冠状动脉CT血管造影的临床应用

在冠状动脉无创成像技术中,冠状动脉CT血管造影（cornary CT angiography,CCTA）已广泛应用于临床.CCTA通过血管注入对比剂,行多层螺旋CT心血管造影,再通过后处理达到清晰显示冠状动脉血管细节的目的,具有无创和操作简便的特点,对于血管变异、血管疾病以及显示病变和血管关系有重要价值,对冠状动脉狭窄诊断准确性高.本文回顾近年国内外的一些临床研究,综述了CCTA诊断性检查在临床中的应用.     

疑诊冠状动脉性心脏病患者冠状动脉CT检查后吸烟及用药情况的改变

目的 探讨疑诊冠状动脉性心脏病(简称"冠心病")患者行冠状动脉CT血管成像(coronary computed tomography angiography,CCTA)检查对其吸烟和主要用药情况的影响.方法 纳入2017年2月至2018年7月门诊疑诊冠心病行CCTA检查并完成随访的连续患者2077例,记录患者检查前后吸...     

冠状动脉慢性完全闭塞病变计算机断层扫描血管成像的形态学特征

目的分析冠状动脉慢性完全闭塞病变(chronic total occlusion,CTO)在双源计算机断层扫描(computed tomography,CT)血管成像上的形态学特点,并评估具有指导经皮冠状动脉介入(percutaneous coronary intervention,PCI)治疗价值的形态学特征。方法回顾性分析经冠状动脉造影(coronary angiography,CAG)证实为CTO病变患者的术前冠状动脉CT血管成像(coronary computed tomography angiography,CCTA)影像资料。评估并记录CCTA上所显示的各形态学指标,包括病变位置、闭塞血管长度、闭塞段血管近端呈钝形、闭塞段血管出现钙化;与CAG结果相比较,分析两者间显示的差异。结果 80例患者(82个CTO病变)CCTA结果显示82支血管闭塞,CCTA诊断CTO病变的敏感度为95.12%,特异度为97.14%;冠状动脉CTO病变45例(54.88%)位于右冠状动脉,CCTA测量闭塞段长度显著小于CAG测量所得,差异具有统计学意义[(28.29±14.15)mm vs.(38.90±23.48)mm,P0.001]。CCTA显示闭塞段血管近端呈钝形19例(23.17%),与CAG对照一致。CCTA显示58个(70.73%)CTO病变闭塞段血管内可见点状、结节状、条片状钙化灶,而CAG显示闭塞段血管存在钙化55个(67.07%),两者间比较差异无统计学意义(P0.05)。结论双源CT诊断冠状动脉CTO病变有较高敏感度及特异度,且可以显示闭塞段长度,近端形态及闭塞段钙化等有利于指导PCI治疗的形态学特征。     

平板运动试验与冠状动脉CT血管造影对冠心病的诊断价值

目的 研究平板运动试验(treadmill exercise test,TET)与冠状动脉CT血管造影(co-ronary computed tomographic angiography,CCTA)对冠心病的诊断价值.方法 选取我院118例可疑冠心病患者作为研究对象,1个月内均在我院行TET、CCTA和冠状动脉造影(...     

CCTA诊断冠状动脉支架内再狭窄的价值及再狭窄相关因素分析

目的评价冠状动脉CT血管造影(CCTA)在诊断冠状动脉支架植入术后支架内再狭窄的价值,并对再狭窄支架方面的相关因素进行分析。方法对106例冠状动脉支架植入术后患者,分别行CCTA及冠状动脉造影(CAG)检查,将CAG的诊断结果作为金标准,评估CCTA诊断支架内再狭窄的灵敏度、特异度,并分析支架内再狭窄是否与支架部位、直径、长度及类型有关。结果 (1) CCTA对106例患者的174枚支架内再狭窄的诊断特异度、灵敏度、阴性预测值、阳性预测值分别是97. 3%、91. 7%、98. 6%、84. 6%,与CAG的诊断一致性较高(Kappa=0. 860)。(2)支架内再狭窄与支架直径、狭窄性病变是否处于血管分叉处有关,与支架长度、支架所在冠脉节段、支架类型无关。结论 CCTA对冠状动脉支架内再狭窄的诊断结果与CAG的诊断结果存在较高的一致性。支架内再狭窄的形成与支架直径及狭窄性病变是否处于血管分叉处有关。     

