Objective To evaluate the application value of ADC of different b-value ADC maps in multiple b-value DWI for assessment of early treatment response and detection of tumor progression.Methods Totally 47 postoperative patients with glioma were enrolled.All of them accepted chemoradiotherapy after operation.Conventional MRI and multiple b-value DWI (b=0,1 000,2 000,3 000 s/mm2) scans were performed.The mean and minimal ADC values (ADC and ADCrmin) were measured in 5 differrent corresponding ADC maps,such as ADC(1 000/0),ADC(/2 000/0),ADC(3 000/0),ADC(3 000/1000） and ADC(3 000/2 000).And the relative values (rADC and rADCmin) were calculated.The differences of ADC values among different reaction types (complete response,partial response,stable disease and progressive disease)and between progressive and non-progressive groups were compared.ROC analysis was used to determine the best cutoff values and diagnostic efficiency of ADC value for diagnosis of tumor progression.Results The rADC in ADC(3 000/0),ADC(3 000/1000） and ADC(3 000/2 000) maps were significantly different among different response types and between progressive group and non progressive group (all P＜0.05).The ADC in ADC(3 000/1000） and ADC(3000/2 000) maps were significantly different among different response types and between progressive group and non-progressive group (all P＜0.05).The ADC and rADC in ADC(3 000/2 000) map had the maximum area under curve (0.86,0.84).When ADC and rADC in ADC3 000/2 000 map were 408.65 × 10-6 mm2/s and 1.12,the sensitivities and specificities were 89.3 ％0,71.0 ％00 and 92.9 ％,77.4 ％,respectively.Conclusion The ADC and rADC in high b-value ADC maps are helpful to discriminate the early treatment response from tumor progression,which can provide valuable information for identification of tumor progression of glioma after treatment.
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