Liu Shuang, Chen Zhi-Ye
Department of Radiology,Hainan Hospital of Chinese PLA General Hospital,Sanya,Hainan 572013,China.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 2023 Apr;45(2):280-284. doi: 10.3881/j.issn.1000-503X.15065.
Objective To explore the optimal parameters for virtual mono-energetic imaging of liver solid lesions. Methods A retrospective analysis was performed on 60 patients undergoing contrast-enhanced spectral CT of the abdomen.The iodine concentration values of hepatic arterial phase images and the CT values of different mono-energetic images were measured.The correlation coefficient and coefficient of variation were calculated. Results The average correlation coefficients between iodine concentrations and CT values of hepatic solid lesion images at 40,45,50,55,60,65,and 70 keV were 0.996,0.995,0.993,0.989,0.978,0.970,and 0.961,respectively.The correlation coefficients at 40(=0.007),45(=0.022),50 keV (=0.035)were higher than that at 55 keV,and the correlation coefficients at 40 keV(=0.134) and 45 keV(=0.368) had no significant differences from that at 50 keV.The coefficients of variation of the CT values at 40,45,and 50 keV were 0.146,0.154,and 0.163,respectively. Conclusion The energy of 40 keV is optimal for virtual mono-energetic imaging of liver solid lesions in the late arterial phase,which is helpful for the diagnosis of liver diseases.
目的 探讨肝脏实性病变虚拟单能量成像的最佳参数。方法 对60例行腹部对比增强光谱CT检查的患者进行回顾性分析。测量肝动脉期图像的碘浓度值及不同单能量图像的CT值。计算相关系数和变异系数。结果 40、45、50、55、60、65和70 keV时肝脏实性病变图像碘浓度与CT值的平均相关系数分别为0.996、0.995、0.993、0.989、0.978、0.970和0.961。40 keV（=0.007）、45 keV（=0.022）、50 keV（=0.035）时的相关系数高于55 keV时，40 keV（=0.134）和45 keV（=0.368）时的相关系数与50 keV时无显著差异。40、45和50 keV时CT值的变异系数分别为0.146、0.154和0.163。结论 40 keV能量对于肝动脉晚期肝脏实性病变的虚拟单能量成像最为理想，有助于肝脏疾病的诊断。