功能性心肌血流指数评价缺血性冠心病可行性分析

目的:运用功能性心肌血流指数(MBFI)评价缺血性冠心病(ICAD)可行性分析.方法:回顾性分析冠心病疑似患者行冠状动脉CT血管成像(CCTA)检查,同期接受有创冠状动脉造影(ICA)及导管法心肌血流储备分数(FFR)检查共81例患者,其中男性43例,女性38例,年龄(59.27±9.09)岁;计算MBFI;以FFR≤...     

320排动态容积CT冠状动脉成像对胸痛患者的诊断价值

目的探讨320排动态容积CT冠状动脉成像对胸痛患者冠状动脉狭窄病变及斑块性质的诊断价值。方法对38例因胸痛住院患者先行冠状动脉CT血管造影（CCTA）检查,其中符合冠心病诊断的30例患者于2周内再行冠脉造影（CAG）检查,分析CCTA对冠脉狭窄病变的诊断价值;将冠心病患者分为稳定性心绞痛（SAP）组和急性冠脉综合征（ACS）组,根据不同CT值,将冠状动脉斑块分为软斑块、混合斑块、钙化斑块3类,观察3类斑块在两组患者中的不同构成。结果以CAG为金标准,CCTA对冠脉狭窄诊断的敏感性为91.84%,特异性97.83%,阳性预测值93.75%,阴性预测值97.12%,正确率96.26%,两种检查方法在诊断冠状动脉狭窄病变上差异无统计学意义;两种检查方法对冠脉狭窄程度的判断具有较好一致性（Kappa值=0.829）;ACS患者以软斑块为主（55.9%）,而SAP患者以钙化斑块为主（65%）,差异有统计学意义。结论 CCTA能准确诊断有意义的冠状动脉狭窄病变,且对冠状动脉斑块性质的判断有一定意义,CT值较低的软斑块与ACS有联系。     

第3代双源CT对青年疑诊冠心病患者冠状动脉病变的回顾性分析

目的:探讨冠状动脉CT造影成像对疑诊冠心病青年门诊患者的筛查情况并分析冠状动脉(冠脉)病变的危险因素.方法:选取2019年1月-2019年12月就诊于我院门诊行冠脉CT的疑诊冠脉病变的青年患者(≤45岁),根据冠脉CT评价其冠脉情况,记录临床资料,分析其临床危险因素与冠脉病变的关系.结果:①冠脉钙化积分(CACS)为0...     

冠状动脉CT造影的深度学习对冠心病的诊断价值

目的:评价人工智能(AI)在冠状动脉CT血管造影(CCTA)对冠心病的诊断价值.方法:对2020年6月至12月,先后行CCTA和有创冠状动脉造影(ICA)的150例患者进行回顾性分析.100例患者的CCTA图像作为训练数据集,使用卷积神经网络(CNN)进行训练,识别斑块类型和冠状动脉狭窄程度.另外50例CAD患者作为测...     

左回旋支异常起源的影像学表现及临床意义

目的:探讨成人冠状动脉CT血管成像及冠状动脉造影发现的左回旋支异常起源的冠状动脉影像学分类及其临床意义.方法:回顾性分析从16852例冠状动脉CT血管成像及10467例冠状动脉造影检查病例中获得的65例左回旋支异常起源病例的影像学和临床资料,分析左回旋支异常起源的解剖学特点及引起的胸痛、心绞痛、心律失常等临床特点.结果...     

