摘要
目的探讨双层探测器光谱CT 70 keV单能量图像(VMI)提升腹部动脉期图像质量的应用价值。方法回顾性分析2019年1月至5月在中国医科大学附属盛京医院Philips IQon双层探测器光谱CT上行腹部增强扫描患者的动脉期影像资料。共纳入50例患者,男12例,女38例,年龄26~74(53±12)岁。对双层探测器光谱CT混合迭代重建生成的传统图像(CI组)与光谱重建获得的70 keV VMI组图像进行客观、主观评价。比较70 keV VMI和CI组腹主动脉、腹腔干动脉、肠系膜上动脉、左肾动脉、右肾动脉、肝、脾、胰腺、左肾和右肾的CT值、噪声、信噪比(SNR)和对比噪声比(CNR)。2名医师独立双盲采用5分法评价70 keV VMI和CI组图像质量。采用配对样本t检验对客观指标进行比较,采用Wilcoxon秩检验对主观评分进行比较,两位医师间主观评分一致性采用Kappa检验。结果除胰腺外,70 keV VMI组腹部血管和实质脏器的CT值均高于CI组,差异具有统计学意义(P均<0.05);70 keV VMI组胰腺的CT值[(108.65±11.62)HU]较CI组[(109.72±11.77)HU]稍低,差异具有统计学意义(t=-3.097,P=0.003)。70 keV VMI组腹部血管和实质脏器的噪声均低于CI组,差异具有统计学意义(P均<0.001)。70 keV VMI组腹部血管和实质脏器的SNR和CNR均高于CI组,差异具有统计学意义(P均<0.001)。70 keV VMI组主观评分高于CI组,分别为5(4,5)和4(4,5)分,差异具有统计学意义(Z=-4.131,P<0.001),两医师间主观评分一致性较好,70 keV VMI和CI组Kappa值分别为0.79和0.69。结论双层探测器光谱CT 70 keV VMI与CI相比能够降低噪声,提高SNR、CNR,优化腹部动脉期图像质量。
Objective To explore the value of 70 keV virtual monoenergetic images(VMI)on dual-layer spectral detector CT in improving abdominal arterial phase images quality.Methods The arterial phase images of patients who underwent abdominal enhanced scan on the Philips IQon dual-layer spectral detector CT in Shengjing Hospital of China Medical University from January to May 2019 were retrospectively analyzed.Fifty patients(12 males,38 females)were included with age of 26-74(53±12)years.Objective and subjective evaluation was performed in 120 kVp polychromatic conventional images(group CI)which derived from iterative reconstruction algorithm and group 70 keV VMI which derived from spectral reconstruction algorithm.The attenuation,noise,signal to noise ratio and contrast to noise ratio of abdominal aorta,celiac trunk,superior mesenteric artery,left kidney artery,right kidney artery,liver,spleen,pancreas,left and right kidney were compared between group 70 keV VMI and CI by using paired t test.Image quality of group 70 keV VMI and CI was evaluated by two radiologists independently with a 5-point scale and compared by Wilcoxon rank test.The inter-agreement of subjective scoring between the two radiologists was evaluated by Kappa test.Results Except for pancreas,the attenuation of abdominal arteries and solid organs in group 70 keV VMI were higher than that of group CI and the difference was statistically significant(P all<0.05).The attenuation of pancreas was lower than that of group CI(t=-3.097,P=0.003).The noise of abdominal arteries and solid organs in group 70 keV VMI showed lower values compared to group CI and the difference was statistically significant(P all<0.001).The signal to noise ratio as well as contrast to noise ratio of abdominal arteries and solid organs in group 70 keV VMI was higher than that of group CI and the difference was statistically significant(P all<0.001).Subjective image quality scores in group 70 keV VMI were higher than that of group CI and scores of group 70 keV VMI and CI were 5(4,5)and 4(4,
作者
任海燕
甄艳华
畅智慧
龚正
郑加贺
Ren Haiyan;Zhen Yanhua;Chang Zhihui;Gong Zheng;Zheng Jiahe(Department of Radiology,Shengjing Hospital of China Medical University,Shenyang 110004,China)
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2020年第7期660-664,共5页
Chinese Journal of Radiology
