门控心肌显像与心血池显像测量左室射血分数的比较

目的评价ECToolbox软件测量门控心肌显像左室射血分数(LVEF)的临床价值.方法 31例患者接受静息态门控心肌显像,用ECToolbox软件测量LVEF,并与一周内门控心血池显像测量的结果比较.结果全部患者用ECToolbox软件测量值与心血池显像测量值的相关性为r=0.699(P<0.001);二者无统计学差别(P＞0.05).EDV<70 ml组患者ECToolbox软件测量值与心血池显像测量值无相关性;前者高于后者(P<0.05).EDV≥70 ml组ECToolbox软件测量值与心血池显像测量值呈强相关(r=0.834,P<0.001);二者无统计学差别(P＞0.05).ECToolbox软件测量值对左室收缩功能是否正常的判断与门控心血池显像无差别(P＞0.05).结论用门控心肌显像ECToolbox软件测量LVEF与门控心血池显像比较相关性好且结果准确,但EDV<70 ml时会高估测量值.     

门控心肌显像与超声心动图、心血池显像测定LVEF的对比研究

目的：分析静息门控99TCm-MIBI心肌灌注断层显像与超声心动图、平衡法门控心血池显像左室射血分数（LVEF）测定方法之间的相关性和一致性,明确不同方法之间相互替代的可行性。方法：52例受试者行门控心肌灌注显像、超声心动图、平衡法门控心血池显像。结果：门控心肌显像LVEF值与超声心动图、心血池显像测量值呈正相关;不同病种用门控心肌显像测量的LVEF值均与其他两种方法无统计学差异;门控心肌显像正常组与疾病组LVEF值有统计学差异。结论：静息门控心肌显像具有与心血池显像、超声心动图测量LVEF相互替代的可行性。     

ECToolbox软件计算左心室射血分数的适用性

目的 评价ECToolbox软件中R0、R1、R2公式计算门控心肌灌注显像左心室射血分数(LVEF)的适用性.方法 64例患者[冠状动脉粥样硬化性心脏病(CHD)44例;高血压病20例]接受静息态门控心肌灌注显像(~(99m)Tc-MIBI)和平衡法门控心血池显像(~(99m)Tc-RBC),用ECToolbox软件中的R0、R1、R2公式分别计算LVEF,称为R0 LVEF、R1 LVEF、R2 LVEF.将三种公式的计算结果与平衡法门控心血池显像计算结果对比分析.结果 R0、R1、R2公式LVEF值与门控心血池显像LVEF值均有相关性(r=0.905、0.905、0.903,P均<0.05);χ~2检验三种公式LVEF值落入门控心血池显像LVEF值±15%准确率分别为54.30%、71.40%、22.90%,±30%的准确率为81.40%、88.60%、74.30%;Wilcoxon配对检验结果示R1公式计算结果与门控心血池显像计算结果差异无统计学意义,R0、R2公式计算结果与门控心血池显像计算结果差异有统计学意义.结论 门控心肌灌注显像用ECToolbox软件计算CHD和高血压患者的LVEF时,R1公式最为适用.     

门控心血池显像和组织学超声对比评价左心室机械运动同步性的价值

目的 探讨门控心血池显像位相分析法在评价慢性心力衰竭患者左心室机械运动同步性方面的应用价值.方法 选择2009年3-10月我院住院的169例慢性心力衰竭患者,采用核素门控心血池显像位相分析方法获得左心室相角程宽度(PHB),左心室相角程标准差(PSD)作为评价左心室机械运动同步性的指标;并采用组织多普勒显像(TDI)技术测量左心室12个非心尖节段收缩期峰值速度距QRS起始点时间标准差(Ts-SD)作为评价左心室机械运动同步性指标,对这两种方法所得参数进行比较.结果 门控心血池显像法测定左心室PHB[(91.79±40.14)°]和组织多普勒显像方法测量的Ts-sD[(27.74±13.00)ms]间有良好的相关性(r=0.83,P=0.000);门控心血池显像法测定左心室PSD[(20.59±12.30)°]与和组织多普勒显像方法获得的Ts-SD[(27.74±13.00)ms]中度相关(r=0.69,P=0.000).心脏超声法测量的左心室射血分数为(42.93±14.89)%;核素心血池法为(39.76±17.89)%,心脏超声法数值高于核素心血池法,差异有统计学意义(P<0.01).结论 门控心血池显像法对慢性心力衰竭患者左心室机械运动同步性的检测能够提供与TDI相似的信息,其可同时测量双室功能,测量射血分数更加准确,可以联合二种方法筛选心脏再同步治疗患者,提高心脏再同步治疗反应率,使更多的心力衰竭患者从心脏再同步治疗中获益.     

