宝石能谱成像对肝脏乏血供转移灶的应用价值

摘要

Objective:To study the expression characteristics of gemstone spectral imaging(GSI) of liver lack blood supply metastases.Methods:12 cases of liver lack blood supply metastases patients with 46 metastases were selected.Through the GSI browser,we obtained the iodine based image,HU attenuation curve and correspondent single energy image of the best contrast-to-noise ratio(CNR).The differences in the image quality of single energy image and hybrid energy image(140 kVp) were compared.Results:The best CNR correspondent single energy level of the liver metastasis is majority with 68 keV.The image quality subjective score,image noise and CNR of arterial phase and portal venous phase 68 keV images were all higher than those of the mixed energy image(P<0.05).There were statistically significant differences in the average iodine concentration of liver metastasis in arterial phase and portal venous phase.Conclusion:68 keV images can significantly improve the contrast between lack blood supply metastases and normal liver tissue.The iodine concentration of liver lack blood supply metastases in portal venous phase is higher than that of arterial phase,and the slope of HU attenuation curve is greater than that of arterial phase.%目的：研究肝脏乏血供转移灶宝石能谱成像(GSI)的表现特点。方法：选取肝脏乏血供转移灶患者12例，共46个转移灶，通过GSI浏览器获得碘基图像、HU衰减曲线和最佳对比噪声比(CNR)相对应的单能量图像。比较单能量图像和混合能量图像(140 kVp)质量的差异。结果：肝脏转移灶最佳CNR相应单能量水平以68 keV居多。动脉期和门静脉期68 keV图像的质量主观评分、图像噪声和CNR均高于混合能量图像(P＜0.05)。动、门静脉期肝脏转移灶的平均碘浓度差异有统计学意义。结论：68 keV图像能明显提高乏血供转移灶与正常肝组织的对比。肝脏乏血供转移灶门脉期的碘浓度高于动脉期，HU衰减曲线的斜率也大于动脉期。