Comparison of 16 slice multi-detector computed tomography and breath hold 3D magnetic resonance angiography in the detection of coronary stenosis

Objective To compare 16-slice multi-detector spiral computed tomography (MDCT) and breathhold 3D magnetic resonance (MR) coronary angiography in the visualization of coronary arteries and the accuracy of detecting significant (＞ 50%) coronary stenoses in patients with suspected coronary artery disease. Methods Forty patients were examined by 16-slice CT (GE, Lightspeedl6)and MR (GE,Twinspeed) within 3 days; 31 of them underwent conventional coronary angiography (CAG) within 2 weeks after CT and MR scan. CT was performed with 16× 1.25 mm detector collimation, 0.5 s rotation time and images were reconstructed at 60%-75% of the cardiac cycle. MR was performed with breath hold 3D FIESTA (TR4.0 ms, TE1.7 ms, flip angle 65, slice thickness 3 mm, FOV 280 mm, matrix 256× 192). Mean heart rate was 63 ± 5.8 bpm and β-blocker was used in 24 patients. MR and CT image quality was evaluated in 9 coronary segments (RCA1, RCA2, RCA3, LM, LAD1, LAD2, LAD3, LCX1, LCX2) using a four-point grading scale.Sensitivity, specificity, positive predictive value, negative predictive value and accuracy were calculated for detection of significant stenosis using CAG as the gold standard. Results 16-slice CT showed higher image quality in most coronary segments except RCA2.Forty-three segments were diagnosed as significant stenosis by CAG, 36 and 27 of these were correctly detected by CT and MR respectively. Sensitivity, specificity, positive predictive value, and negative predictive value of 16-slice CT and MR for detecting significant stenosis were 83 %, 84 %, 49 %, 97 % and 63 %, 90 %, 55 %, 93 %, respectively. Conclusion Sixteen-slice CT showed higher image quality in most coronary segments excepted for middle RCA. 16-slice CT had higher sensitivity than MR for detection of coronary significant stenosis, whereas MR had higher specificity than CT. Both CT and MR showed high negative predictive value,which is useful for excluding coronary stenosis in symptomatic patients.

Diagnostic Accuracy of Three-Dimensional Whole-Heart Magnetic Resonance Angiography to Detect Coronary Artery Disease with Invasive Coronary Angiography as a Reference:A Meta-Analysis

Objective:We aimed to evaluate the diagnostic performance of three-dimensional whole-heart magnetic resonance coronary angiography(MRCA)in detecting coronary artery disease(CAD)with invasive coronary angiography as the reference standard.Methods:We searched PubMed and Embase for studies evaluating the diagnostic performance of three-dimensional whole-heart MRCA for the diagnosis of CAD with invasive coronary angiography as the reference standard.The bivariate mixed-effects regression model was applied to synthesize available data.The clinical utility of whole-heart MRCA was calculated by the posttest probability based on Bayes’s theorem.Results:Eighteen studies were included,of which 16 provided data at the artery level.Patient-based analysis revealed a pooled sensitivity of 0.90(95%confi dence interval[CI]0.87–0.93)and specifi city of 0.79(95%CI 0.73–0.84),while the pooled estimates were 0.86(95%CI 0.82–0.89)and 0.89(95%CI 0.84–0.92),respectively,at the artery level.The areas under the summary receiver operating characteristic curve were 0.93(95%CI 0.90–0.95)and 0.92(95%CI 0.90–0.94)at the patient and artery levels,respectively.With a pretest probability of 50%,the patients’posttest probabilities of CAD were 81%for positive results and 11%for negative results.Conclusions:Whole-heart MRCA can be an alternative noninvasive method for diagnosis and assessment of CAD.

