Meng Qing Lin, Zong Lin Xiong, Liu Meng Qi, Wang Ping Huai, 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. 2020 Dec 30;42(6):776-780. doi: 10.3881/j.issn.1000-503X.11915.
Objective To identify the optimal mono-energetic enhanced spectral CT for renal cortex in cortical phase based on the iodine concentration. Methods Fifty patients with normal renal function received the abdominal enhanced spectral CT examination.The iodine concentration and CT values of the multiple mono-energetic spectral images were measured on renal cortex in cortical phase,and the correlation between the iodine concentration and the CT values and the coefficient of variation(CV)were analyzed. Results The correlation analysis demonstrated that the correlation coefficient was 0.994,0.994,0.993,0.987,0.976,0.960,and 0.938 between mono-energetic spectral CT images(40-100 keV with interval 10 keV,respectively)and iodine concentration(all <0.001).The correlation coefficients of 40 keV,50 keV(=0.007)and 60 keV(=0.030)were significantly higher compared with that of 70 keV,and the correlation coefficients were not significantly among 40 keV,50 keV and 60 keV( =0.590).The CV of renal cortex in cortical phase was 0.21,0.20,and 0.19 for 40 keV,50 keV,and 60 keV,respectively. Conclusion 60 keV is the optimal mono-energy for the enhanced spectral CT of the renal cortex in cortical phase.
目的基于碘浓度确定皮质期肾皮质的最佳单能量增强光谱CT。方法 50例肾功能正常的患者接受腹部增强光谱CT检查。在皮质期测量肾皮质多个单能量光谱图像的碘浓度和CT值，分析碘浓度与CT值之间的相关性及变异系数（CV）。结果 相关性分析显示，单能量光谱CT图像（分别为40 - 100 keV，间隔10 keV）与碘浓度之间的相关系数分别为0.994、0.994、0.993、0.987、0.976、0.960和0.938（均<0.001）。40 keV、50 keV（=0.007）和60 keV（=0.030）的相关系数显著高于70 keV，40 keV、50 keV和60 keV之间的相关系数差异无统计学意义（=0.590）。40 keV、50 keV和60 keV时皮质期肾皮质的CV分别为0.21、0.20和0.19。结论 60 keV是皮质期肾皮质增强光谱CT的最佳单能量。