冠状动脉血流储备分数位于灰区的老年冠心病患者不同治疗策略

目的研究冠状动脉(冠脉)血流储备分数(FFR)测值位于灰色区域(0.75≤FFR≤0.80)的75岁及以上慢性冠脉综合征患者选择保守治疗或冠脉介入治疗(PCI)对症状和预后的影响。方法回顾性研究,入选2011年1月至2017年12月在我院行FFR检查的75岁以上冠心病(至少1支主要冠脉狭窄50%~90%)患者96例,且行FFR检查结果为0.75≤FFR≤0.80,根据治疗方法分为接受优化药物治疗(保守组35例)和PCI治疗(PCI组61例),随访记录其术后1年心绞痛改善程度(西雅图心绞痛评分量表)和复合终点事件(死亡、心肌梗死、卒中和再次血运重建)发生率。结果保守组和PCI组患者基线资料包括年龄、性别和并存疾病比较差异无统计学意义(均P>0.05);PCI组患者既往心肌梗死史、基线低密度脂蛋白胆固醇水平高于保守组患者(均P<0.05)。随访1年结果显示,保守组患者西雅图心绞痛评分(77.6±19.5)分与PCI组(83.1±22.8)分比较,差异无统计学意义(P>0.05);复合终点事件发生率为11.4%(4/35)比9.8%(6/61),差异亦无统计学意义(P>0.05);但PCI组患者再次靶血管血运重建发生率1.6%(1例)低于保守组5.8%(2例),差异有统计学意义(P<0.05)。结论75岁以上高龄老年冠心病患者,FFR测值位于0.75~0.8的灰区,优化药物治疗对于心绞痛症状改善的效果和PCI相似,且1年复合终点事件未见明显增加。     

QFR Versus FFR Derived From Computed Tomography for Functional Assessment of Coronary Artery Stenosis

ObjectivesThe aim of this study was to compare diagnostic performance between quantitative flow ratio (QFR) derived from coronary angiography and fractional flow reserve derived from computed tomography (FFR_CT) using fractional flow reserve (FFR) as the reference standard.BackgroundQFR and FFR_CT are recently developed, less invasive techniques for functional assessment of coronary artery disease.MethodsQFR, FFR_CT, and FFR were measured in 152 patients (233 vessels) with stable coronary artery disease.ResultsQFR was highly correlated with FFR (r = 0.78; p < 0.001), whereas FFR_CT was moderately correlated with FFR (r = 0.63; p < 0.001). Both QFR and FFR_CT showed moderately good agreement with FFR, presenting small values of mean difference but large values of root mean squared deviation (FFR-QFR, 0.02 ± 0.09; FFR-FFR_CT, 0.03 ± 0.11). The sensitivity, specificity, positive predictive value, and negative predictive value of QFR ≤0.80 for predicting FFR ≤0.80 were 90%, 82%, 81%, and 90%, respectively. Those of FFR_CT ≤0.80 for predicting FFR ≤0.80 were 82%, 70%, 70%, and 82%, respectively. The diagnostic accuracy of QFR ≤0.80 for predicting FFR ≤0.80 was 85% (95% confidence interval [CI]: 81% to 89%), whereas that of FFR_CT ≤0.80 for predicting FFR ≤0.80 was 76% (95% CI: 70% to 80%).ConclusionsQFR and FFR_CT showed significant correlation with FFR. Mismatches between QFR and FFR and between FFR_CT and FFR were frequent.     