Contribution of cardiovascular magnetic resonance in the evaluation of coronary arteries

Cardiovascular magnetic resonance(CMR) allows the nonradiating assessment of coronary arteries; to achieve better image quality cardiorespiratory artefacts should be corrected. Coronary MRA(CMRA) at the mo-ment is indicated only for the detection of abnormal coronary origin, coronary artery ectasia and/or aneu-rysms(class Ⅰ indication) and coronary bypass grafts(class Ⅱ indication). CMRA utilisation for coronary ar-tery disease is not yet part of clinical routine. However, the lack of radiation is of special value for the coronary artery evaluation in children and women. CMRA can assess the proximal part of coronary arteries in almost all cases. The best results have been observed in the evaluation of the left anterior descending and the right coronary artery, while the left circumflex, which is lo-cated far away from the coil elements, is frequently im-aged with reduced quality, compared to the other two. Different studies detected an increase in wall thickness of the coronaries in patients with type Ⅰ diabetes and abnormal renal function. Additionally, the non-contrast enhanced T1-weighed images detected the presence of thrombus in acute myocardial infarction. New tech-niques using delayed gadolinium enhanced imaging promise the direct visualization of inflamed plaques in the coronary arteries. The major advantage of CMRis the potential of an integrated protocol offering as-sessment of coronary artery anatomy, cardiac function, inflammation and stress perfusion-fibrosis in the same study, providing an individualized clinical profile of pa-tients with heart disease.

Magnetic Resonance Imaging of Coronary Arteries:Latest Technical Innovations and Clinical Experiences

Cardiovascular disease(CVD)is the leading cause of death and a major health care challenge globally.Coronary artery disease(CAD)is a primary underlying pathological process in the majority of cardiovascular disease cases.Magnetic resonance imaging(MRI)can play a potentially important role in the management of CAD as a noninvasive imaging modality without ionizing radiation,although its early promise has not been delivered because of several crucial technical limitations.However,recent innovations in MRI have reopened the door,with tremendous opportunities for multiparametric assessment of CAD including luminal stenosis,plaque burden and composition,and disease activities such as infl ammation and hemorrhage.Novel MRI acquisition and reconstruction strategies now offer much increased spatial resolution and image quality and shortened examination times compared with conventional approaches.Recent clinical experiences of coronary MRI indicated the potential to improve the current management of coronary atherosclerosis,such as identifying the patients at the highest risk and evaluating therapeutic responses.In this review we discuss the latest technical advances and clinical insights in coronary MRI.

Cardiac magnetic resonance in patients with acute cardiac injury and unobstructed coronary arteries

AIM To define the role of cardiac magnetic resonance(CMR) by analyzing a particular group of patients with suspected acute coronary syndrome(ACS) and normal coronary angiogram. METHODS From January 2009 to December 2015, we examined 220 patients with clinical suspicion of ACS, Troponin elevation [the threshold used to define a positive Troponin T test(TnT) was 0.1 ng/mL ] and no significant coronary disease at angiography(the patients were considered to have significant angiographic disease only a 50% stenosis was detected in any of their coronary arteries). The role of CMR with the late gadolinium enhancement was evaluated.RESULTS CMR was performed to 190 patients(86%) of this group which reveals: Myocarditis in 90 patients(47%); apical ballooning(Tako-Tsubo syndrome) in 32 patients(17%); myocardial infarction(MI) in 40 patients(21%) and no clear diagnosis identified by CMR in 28 patients(15%). A comparison with previous studies was also made. Clinical and echocardiographic follow-ups were performed at 12 ± 2 mo and no major adverse cardiac events were revealed.CONCLUSION There is a group of patients with clinical suspicion of ACS displaying normal coronary angiograms. CMR was demonstrated to be a valuable tool in the differential diagnosis evaluation of myocarditis, apical ballooning and MI.

