The Study of the Image Quality of Dual Energy Spectral CT in the Assessment of Myocardial Infarction
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摘要: 目的:通过研究评价能谱CT(Spectral CT)成像功能参数的有效性,并探讨这些参数在评估局部梗死心肌图像质量中的临床应用价值。方法:收集我院30例冠心病患者,均在一次扫描中行宝石能谱CT常规冠脉CTA(CCTA)扫描模式和宝石能谱成像(GSI)扫描模式。患者均在一周内行心脏MRI扫描。常规混合能量图像上分析冠状动脉的狭窄程度。分别找出1 min和3 min单光子能量水平的图像上梗死心肌与正常心肌的最佳对比噪声比(optimal CNR)以及对应的最佳单能量值和此能量值的图像噪声值,通过单因数方差分析方法与常规混合能量图像的对比噪声比(CNR)和图像噪声值进行比较。在MRI心肌灌注图像上找出梗死心肌并与能谱CT进行相关性对比。结果:宝石能谱CT共检出梗死心肌36个区域,所有梗死心肌在CCTA图像上均有区域供血冠脉50%以上狭窄(71.7%±16.2%),并且找出的梗死心肌与MRI心肌灌注图像有较高的相关性(r=100%,P=0.00)。1 min、3 min单光子能量水平图像上最佳CNR值明显高于常规混合能量图像CNR值(P<0.05)。1 min、3 min最佳单能量值水平的图像噪声值均低于常规混合能量图像(P<0.05)。结论:能谱CT的GSI能谱成像模式较常规混合能量图像能够明显提高图像质量,从而提高了梗死心肌的检测效率。Abstract: Objective: To study the effectiveness of the functional parameters of spectral CT, and to explore their clinic values of image quality in the evaluation of myocardial infarction(MI), so as to provide a novel and reliable imaging diagnostic system for early detection of MI. Methods: 30 patients with coronary heart disease were scanned with the conventional coronary CT angiography(CCTA) and the dual energy spectral imaging modes. In addition, all cases had the Cardiac MRI scan within a week. CCTA images were used to measure stenoses. The optimal contrast-to-noise ratio(CNR) and the optimal monochromatic energy levels for displaying infractions were measured from 1 min and 3 min monochromatic images. Record the image noise according to the optimal monochromatic energy levels. The results were compared with those measured from conventional 140 k Vp polychromatic images. Detect MI in MRI perfusion images and compare with those detected by CT. Results: Spectral CT have detected 36 regions of MI and had good correlation with the myocardial perfusion images of MRI(r = 100%, P = 0.00). All spectral CT-identified MI had associated coronary artery with more than 50% stenosis of the intravascular diameter(71.7% ± 16.2%). The optimal CNR for displaying infractions of 1 min and 3 min monochromatic images were significant higher than the CNR of conventional 140 k Vp polychromatic images(P < 0.05). The image noise according to the optimal monochromatic energy levels of 1 min and 3 min monochromatic images were significant lower than conventional 140 k Vp polychromatic images(P < 0.05). Conclusions: The GSI mode of dual energy spectral CT greatly improves the image quality and the efficiency of the detection of MI.
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Keywords:
- spectral CT /
- MI /
- image quality /
- GSI /
- conventional coronary CT angiography
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期刊类型引用(3)
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3. 符熙，何伟红，谢乐，方挺松，陈少銮，梁振华. 64排螺旋CT后处理技术对回盲部病变的诊断价值. CT理论与应用研究. 2019(04): 499-504 . 本站查看
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