单一影像与融合影像对比评价2型糖尿病冠状动脉病变对心肌血供影响的研究

目的:比较单一影像即核素心肌灌注显像(MPI)与融合影像即MPI/冠状动脉(冠脉)计算机断层摄影术(CT)成像(CCTA)技术,评价2型糖尿病冠脉病变对心肌血供的影响及两种影像技术的诊断效能。方法:确诊2型糖尿病且怀疑或确诊合并冠心病85例,1个月内均行常规二日法腺苷负荷/静息MPI和冠脉造影,其中38例利用单光子发射计算机断层摄影术/CT,完成同机CCTA即MPI、MPI/CCTA。MPI采用心肌17分段5级评分法,及负荷总评分(SSS)对心肌血供做定性及半定量评价;冠脉造影和CCTA按常规将冠脉病变程度分为正常;轻、中、重度;以冠脉造影、冠脉造影联合MPI为参考标准评价MPI、MPI/CCTA融合影像诊断致心肌血供异常的冠脉病变的效能。结果:85例患者,MPI提示正常/异常为22/63例;MPI的诊断效能为:敏感性、特异性、准确性、阳性预测值和阴性预测值分别为80.19%、88.59%、85.10%、83.33%和86.27%;轻度20例(24%),中度12例(14%),严重31例(36%)。38例完成同机CCTA的患者中,以冠脉造影、冠脉造影联合MPI为对照标准,单一的MPI与MPI/CCTA融合影像评价2型糖尿病冠脉病变与心肌血供关系的敏感性、特异性、准确性、阳性预测值和阴性预测值分别为74.55%与96.97%、81.36%与91.67%、78.07%与94.74%、78.85%与94.12%和77.42%与95.65%。MPI/CCTA融合影像示:正常40.35%[46/114(段/支)],中度以上狭窄冠脉59.65%[68/114(段/支)]。结论:MPI/CCTA融合影像评价2型糖尿病冠脉病变对心肌血供影响的效能明显高于单一MPI,对2型糖尿病早期冠心病诊断有重要临床价值。     

血流储备分数在指导冠状动脉多支病变治疗策略中的作用

目的评估冠状动脉造影筛选的冠状动脉多支病变与心肌缺血的关系,阐明血流储备分数（FFR）在指导冠状动脉多支病变治疗策略中的作用。方法纳入96例患者218处冠状动脉病变,根据FFR值分为两组,FFR〉0．80组（113处）及FFR≤0．80组（105处）。结果FFR≤0．80组冠状动脉直径狭窄程度更高[（66．2±10．5）％比（59．1±13．8）％,P〈0．001]、面积狭窄百分比更大[（87．3±7．7）％比（81．44-10．9）％,P〈0．001]、最小管腔直径更小[（0．86±0．36）mm比（1．18±0．49）mm,P〈0．001],上述指标与FFR值无明确相关（相关系数分别为r=-0．286,P〈0．001;r=-0．282,P〈0．001）。冠状动脉最小管腔直径与FFR值呈正相关（r=0．364,P〈0．001）。冠状动脉造影筛选的96例患者中,26例为三支病变,70例为双支病变;经FFR测量后,缺血相关的三支病变10例,两支病变29例,单支病变17例。QCA冠状动脉造影直径狭窄i〉70％,FFR〉0．80的病变为21处（9．6％）;QCA冠状动脉造影直径狭窄〈70％,FFR≤0．80的病变为53处（24．3％）。QCA冠状动脉造影直径狭窄1〉70％,FFR~〈0．80的病变为52处（23．9％）（Matches）;QCA冠状动脉造影直径狭窄〈70％,FFR〉0．80的病变为92处（42．2％）（Matches）。QCA冠状动脉造影面积狭窄I〉70％,FFR〉0．80的病变为89处（40．8％）（Mismatches）;QCA冠状动脉造影面积狭窄≥70％,FFR≤0．80的病变为105处（48．2％）（Matches）;QCA冠状动脉造影面积狭窄〈70％,FFR〉0．80的病变为24处（11．0％）（Matches）。结论FFR在指导冠状动脉多支病变治疗策略中具有重要意义,可显著降低缺血相关靶病变个数。     