3.0T MR Coronary Angiography after Arterial Switch Operation for Transposition of The Great Arteries-Gd-FLASH Versus Non-Enhanced SSFP.A Feasibility Study

Background:Patency of the coronary arteries is an issue after reports of sudden cardiac death in patients with transposition of the great arteries(TGA)operated with arterial switch(ASO).Recent studies give rise to concern regarding the use of ionising radiation in congenital heart disease,and assessment of the coronary arteries with coronary MR angiography(CMRA)might be an attractive non-invasive,non-ionising imaging alternative in these patients.Theoretically,the use of 3.0T CMRA should improve the visualisation of the coronary arteries.The objective of this study was to assess feasibility of 3.0T CMRA at the coronary artery origins by comparing image quality with non-contrast CMRA in ASO TGA patients to healthy age-matched controls,and by comparing image quality with non-contrast CMRA to contrast enhanced CMRA in the patient group.Material and methods:Twelve patients,9-15 years(mean 11.9 years,standard deviation 1.5 years),and 12 age-matched controls(mean 12.7 years,standard deviation 1.7 years)were examined with 3D balanced steady-state free precession(SSFP).Nine of twelve patients had Gadolinium-enhanced fast low-angle shot(Gd-FLASH)performed after SSFP.Image quality at the coronary artery origins was evaluated subjectively with a 10 cm figurative visual analogue scale(fVAS)and objectively by signal-to-noise and contrast-to-noise ratio(SNR,CNR).Results:All,but one,coronary artery origins were identified.No significant difference in image quality scores was found between patients and controls with SSFP(mean values 6.5 cm—9.1 cm in patients and 7.0 cm—8.0 cm in controls,p-values>0.1).With SSFP,intra-observer fVAS mean score was 6.7 cm—8.6 cm and with Gd-FLASH 7.7 cm—8.7 cm.CNR was higher with Gd-FLASH(p<0.03).Intra-observer agreement index(AI)with SSFP was moderate-to-good(0.43–0.71)and with Gd-FLASH good(0.64–0.79)in all origins.Inter-observer AI was good in the left main stem(LMS)with SSFP(0.65).With Gd-FLASH inter-observer AI was good in LMS(0.78)and moderate(0.5)in the left anterior descending artery,but lacking in the other origins though with a good agreement on Bland-Altman plots.Conclusions:Our findings indicate a better,more reproducible image quality with Gd-FLASH than with non-contrast SSFP CMRA on 3.0T for evaluation of the coronary artery origins in ASO TGA children and adolescents.

非对比增强冠状动脉磁共振血管成像的研究进展

非对比增强冠状动脉磁共振血管成像(non-contrast-enhanced coronary magnetic resonance angiography,NCE-CMRA)作为无创影像检查方法之一,具有无电离辐射、无须对比剂的优势,在心血管疾病的筛查、诊断及随访中具有重要价值。近年来诸多NCE-CMRA新技术集中涌现,使其在扫描时间及成像质量方面均取得了进步,并在心血管疾病的研究中取得了新的进展。本文主要对NCE-CMRA近年来的研究进展进行综述。

3.0T无对比剂MR冠状动脉造影图像质量的影响因素

目的分析影响3.0T无对比剂MR冠状动脉造影(MRCA)图像质量的因素。方法前瞻性对170例疑诊冠状动脉疾病患者行3.0T全心无对比剂MRCA检查,针对冠状动脉主要分支包括左前降支(LAD)、左回旋支(LCX)及右冠状动脉(RCA)进行主观评分,计算其信噪比(SNR);根据3支总得分将图像分为优、良、中或差;采用单因素分析及有序logistic回归分析筛选MRCA图像质量的影响因素。观察回归分析结果显示差异有统计学意义的参数与MRCA图像质量的相关性,并以受试者工作特征(ROC)曲线分析其评估图像质量的效能。结果MRCA主观评分结果为优、良、中(以上可用于诊断)及差者(不可用于诊断)分别为36、46、57及31例;其间LAD、LCX及RCA的SNR总体差异具有统计学意义(P均<0.01)。患者体质量指数(BMI)(OR=0.64)、心率(OR=0.96),以及采集效率(OR=1.06)和体位(OR=0.33)均为MRCA图像质量的影响因素(P均<0.05),且均与图像质量评分相关(r=-0.604、-0.250、0.500、0.407,P均<0.001);分别以≤25.5 kg/m^(2)、≤70次/分、≥37%及手下摆为阈值,BMI、心率、采集效率及手上举或下摆判断MRCA图像可否用于诊断的曲线下面积(AUC)为0.802、0.704、0.955及0.686。结论患者BMI、心率,以及采集效率和体位为3.0T无对比剂MRCA图像质量的影响因素。

