基于冠状动脉CT血管成像的无创血流储备分数的研究进展

基于冠状动脉CT血管成像的无创血流储备分数(FFRCT)能对冠状动脉的结构和功能做出非侵入性一体化评估.近年来随着计算机及人工智能技术的发展和进步,FFRCT软件不断更新并表现出了良好的诊断效能.最近研究表明FFRCT在冠心病诊疗中能指导血运重建策略的制定,预测临床结局及产生一定的成本效益.现就FFRCT的最新研究进展...     

冠状动脉CT血管造影评估冠状动脉功能性狭窄的研究进展

冠状动脉CT血管造影可评估冠状动脉解剖学狭窄程度,但不能准确地判断冠状动脉狭窄是否引起功能性心肌缺血.血流储备分数是评估功能性狭窄的金标准,但有创且费用昂贵,限制了其临床应用.近年来,用于评价冠状动脉功能性狭窄的冠状动脉CT血管造影分析技术包括:冠状动脉CT血流储备分数、生物力学特征、基于管腔内密度衰减的参数、冠状动脉...     

基于冠状动脉CT血管成像的冠状动脉生理学研究进展

冠状动脉CT血管成像（CCTA）是评价冠状动脉解剖学狭窄的重要手段，对冠状动脉粥样硬化性心脏病的诊断具有较高的阴性预测价值，但其不能准确地判断冠状动脉狭窄的生理学意义。近年来，国内外涌现出一系列基于CCTA的无创冠状动脉生理学评估手段，包括：基于CCTA的血流储备分数（CT-FFR）及其衍生指标、基于CCTA的瞬时无波形比值（iFRCT）等，有望实现冠状动脉功能学缺血程度与解剖学狭窄程度的一站式评估，对冠心病的早期筛查和精准诊疗具有重要意义。本文基于CCTA的冠状动脉生理学研究进展展开综述。     

冠状动脉CT血流储备分数研究进展

血流储备分数(FFR)是诊断冠状动脉功能性狭窄的金标准。冠状动脉电子计算机断层扫描血流储备分数(CT-FFR)是以冠状动脉CT血管成像数据为基础,重建冠状动脉三维结构后即可计算冠状动脉各处的FFR值。CT-FFR通过一次CT即可实现冠状动脉的解剖和功能学评价,具有重要的临床价值。临床研究证实了CT-FFR的诊断性能,并探索了其在临床决策、患者预后方面的价值。随着国产CT-FFR软件的问世,涌现了许多针对国产CT-FFR软件诊断性能的研究。该文介绍了CT-FFR的应用领域及其优缺点。     

无创CT血流储备分数的研究进展

冠状动脉CT血管造影(CCTA)是目前常用的冠心病无创诊断方法,但有一定的假阳性率,导致不必要的有创冠状动脉造影。CT血流储备分数(CT-FFR)是通过对CCTA图像的进一步处理和计算对缺血做出功能性诊断,多项研究已证实了其诊断稳定型冠心病的准确性及临床可行性和安全性,但也有一些不足和限制。     

冠状动脉CT造影的无创血流储备分数(FFR_(CT))在冠心病诊治中的研究进展

<正>目前临床上诊断冠心病最常用和最重要的方法是无创冠状动脉CT造影(coronary computed tomography angiography,CCTA)和有创的冠状动脉造影(invasive coronary angiography,ICA)。但二者仅能提供冠状动脉病变的解剖学信息,不能进行功能学评价。而临床上对冠状动脉病变的功能学评估(冠状动脉狭窄是否导致心肌缺血)决定了病变(特别是临界病     

冠状动脉斑块病变血流动力学及无创评估方法的研究现状

冠状动脉CT血管造影(CCTA)已被广泛用于检测或排除显著的冠心病,且CCTA已成为评价冠状动脉解剖结构最主要的无创检查方法;但常规CCTA图像仅提供冠状动脉解剖学的评估,其改善临床预后效果不明显。为了克服常规CCTA的缺点,冠状动脉功能学的CT无创评估技术逐渐成熟,以CCTA图像为基础的冠状动脉血流动力学研究已成为热点。现主要对局部流体力学与冠状动脉粥样硬化的形成及进展的关系进行综述,并对CT心肌灌注及CT无创计算冠状动脉血流储备分数(FFR)进行阐述,为CT功能学无创评估方法对心肌缺血及冠状动脉粥样硬化性心脏病预后检测提供参考依据。     

冠状动脉CT血管成像狭窄评分定量评估缺血相关病变的临床价值

目的:分析冠状动脉CT血管成像狭窄评分(CCTA-SS)在定量评估缺血相关病变中的临床价值.方法:回顾性分析经冠状动脉CT血管成像(CCTA)诊断为左前降支单支病变的冠状动脉粥样硬化性心脏病(冠心病)疑似患者的临床资料.患者入院1周内接受有创冠状动脉造影(ICA)及血流储备分数(FFR)检查,分析影像特征并计算CCTA...     