血流储备分数与冠状动脉造影指导不稳定型心绞痛患者临界病变介入治疗效果的比较

目的 分析血流储备分数（FFR）与冠状动脉造影（CAG）指导的不稳定型心绞痛患者临界病变介入治疗的效果.方法 回顾性分析2012年9月1日至2013年9月30日在北京大学人民医院心脏中心行CAG显示为临界病变且行FFR检查的不稳定型心绞痛患者,共收集41例患者的50处血管病变,与同时期行CAG的不稳定型心绞痛临界病变病例进行1：3匹配,分析其随访期间的主要不良心血管事件（包括心绞痛无缓解、再次靶血管血运重建、非致死性心肌梗死和心源性死亡）.结果 FFR介入治疗组共21例25处血管病变;FFR药物治疗组共20例25处血管病变;CAG介入治疗组共63例75处血管病变;CAG药物治疗组共60例75处血管病变.FFR介入治疗组术后的FFR平均值为（0.86±0.07）,有4例4处血管（16％）的术后FFR≥0.94,达到了介入治疗结果理想的标准;有13例17处血管（68％）的术后FFR在0.80～0.94的可接受范围内;其余4例4处血管（16％）的术后FFR＜0.80.FFR指导治疗的2组病例和CAG指导治疗的2组病例术后总的主要不良心血管事件（包括死亡、非致死性心肌梗死、再次靶血管血运重建和心绞痛缓解情况）差异有统计学意义（P=0.000）.在随访过程中4组均无心源性死亡病例,非致死性心肌梗死的发生率在各组间的差异无统计学意义.心绞痛缓解情况在FFR指导治疗的两组中最为明显,明显缓解的比例高于CAG指导治疗的两组,而明显缓解＋部分缓解的比例达到了100％,也高于CAG指导治疗的两组（P=0.002）,差异有统计学意义.再次靶血管血运重建的情况在FFR指导治疗的两组中也明显低于CAG指导治疗的两组,尤其是FFR药物治疗组无再次靶血管血运重建事件发生.而CAG药物治疗组在随访过程中由于心绞痛无明显缓解等原因再次行靶血管血运重建的比例最高（P=0.008）,差异有统计学意义.结论 采用FFR检查可以准确的识别不稳定型心绞痛患者临界病变是否缺血,用于指导介入治疗可以降低术后的主要不良心血管事件.     

Cardiac computed tomography guided treatment strategy in patients with recent acute-onset chest pain : Results from the randomised,controlled trial: CArdiac cT in the treatment of acute CHest pain (CATCH)

Objectives

In patients admitted on suspicion of acute coronary syndrome, with normal electrocardiogram and troponines, we evaluated the clinical impact of a Coronary CT angiography (CCTA)-strategy on referral rate for invasive coronary angiography (ICA), detection of significant coronary stenoses (positive predictive value [PPV]) and subsequent revascularisations, as compared to a function-based strategy (standard care). Secondarily we assessed intermediate term clinical events.

Methods and results

We randomised 600 patients to a CCTA-guided strategy (299 patients) or standard care (301 patients). In the CCTA-guided group referral for ICA required a coronary stenosis > 70% or > 50% in the left main, and for intermediate stenoses (50–70%), a stress test was used. A significant stenosis on ICA was defined as a stenosis ≥ 70% or reduced FFR ≤ 0.75 in intermediate stenoses (50–70%). Referral rate for ICA was 17% with CCTA vs. 12% with standard care (p = 0.1). ICA confirmed significant coronary artery stenoses in 12% vs. 4% (p = 0.001), and 10% vs. 4% were subsequently revascularised (p = 0.005). PPV for the detection of significant stenoses was 71% with CCTA vs 36% with standard care (p = 0.001). Clinical events (cardiac death, myocardial infarction, unstable angina pectoris, revascularisation and readmission for chest pain), during 120 days of follow-up, were recorded in 8 patients (3%) in the CCTA-guided group vs. 15 patients (5%) in the standard care group (p = 0.1).