心脏腺苷负荷磁共振成像与双源CT冠状动脉造影在冠心病早期诊断中的临床应用分析

目的分析心脏腺苷负荷磁共振成像与双源CT冠状动脉造影在冠心病早期诊断中的临床应用效果。方法回顾性方式进行此次研究,将我院2019年5月-2020年7月接收的35例冠心病患者纳入研究,采用双源CT冠状动脉造影、心脏腺苷负荷磁共振成像检查,观察诊断结果。结果选择性冠状动脉造影有122个狭窄段,CTCA:70个狭窄段和333个非狭窄血管。CTCA:15个狭窄节段(假阳性)。与CT冠状动脉造影相比,选择性冠状动脉造影的特异性96%,敏感性68%,阴性预测值92.5%,阳性预测值85.8%。结论心脏腺苷负荷磁共振成像技术,可提高患者诊断率,尤其在心肌缺血诊断阳性率方面具有显著价值。

肝移植受者术前心脏疾病风险评估的现状及展望

随着肝移植疾病谱和器官分配体系等因素的改变,越来越多伴有心血管合并症的患者进入移植等待名单。手术应激、严重感染、免疫抑制药物不良反应等亦会导致术后心脏并发症发生风险显著增加,影响受者短期及长期生存。因此,术前对受者心脏结构及功能进行全面评估,对改善肝移植预后尤其重要。本文就肝移植围手术期心脏疾病风险增加的主要原因、肝移植受者心脏疾病风险评估的时机和方法进行综述,介绍当前肝移植术前常见心脏疾病的评估手段,以期为进一步降低肝移植术后心脏并发症发生率、提高移植物和受者存活率、改善临床预后结果提供参考。

1.5T无对比剂全心冠状动脉磁共振血管成像评估冠状动脉狭窄严重程度的临床价值

目的评价无对比剂1.5T磁共振自由呼吸全心冠状动脉成像(MRCA)对冠心病≥50%及≥70%冠状动脉狭窄的诊断性能。方法前瞻性纳入41例冠心病拟行介入冠状动脉造影(ICA)的患者,行无对比剂1.5T自由呼吸全心MRCA。同时判断是否存在≥50%及≥70%管腔狭窄,以ICA为参考标准评估诊断效能,比较两者的敏感性、特异性及诊断准确性。结果41例患者均完成MRCA,平均扫描时间(10.1±2.2)min。MRCA诊断≥50%及≥70%冠状动脉狭窄的敏感性、特异性、准确性在患者水平分别为100%(95%CI:89%~100%)及82%(95%CI:63%~94%)、38%(95%CI:9%~76%)及54%(95%CI:25%~81%)、88%(95%CI:73%~95%)及73%(95%CI:57%~85%);在血管水平分别为95%(95%CI:87%~99%)及86%(95%CI:73%~95%)、58%(95%CI:45%~71%)及76%(95%CI:65%~85%)、78%(95%CI:69%~84%)及80%(95%CI:71%~86%)。MRCA在血管节段水平诊断≥50%狭窄的敏感性明显高于诊断≥70%狭窄(97%比88%;χ^(2)=5.73,P=0.017),特异性明显低于诊断≥70%狭窄(86%比94%;χ^(2)=14.12,P<0.001)。结论无对比剂1.5T自由呼吸全心MRCA诊断冠状动脉≥50%及≥70%狭窄均具有较高的敏感性及准确性。与诊断≥50%狭窄相比,MRCA诊断≥70%狭窄在血管节段水平的敏感性较低,特异性较高。

