摘要
目的:探究能谱CT单能量成像技术对观察颈动脉粥样硬化图像质量的影响,评估最佳单能量水平。方法:回顾性分析本院收治的80例颈动脉粥样硬化患者的资料,均行颈动脉能谱CTA检查,经后处理获得单能量图像(40~140 keV,间隔10 keV)和常规120 kVp-like图像。测量并比较40~70 keV单能量图像和常规组的图像噪声,主动脉弓、双侧颈总动脉、双侧颈内动脉及非钙化斑块和钙化斑块的对比噪声比(Contrast to noise ratio,CNR),同时应用5分法对图像行主观评价;测量斑块短径和狭窄程度,对结果进行统计学分析。结果:随着能级减小,图像噪声、各支血管和斑块的CNR均呈增高趋势,在40 keV时达到最高。各支血管和斑块的CNR在40~70 keV高于常规120 kVp-like组,其中主动脉弓、颈总动脉和非钙化斑块的CNR在40~60 keV水平与常规120 kVp-like组比较有统计学意义,颈内动脉和钙化斑块则在40~50 keV水平(P均<0.05)。40~70 keV单能量图像主观评分均优于常规组,以60 keV单能量图像最佳(P<0.001)。低keV图像产生明显更高的钙化斑块短径/狭窄程度和更小的非钙化斑块短径/狭窄程度(P均<0.001)。结论:与120 kVp-like图像相比,低keV的单能量图像可获得更好的图像质量,但可导致颈动脉斑块大小及狭窄程度的改变,60 keV为显示颈部动脉粥样硬化的最佳单能级。
Objective:To explore the effect of spectral CT monochromatic image technique on the image quality of carotid atherosclerosis,and to evaluate the optimal monochromatic energy level.Methods:The data of 80 patients with carotid atherosclerosis in our hospital were retrospectively analyzed.All patients were examined by neck CT angiography on the spectral CT.Monochromatic energy images(40~140 keV,with 10 keV interval)and conventional 120 kVp-like images were obtained after post-processing.The image noise and contrast to noise ratio(CNR)of aortic arch,common carotid arteries,internal carotid arteries,non-calcified plaques and calcified plaques were measured and compared on 40~70 keV and conventional 120 kVplike images.Then the 5-point scoring method was applied for subjective evaluation.The short diameter and luminal narrowing of plaque were measured and the results were statistically analyzed.Results:With the decrease of energy level,the image noise and CNR of carotid artery and plaques showed a trend of increasing,and achieved the highest value at 40 keV.The CNR of each artery and plaque at the 40~70 keV monochromatic energy images was higher than conventional 120 kVp-like images.The CNR of aortic arch,common carotid artery and non-calcified plaque was statistically significant at the 40~60 keV monochromatic energy images compared with conventional 120 kVp-like images.The CNR of internal carotid artery and calcified plaque was at the 40~50 keV(both P<0.05).The subjective scores of 40~70 keV monochromatic energy images were better than those of conventional images,then the 60 keV monochromatic energy images demonstrated the best subjective scores(both P<0.001).In addition,low keV images yielded higher short diameters/stenosis of calcified plaques and smaller short diameters/stenosis of non-calcified plaque(both P<0.001).Conclusion:Compared with 120 kVp-like images,low energy images can obtain better image quality,but can result in differences in sizes of carotid plaques and the degree of stenosis.The optimal monochrom
作者
陈笑
季涛
王国华
高玉庆
黄小铭
CHEN Xiao;JI Tao;WANG Guo-hua;GAO Yu-qing;HUANG Xiao-ming(Department of Radiology,Qingdao Hospital,University of Health and Rehabilitation Sciences(Qingdao Municipal Hospital),Qingdao Shandong 266011,China)
出处
《中国临床医学影像杂志》
CAS
CSCD
2023年第10期719-723,共5页
Journal of China Clinic Medical Imaging