Conclusion

In patients with recent acute-onset chest pain, a CCTA-guided diagnostic strategy improves PPV for the detection of significant coronary stenoses, and increases the frequency of revascularisations, when compared to a conventional functional approach.     

Prognostic Implications of Plaque Characteristics and Stenosis Severity in Patients With Coronary Artery Disease

BackgroundAlthough the presence of ischemia is a key prognostic factor in patients with coronary artery disease, the presence of high-risk plaque characteristics (HRPC) is also associated with increased risk of cardiovascular events. Limited data exist regarding the prognostic implications of combined information on physiological stenosis severity assessed by fractional flow reserve (FFR) and plaque vulnerability by coronary computed tomography angiography (CTA)–defined HRPC.ObjectivesThe current study aimed to evaluate the: 1) association between physiological stenosis severity and coronary CTA-defined HRPC; and 2) prognostic implications of coronary CTA-defined HRPC according to physiological stenosis severity in patients with coronary artery disease.MethodsA total of 772 vessels (299 patients) evaluated by both coronary CTA and FFR were analyzed. The presence and number of HRPC (minimum lumen area <4 mm², plaque burden ≥70%, low attenuating plaque, positive remodeling, napkin-ring sign, or spotty calcification) were assessed using coronary CTA images. The risk of vessel-oriented composite outcome (VOCO) (a composite of vessel-related ischemia-driven revascularization, vessel-related myocardial infarction, or cardiac death) at 5 years was compared according to the number of HRPC and FFR categories.ResultsThe proportion of lesions with ≥3 HRPC was significantly decreased according to the increase in FFR values (58.6%, 46.5%, 36.8%, 15.7%, and 3.5% for FFR ≤0.60, 0.61 to ≤0.70, 0.71 to ≤0.80, 0.81 to ≤0.90, and >0.90, respectively; overall p value <0.001). Both FFR and number of HRPC showed significant association with the estimated risk of VOCO (p = 0.008 and p = 0.023, respectively). In the FFR >0.80 group, lesions with ≥3 HRPC showed significantly higher risk of VOCO than those with <3 HRPC (15.0% vs. 4.3%; hazard ratio: 3.964; 95% confidence interval: 1.451 to 10.828; p = 0.007). However, there was no significant difference in the risk of VOCO according to HRPC in the FFR ≤0.80 group. By multivariable analysis, the presence of ≥3 HRPC was independently associated with the risk of VOCO in the FFR >0.80 group.ConclusionsPhysiological stenosis severity and the number of HRPC were closely related, and both components had significant association with the risk of clinical events. However, the prognostic implication of HRPC was different according to FFR. Integration of both physiological stenosis severity and plaque vulnerability would provide better prognostic stratification of patients than either individual component alone, especially in patients with FFR >0.80. (Clinical Implication of 3-vessel Fractional Flow Reserve [3V FFR-FRIENDS study]; NCT01621438)     

Measurement of fractional flow reserve in patients with multi-vessel coronary artery disease and borderline lesions prevents unnecessary revascularisation procedures