MRI检测活性心肌及其与冠状动脉造影、SPECT和PET对比研究

目的分析MRI对冠心病患者心肌活性的诊断价值并与冠状动脉造影、SPECT和PET结果对比。方法应用MRI对21例临床符合冠心病的患者进行检查,并将结果与冠状动脉造影、SPECT和PET检查结果对照。结果MRI静息心肌灌注扫描检出的缺血节段比狭窄冠状动脉的供血节段少但无统计学差异(Z=-1.732,P=0.083);比SPECT心肌灌注扫描检出的缺血节段多且有统计学差异(Z=-3.691,P=0.000)。SPECT心肌灌注扫描检出的缺血节段比狭窄冠状动脉的供血节段少且有统计学差异(Z=-3.029,P=0.002)。以正电子发射断层显像(PET)结果为标准,MR延迟扫描检测活性心肌的灵敏度为97.6%,特异度为98.4%,总符合率为98.2%,Kappa值为0.953。MR延迟扫描检出的活性心肌比PET检出的少但无统计学差异(Z=-0.209,P=0.835)。结论MR心脏检查清晰显示心肌梗死的位置、程度和附壁血栓情况,并可对左室室壁运动进行直观显示。常规SPECT心肌灌注显像由于空间分辨率低明显低估心肌缺血范围。心肌PET显像空间分辨率低,无法显示心肌梗死的透壁程度,且不能直观显示室壁运动情况。

对比增强磁共振冠状动脉成像的初步研究

目的 利用三维对比增强磁共振血管成像技术 ,对正常冠状动脉成像进行初步研究。方法 30例健康志愿者进行对比增强磁共振冠状动脉成像 ,采用 3DFLASH压脂序列 ,心电触发、屏气状态下分别行左、右冠状动脉成像 ;经后处理得到左主干、左前降支、左回旋支和右冠脉的图像 ,对图像质量进行评分 ,并且测量血管分支显示长度。结果 对其中 2 6例健康志愿者的 10 4支冠状动脉分支进行了分析 ,85支血管较满意显示 (评分在 3分以上 ) ,其中左前降支 2 6例和右冠脉 2 6例均满意显示 ,左主干和左回旋支显示满意者分别为 2 1例和 12例。血管显示长度 :左主干(1.5 4± 0 .31)cm、左前降支 (6 .6 4± 0 .5 4 )cm、左回旋支 (2 .4 6± 0 .98)cm、右冠脉 (9.75± 1.14 )cm。显示血管分支长度与国内外同类研究相比近似。结论 对比增强磁共振技术可用于冠状动脉成像 ,但存在一些技术障碍。

64层CT冠状动脉成像、磁共振多技术扫描评价冠心病的对比研究

目的比较64层螺旋CT冠状动脉造影(CTA)和磁共振心脏多技术扫描对冠心病(CHD)的诊断结果。方法28例拟行冠状动脉造影(CAG)的冠心病患者,于术前一周完成64层螺旋CTA及磁共振心脏多技术扫描,分别与CAG进行对照。结果64层螺旋CTA与CAG对各支冠状动脉狭窄程度的显示具有较好的一致性(P<0.05)。64层螺旋CTA判断中、重度狭窄血管(≥50%)的敏感度、特异度、准确度、阳性预测值、阴性预测值为87.88%、98.73%、95.54%、96.67%、95.12%。磁共振多技术扫描左室增大8例,室壁明显变薄7例。在476个节段中,29个节段(6.09%)运动减弱或不运动,9个节段(1.89%)出现矛盾运动或室壁瘤。冠状动脉轻、中、重度狭窄组的心肌磁共振灌注及延迟扫描序列阳性显示率为26.32%、89.47%、100%。MRI间接判断中、重度狭窄血管(≥50%)的敏感度、特异度、准确度、阳性预测值、阴性预测值为93.75%、86.54%、89.29%、81.08%、95.74%。结论64层螺旋CTA和MR心肌灌注显示冠心病中、重度狭窄血管与CAG的结果差异无明显统计学意义;两种方法的准确度无明显差异,对冠心病的诊断各具优势。