冠脉CTA评估糖尿病冠状动脉疾病的研究进展

糖尿病患者更易罹患冠状动脉疾病, 如血管钙化、斑块、狭窄, 或是血流储备能力下降, 心肌灌注不足。近年来, 冠脉CT血管成像技术取得了巨大进步, 解剖学上可以评估冠状动脉的钙化、狭窄、斑块、心外膜脂肪, 功能学上可以评估冠状动脉的血流储备分数和心肌灌注成像, 提供血流动力学信息。通过CT技术全面、准确、综合的评价冠状动脉的解剖和功能特征, 有利于筛查出高危患者, 减少不良事件的发生, 这对糖尿病冠状动脉疾病的防治具有重要意义。     

动态CT心肌灌注显像与CT血流储备分数对冠心病诊断价值的比较

目的 分析动态CT心肌灌注显像（CTP）对功能性显著狭窄冠心病的诊断价值,比较两种定量分析指标[心肌血流量（MBF）比值与心肌血流储备（MFR）比值]评判心肌灌注显像结果的准确性,并比较CTP与冠状动脉CT血流储备分数（CT-FFR）对功能性显著狭窄冠心病的诊断价值。方法 对疑似冠心病的患者行冠状动脉CT血管造影（CCTA）和CTP检查。CCTA图像采集后行CT-FFR检测,CTP在静息相、腺苷三磷酸（ATP）诱导负荷相采集图像,用西门子CT灌注软件进行图像分析。所有患者均接受有创冠状动脉造影（ICA）检查,并进一步行定量血流分数（QFR）检测以作为参考标准。利用负荷状态各节段的MBF与最大值比值算得的MBF比值以及由各节段负荷相与静息相MBF比值算得的MFR与所有节段平均值的比值得到的MFR比值,两种CTP的定量指标评估冠状动脉狭窄所致的心肌缺血,CT-FFR评估各支冠状动脉功能性狭窄的情况。通过分析各种评估方式的受试者工作特征曲线,计算敏感度、特异度、准确度等诊断效能指标以及与QFR结果的一致性,对各评估方式进行比较。结果 研究共纳入48例患者,分析132支血管,其中男23例,平均...     

Fractional flow reserve‐CT assessment of coronary stenosis

Coronary computed tomography angiography (CCTA) has been an established noninvasive method for detection of coronary artery disease (CAD). Although CCTA has had a high sensitivity and negative predictive value for CAD detection, specificity for obstructive CAD has been relatively low, partly due to coronary calcium, imaging artifacts, and other factors leading to an overestimation of stenosis severity. A relatively new noninvasive method of calculation of fractional flow reserve (FFR) using CCTA (FFR_CT) data has been developed. This noninvasive method yields similar results to invasive FFR measurement, improving specificity for noninvasively detecting lesion‐specific ischemia thus helping guide revascularization.     

FFR-CT strengthens multi-disciplinary reporting of CT coronary angiography

The utility of computed tomography (CT) coronary angiography (CTCA) is underpinned by its excellent sensitivity and negative-predictive value for coronary artery disease (CAD), although it lacks specificity. Invasive coronary angiography (ICA) and invasive fractional flow reserve (FFR), are gold-standard investigations for coronary artery disease, however, they are resource intensive and associated with a small risk of serious complications. FFR-CT has been shown to have comparable performance to FFR measurements and has the potential to reduce unnecessary ICAs. The aim of this study is to briefly review FFR-CT, as an investigational modality for stable angina, and to share ‘real-world’ UK data, in consecutive patients, following the initial adoption of FFR-CT in our district general hospital in 2016.A retrospective analysis was performed of a previously published consecutive series of 157 patients referred for CTCA by our group in a single, non-interventional, district general hospital. Our multi-disciplinary team (MDT) recorded the likely definitive outcome following CTCA, namely intervention or optimised medical management. FFR-CT analysis was performed on 24 consecutive patients where the MDT recommendation was for ICA. The CTCA + MDT findings, FFR-CT and ICA ± FFR were correlated along with the definitive outcome.In comparing CTCA + MDT, FFR-CT and definitive outcome, in terms of whether a percutaneous coronary intervention was performed, FFR-CT was significantly correlated with definitive outcome (r=0.471, p=0.036) as opposed to CTCA + MDT (r=0.378, p=0.07). In five cases (21%, 5/24), FFR-CT could have altered the management plan by reclassification of coronary stenosis. FFR-CT of 60 coronary artery vessels (83%, 60/72) (mean FFR-CT ratio 0.82 ± 0.10) compared well with FFR performed on 18 coronary vessels (mean 0.80 ± 0.11) (r=0.758, p=0.0013).In conclusion, FFR-CT potentially adds value to MDT outcome of CTCA, increasing the specificity and predictive accuracy of CTCA. FFR-CT may be best utilised to investigate CTCAs where there is potentially prognostically significant moderate disease or severe disease to maximise cost-effectiveness. These data could be used by other NHS trusts to best incorporate FFR-CT into their diagnostic pathways for the investigation of stable chest pain.