BACKGROUND: Patients with multi-vessel coronary artery disease (CAD) are selected for percutaneous coronary interventions (PCI) or surgical revascularisation. The appropriateness of "ad hoc" PCI of borderline lesions (<70% of lumen diameter) in patients with a multi-vessel CAD has not been proven. However, delayed PCI of another lesion and gaining additional information from non-invasive tests is not a widely accepted strategy. When left anterior descending (LAD) coronary artery is one of the affected vessels, selection for surgical revascularisation is most likely. AIM: To assess long-term outcome in patients with multi-vessel CAD and borderline lesions, including LAD, in whom fractional flow reserve (FFR) in all affected vessels was measured and used for selection for PCI or conservative treatment. METHODS: The study group consisted of 16 patients with stable angina (11 males, mean age 60+/-9 years) with 34 lesions localised in the main epicardial coronary arteries [LAD / left main (LM) / right coronary artery (RCA) / intermediate branch (IB) / circumflex artery (Cx) - 15/1/5/5/8] of which at least two were borderline stenoses. Each lesion underwent FFR measurement. "Ad hoc" PCI was performed when FFR was <0.75, and conservative therapy was instituted when FFR was >0.75. RESULTS: Of 34 lesions, in 8 (23%) the FFR value was <0.75 and these lesions were treated with PCI (LAD/IB/Cx - 3/2/3). In the remaining 26 (77%) lesions, FFR was >0.75 and conservative therapy was instituted. During the mean follow-up of 15+/-6 months (range 6-28 months, median 15 months) in 8 of 9 conservatively treated patients no aggravation of anginal symptoms nor other coronary events were observed. One patient developed acute myocardial infarction due to thrombus occluding a borderline LAD lesion. Of 8 lesions treated with PCI (baseline FFR = 0.63+/-0.10 vs post-PCI FFR = 0.92+/-0.08, p=0.0002), in one case an in-stent restenosis in LAD occurred 9 months after PCI. Of a total of 26 lesions which were conservatively treated (mean FFR 0.91+/-0.05), in 2 (7.7%) the progression of CAD was noted. CONCLUSIONS: In patients with multi-vessel CAD and borderline lesions, FFR measurement identifies those, who can be treated conservatively with a good long-term outcome, and prevents unnecessary PCI.     

Dynamic Myocardial Perfusion CT for the Detection of Hemodynamically Significant Coronary Artery Disease

ObjectivesIn this international, multicenter study, using third-generation dual-source computed tomography (CT), we investigated the diagnostic performance of dynamic stress CT myocardial perfusion imaging (CT-MPI) in addition to coronary CT angiography (CTA) compared to invasive coronary angiography (ICA) and invasive fractional flow reserve (FFR).BackgroundCT-MPI combined with coronary CTA integrates coronary artery anatomy with inducible myocardial ischemia, showing promising results for the diagnosis of hemodynamically significant coronary artery disease in single-center studies.MethodsAt 9 centers in Europe, Japan, and the United States, 132 patients scheduled for ICA were enrolled; 114 patients successfully completed coronary CTA, adenosine-stress dynamic CT-MPI, and ICA. Invasive FFR was performed in vessels with 25% to 90% stenosis. Data were analyzed by independent core laboratories. For the primary analysis, for each coronary artery the presence of hemodynamically significant obstruction was interpreted by coronary CTA with CT-MPI compared to coronary CTA alone, using an FFR of ≤0.80 and angiographic severity as reference. Territorial absolute myocardial blood flow (MBF) and relative MBF were compared using C-statistics.ResultsICA and FFR identified hemodynamically significant stenoses in 74 of 289 coronary vessels (26%). Coronary CTA with ≥50% stenosis demonstrated a per-vessel sensitivity, specificity, and accuracy for the detection of hemodynamically significant stenosis of 96% (95% CI: 91%-100%), 72% (95% CI: 66%-78%), and 78% (95% CI: 73%-83%), respectively. Coronary CTA with CT-MPI showed a lower sensitivity (84%; 95% CI: 75%-92%) but higher specificity (89%; 95% CI: 85%-93%) and accuracy (88%; 95% CI: 84%-92%). The areas under the receiver-operating characteristic curve of absolute MBF and relative MBF were 0.79 (95% CI: 0.71-0.86) and 0.82 (95% CI: 0.74-0.88), respectively. The median dose-length product of CT-MPI and coronary CTA were 313 mGy·cm and 138 mGy·cm, respectively.ConclusionsDynamic CT-MPI offers incremental diagnostic value over coronary CTA alone for the identification of hemodynamically significant coronary artery disease. Generalized results from this multicenter study encourage broader consideration of dynamic CT-MPI in clinical practice. (Dynamic Stress Perfusion CT for Detection of Inducible Myocardial Ischemia [SPECIFIC]; NCT02810795)