3.0T高分辨率自由呼吸导航全心冠状动脉成像初步研究

目的前瞻性评价3.0 T高分辨率自由呼吸导航全心冠状动脉成像的临床应用价值。资料与方法68例临床疑为冠心病的患者接受了3.0 T MRA全心冠状动脉检查,采用向量心电门控(VCG)和自由呼吸导航技术,自由呼吸状态下成像。后处理使用3D容积再现(VR)技术和“肥皂泡(Soap-Bubble)”曲面重组技术进行全心冠状动脉重建,分析冠状动脉的走行、狭窄的原因及程度,并与其中26例同期开展了冠状动脉血管造影的患者进行了对比,分析3.0 T全心冠状动脉MRA评估冠状动脉狭窄的临床意义。结果68例受检者中,64例获得了满意的检查结果(94%)。发现先天性冠状动脉变异1例,冠状动脉壁斑块形成49例,敏感性为87%,特异性为73%,阳性预测值为81%,阴性预测值为80%。所有病例的检查时间少于30 min。3D VR全心冠状动脉重建能完整地再现冠状动脉树,观察冠状动脉的走行,发现冠状动脉先天性变异、主干局部变细以及中断等;“Soap-Bubble”则能够分别测量冠状动脉每一支狭窄的程度,分析狭窄的原因。结论自由呼吸全心冠状动脉MRA能够成功抑制心肌运动,增强冠状动脉血管与周围组织的对比度,无创性地进行三维冠状动脉成像,初步评价冠状动脉主干近、中段狭窄程度和原因。

MR心肌灌注成像、CT冠脉成像与选择性冠脉造影的对比研究

目的探讨MR心肌灌注成像、CTCA诊断冠心病的临床价值。方法对30例SCA确诊的冠心病患者行ATP负荷MR首过心肌灌注、延迟增强成像、CTCA检查,并与DSA进行对比研究,计算敏感度、特异度和一致性检验kappa值。结果冠脉狭窄50%～70%23支,首过灌注减低18支(78.26%),延迟扫描心肌无强化。冠脉狭窄70%～90%17支,首过灌注减低15支(88.24%),延迟扫描心肌强化有8个区域。冠脉狭窄>90%5支,首过灌注减低5支(100%),延迟扫描均见心肌强化。13个心肌延迟强化区内,心肌透壁增强6例(46.15%),非透壁增强7例(53.85%)。以冠脉造影为参考标准,MR首过心肌灌注成像、CTCA检测狭窄50%以上冠状动脉病变的敏感度和特异度分别为84.44%、91.11%和90.48%、97.09%。MRMPI、CTCA与SCA一致性检验kappa值分别为0.76和0.88。结论MRMPI、CTCA与SCA检查结果具有高度一致性,具有高度的敏感度、特异度,MRMPI能有效检测心肌血流,CTCA能准确判断冠脉狭窄度,可为临床诊断及恰当治疗提供可靠的依据。

磁共振在单心室心功能检测中的应用

目的利用磁共振成像(MRI)对53例单心室进行心功能检测研究,测得数值与心血管造影(CAG)结果作对照。方法53例单心室,男31例,女22例,平均年龄(4.49±3.95)岁;术前43例,术后10例;分别通过核磁共振的电影序列扫描和CAG计算单心室舒张末、收缩末容量,心每搏量和射血分数,利用均数及t检验进行数据统计分析。结果53例单心室MR心功能测量值:舒张末容量均值(101.61±33.61)ml/m^2,收缩末容量均值(40.31±16.56)ml/m^2,每搏量均值为(62.59±22.66)ml/m^2,射血分数为(61.23±8.45)%;CAG测得单心室舒张末容量均值(137.59±53.59)ml/m^2,收缩末容量均值(61.81±22.13)ml/m^2,每搏量均值为(76.05±35.46)ml/m^2,射血分数均值为(53.61±9.68)%,经统计学分析,两组参数间差异无统计学意义。结论利用MR对单心室的心功能检测是目前非创伤性检查及术后随访中最为可靠的方法。

