CT 能谱成像定量评估胃癌 Lauren 分型的应用价值

目的：探讨 CT 能谱成像(GSI)定量评估胃癌 Lauren 分型的价值。方法对52例胃镜确诊胃癌的患者于术前行 CT GSI 增强扫描,通过 GSI Viewer 分析软件获得单能量图、碘基图,测得病灶的 CT 值、碘浓度,计算标准化碘浓度比,并与术后病理对照,采用单因素方差分析多重比较进行统计学分析。结果肠型、混合型、弥漫型胃癌的动脉期碘浓度、标化碘浓度比、40~70 keV、40~140 keV、70~140 keV 各能量区间能谱曲线斜率分别为12.86±6.80(100μg/mL)、0.13±0.06、2.50±1.26、0.99±0.51、0.34±0.20,18.54±6.49(100μg/mL)、0.19±0.07、3.56±1.24、1.42±0.50、0.50±0.18和24.52±9.68(100μg/mL)、0.24±0.09、4.73±1.76、1.90±0.73、0.68±0.29。其中,肠型胃癌的各组数值均明显低于弥漫型胃癌,2组间差异有统计学意义(P <0.05)；肠型-混合型、混合型-弥漫型两两比较,除肠型-混合型碘浓度比 P 值为0.037,其余各指标组间差异均无显著性(P >0.05)。结论GSI 能谱曲线斜率、碘浓度、标准化碘浓度比有助于术前评估胃癌的 Lauren 分型。

Application value of spectral CT imaging in quantitative evaluation of Lauren classification of gastric cancer

Objective To explore the value of gemstone spectral imaging (GSI)in quantitative evaluation of Lauren classification of gastric cancer.Methods Fifty-two patients with gastric cancer confirmed by gastroscopy underwent contrast-enhanced spectral CT imaging preoperatively.The monoergic and iodine-based images were obtained by GSI Viewer software,CT value and iodine concentration (IC)of the lesions were measured,and normalized iodine concentration (NIC)was calculated.With the reference of postoperative pathology,data were analyzed by LSD method of one-way analysis of variance.Results The IC,NIC,spectrum curve slope of 40-70 keV,40-140 keV and 70-140 keV energy range of intestinal type,mixed type and diffuse type carcinoma in the arterial phase were 12.86±6.80 (100 μg/mL),0.13±0.06 ,2.50±1.26 ,0.99±0.51 ,0.34±0.20 ,18.54±6.49 (100 μg/mL),0.19±0.07, 3.56±1.24,1.42±0.50,0.50±0.18 and 24.52±9.68 (100 μg/mL),0.24±0.09,4.73±1.76,1.90±0.73,0.68±0.29,respectively. The values of intestinal type were all significantly lower than those of diffuse type (P <0.05).Comparison between intestinal-mixed type and mixed-diffuse type,the other parameters were no significant differences except IC between intestinal-mixed type (P=0.037).Conclusion The slope of spectrum curve,iodine concentration,and normalized iodine concentration could be helpful for preoperative evaluation of Lauren classification of gastric cancer.