摘要
目的比较基于模型迭代重建(MBIR)算法和柔性减影(CE-Boost)技术对提高肥胖患者CT肺动脉造影(CTPA)图像质量的效果。方法前瞻性分析60例临床疑似肺栓塞(PE)患者的CTPA资料。收集BMI超过25 kg/cm^(2)的患者,分别采用混合迭代重建(HIR)(A组)、MBIR(B组)和CE-Boost(C组)。定量评估肺动脉主干、左右肺动脉干CT值、图像噪声、信噪比(SNR)和对比噪声比(CNR)。两名放射科医生独立通过Likert 5分量表法对整体图像质量和诊断信心进行主观评分。采用配对样本t检验、Mann-Whitney U检验、单因素方差分析进行统计学分析。结果C组的CT值明显高于A组及B组(P<0.05),肺动脉主干CT值C组为(510.87±141.20)HU,A组为(354.31±93.74)HU,B组为(350.79±88.43)HU。B组图像噪声明显低于A组及C组(P<0.05),肺动脉主干噪声B组为16.60±3.03,A组为22.80±2.94,C组为24.63±4.96。B组及C组的肺动脉主干及左右肺动脉干的SNR值及CNR值均高于A组。B组及C组图像主观评分均高于A组,整体图像质量均从4(3,4)分提高到5(4,5)分,诊断信心均从3(3,4)分提高到4(4,5)分(P均<0.05)。在主观分析中,观察者间对于整体图像质量和诊断信心的一致性良好,Kappa值分别为0.874和0.917。结论CE-Boost技术和MBIR算法均能提高肥胖患者CTPA图像质量。CE-Boost技术在提高远端血管可视化方面具有更大的潜力。
Objective To evaluate the effects of model-based iterative reconstruction(MBIR)algorithm and contrast-enhancement boost(CE-boost)postprocessing technique on improving the image quality in CT pulmonary angiography(CTPA)of obese patients.Methods Sixty obese patients with body mass index>25 kg/cm^(2) and clinically suspected pulmonary embolism(PE)underwent CTPA examination and were randomly divided into hybrid iterative reconstruction(HIR),MBIR,and CE-boost groups.CT densities,image noise,signal-to-noise ratios(SNR)and contrast-to-noise ratios(CNR)of the main,right and left pulmonary arteries were assessed.Two radiologists independently scored subjectively the overall image quality and diagnostic confidence using the Likert 5-point scale method.Paired sample t test,Mann-Whitney U test and one-way analysis of variance were used for statistical analysis.Results The main pulmonary artery CT densities of CE-boost group[(510.87±141.20)HU]were significantly(P<0.05)higher than that of HIR[(354.31±93.74)HU]and MBIR[(350.79±88.43)HU]groups.The main pulmonary artery image noise in HIR group(16.60±3.03)was significantly(P<0.05)lower than that in CE-boost(24.63±4.96)and MBIR(22.80±2.94)groups.The SNR and CNR of the main,left and right pulmonary arteries in MBIR and CE-boost groups were higher than those in HIR group.The subjective scores of MBIR and CE-boost groups were higher than that of HIR group with the overall image quality increased from 4(3,4)to 5(4,5),and the diagnostic confidence increased from 3(3,4)to 4(4,5)points(all P<0.05).In the subjective analysis,there was good inter-observer agreement on overall image quality(κ=0.874)and diagnostic confidence(κ=0.917).Conclusion Both the CE-boost and MBIR methods can improve the image quality of CTPA in obese patients.CE-boost had greater potential in increasing the visualization of distal vessels.
作者
叶梅
邢艳
侯娟
赵梓程
徐敏
刘文亚
YE Mei;XING Yan;HOU Juan;ZHAO Zicheng;XU Min;LIU Wenya(Imaging Center,First Affiliated Hospital of Xinjiang Medical University,Xinjiang 830054,China)
出处
《影像诊断与介入放射学》
2024年第1期25-30,共6页
Diagnostic Imaging & Interventional Radiology