屏气三维快速平衡稳态进动序列在磁共振冠状动脉成像中的可靠性研究

目的 :评价屏气三维快速平衡稳态进动 ( 3D FIESTA)序列在冠状动脉磁共振成像 (CMRA)中的可靠性。材料和方法 :67例受检者 ,采用心电触发的三维FIESTA序列 ,呼气末屏气采样 ,在 8个不同层面方向定位显示冠状动脉各主支 ,包括右冠 (RCA)、左主支 (LM)、左前降支 (LAD)和左回旋支 (LCX) ,以 0 -IV级图像质量体系为参照 ,评分II级以上作为可接受标准 ,采用美国心脏协会 (AHA)的冠状动脉分段标准评价其显示的长度和范围。结果 :67例受检者能够屏气配合完成检查的 65例 ,检查适用率为 97.0 % ;对AHA 18、19段 (RCA近段和中段 )、AHA 1、2 (LM)、AHA 3、5、7段 (LAD近段和中段 ) ,AHA 10段 (LCX近段 )的显示可重复性为 10 0 % ;对AHA 9、14、2 1段 (LAD、LCX和RCA的远段 )的显示可重复性分别为 95 .3 8%、72 .3 1%、96.92 %。结论 :此三维FIESTA序列可以稳定显示冠状动脉主要分支的近段和中段 ,初步具备临床应用的价值。

3.0T磁共振全心冠状动脉成像在诊断冠状动脉狭窄中的临床价值

目的探讨3.0T磁共振全心冠状动脉成像在冠状动脉狭窄诊断中的临床应用价值。方法应用3.0TMR自由呼吸三维导航快速梯度回波序列,对30例临床怀疑为冠心病患者进行MR全心冠状动脉成像检查,完成MR检查的27例中有19例进行了行冠状动脉造影检查,以血管造影为"金标准",初步估价3.0T磁共振全心冠脉成像诊断冠状动脉狭窄(>50%)的敏感性、特异性、准确度、阳性预测值及阴性预测值。结果30例进行MR全心冠状动脉成像的患者中,27例获得了满意的检查结果(84.5%),MR全心冠状动脉成像检查在进行了冠状动脉造影检查的患者中共发现24支冠状动脉显著狭窄。与冠状动脉造影结果对照,MR全心冠状动脉成像诊断冠状动脉显著性狭窄敏感性为73.91%,特异性为82.29%,准确度为77.19%,阳性预测值为70.83%,阴性预测值为87.88%。结论3.0T磁共振全心冠脉成像能够无创性地进行冠状动脉成像,初步评价冠状动脉主干及近、中段狭窄。冠状动脉MRA表现了较高的阴性预测值,对排除冠状动脉狭窄具有较高的临床应用价值。

全心冠状动脉MR成像的图像质量及其影响因素

目的评价全心冠状动脉MR成像(WH CMRA)的图像质量及其影响因素。方法对88例疑诊冠心病者,采用1.5T非对比增强、心电门控兼呼吸导航、T2预备脉冲并脂肪抑制的3D稳态自由进动序列扫描;采用4分制(1分,差;4分,优)评价图像质量,对得分2～4分者评估冠状动脉的狭窄程度,以CAG显示狭窄≥50%为标准评价MR的准确率。结果①完成组:79例(79/88,89.77%)完成WH CMRA检查,扫描时间(13.28±4.33)min,心率(67±8)次/分,呼吸导航效率(34.12±8.10)%,体质量指数(BMI)为(25.90±3.20)kg/m2;75例平均图像质量评分(2.9±1.0)分,4例图像质量为1分;②对照组:42例(42/75,56.00%)完成CAG检查,扫描时间(13.50±4.60)min,心率(67±10)次/分,图像质量评分(3.2±0.9)分,与CAG间隔(5±2)天;WH CMRA诊断冠状动脉狭窄的敏感度、特异度、阳性预测值、阴性预测值和准确率分别为90.48%(19/21)、66.67%(14/21)、73.08%(19/26)、87.50%(14/16)和78.57%(33/42);③完成组与对照组间平均年龄、心率、扫描时间、呼吸导航效率、BMI和图像质量间差异均无统计学意义(P均>0.05)。结论WHCMRA图像质量大多能满足诊断需要,主要影响因素包括心脏搏动、呼吸运动和BMI。