定量门控201Tl心肌灌注显像测量左心室功能的临床研究

目的:探讨定量门控201Tl心肌灌注显像测量左心室功能的临床价值。方法:选择32例不同左心室功能受试者于3日内完成201Tl心肌灌注显像和门控心血池显像测量,比较两者测量的左心室功能参数的相关性;选择128例患冠心病风险概率极低者(小于10%)行201Tl心肌灌注显像检测,建立201Tl心肌灌注显像测量静息左心室射血分数的正常参考值;选择113例不同左心室功能受试者于7日内完成201Tl心肌灌注显像和二维超声心动描记术检测,评价两者测量左心室局部室壁运动的符合程度。结果:201Tl心肌灌注显像和门控心血池显像测量32例不同左心室功能受试者的3项静息左心室功能参数结果分别为:左心室射血分数犤(0.58±0.02)、(0.60±0.02)犦、舒张末期容积犤(67±5)mL、(79±6)mL犦、收缩末期容积犤(30±5)mL、(33±4)mL犦,两者比较的相关系数r分别为0.89、0.87、0.96,均呈显著的正相关(均为P<0.01)。左心室射血分数的正常参考值等于或超过0.43。201Tl心肌灌注显像评价室壁运动与二维超声心动描记术的结果中等符合(Kappa值=0.52,P<0.01)。结论:201Tl心肌灌注显像能准确地评价左心室功能,有较高的临床实用价值。     

心肌梗死患者心肌灌注和心功能参数的定量分析

目的评价AutoQUANT定量门控心肌断层显像测定心肌梗死患者左室射血分数的准确性,为康复措施的介入提供依据。方法研究对象为23例冠心病心肌梗死的男性患者。先行静息门控心肌灌注显像,1周内行平衡法核素心血池显像。将心血池显像测定的左室射血分数作为参考标准,将两种方法测得的射血分数进行相关分析。静息门控心肌显像每心动周期采集16帧图像,矩阵64×64×16,使用Vantage非线性衰减校正。采集结束后先用AutoSPECTplus进行断层重建,再用AutoQUANT进行定量心功能及灌注分析。结果①20例患者中,两种测定方法左室射血分数均大于50%7例,均小于50%者15例,1例为AutoQUANT定量门控心肌断层显像所测射血分数为65%,而平衡法心血池显像所测射血分数为45%,经相关分析,由定量门控心肌断层显像测得的射血分数和由平衡法心血池显像所测得的射血分数高度相关,相关系数为0.94。②在射血分数小于50%的15例中,有8例两种显像都可观察到室壁瘤。其中有2例平衡法心血池显像室壁瘤不如门控心肌断层显像明显。结论①心肌梗死患者的局部心肌放射性分布缺损区对AutoQUANT的定量计算准确性无明显影响。②AutoQUANT定量门控心肌断层显像显示左室舒张末期、收缩末期边界清晰,局部心肌的瘤样膨出和矛盾运动的确定客观可靠。③AutoQUA     

门控心肌显像QGS软件与心血池显像测量 左室射血分数比较

心肌灌注显像及心血池显像是临床常用的核素心脏检查,前者可提供心肌的血流灌注情况,后者可以了解心脏的功能,这两方面信息对于冠心病的诊断、治疗方案的选择及预后评价都具有重要的作用.Germeno等设计了一种三维测量心室容积及射血分数的全自动化软件--定量门电路SPECT软件(QGSPECT),采用该软件即可在一次心肌灌注断层显像采集信息的基础上,同时获得心脏功能参数[1].本研究即应用该软件测定左室射血分数(LVEF),并与平衡法心血池显像测量LVEF进行比较,以评价其临床应用价值.     

门控心肌灌注显像心肌计数影响因素初探

目的探讨门控心肌灌注显像心肌计数的影响因素。方法选取100例静息态及负荷态门控心肌灌注显像正常的患者资料(男性47例,女性53例)。将原始图像重建后,采用感兴趣区(ROI)半定量分析方法,选取短轴显示左室心肌显示较完整的一帧图像,在左室心肌前壁勾画ROI,每个ROI的大小为10 pixels,将ROI的平均计数设定为每次检查的心肌计数。将患者的年龄、身高、体重、心率、显像时间与心肌计数进行相关性分析,将患者性别、负荷方式与心肌计数进行独立样本t检验,体重分组与心肌计数作单因素方差分析,将性别、体重、显像时间和心肌计数作多元线性回归分析。结果所有200例门控心肌灌注显像,性别之间的心肌计数(P=0.007),负荷方式之间的心肌计数(P=0.190)无统计学差异;对于相关性分析,心肌计数与体重呈中度负相关(r=-0.541,P=0.000)、与身高(r=-0.204,P=0.002)及显像时间(r=-0.168,P=0.009)均呈低度负相关,与心率(P=0.176)、年龄(P=0.502)不相关。结论影响门控心肌灌注显像心肌计数的重要因素为性别、体重、显像时间。可通过改进注射药量,规范显像时间,提高显像质量。     

不稳定型心绞痛患者全球急性冠状动脉事件注册评分与心肌灌注显像危险分层的相关研究

目的：研究不稳定型心绞痛患者^99mTc-甲氧基异丁基异腈（MIBI）负荷／静息门控心肌灌注显像危险度分层与全球急性冠状动脉事件注册（GRACE）评分的相关性。方法：2006年6月--2007年11月确诊为不稳定型心绞痛的住院患者37例。首先依据GRACE评分方法进行评分；然后行^99mTc-MIBI运动或腺苷负荷门控心肌灌注显像和静息心肌灌注显像，依据负荷／静息门控心肌灌注显像所测定的可逆性心肌缺血计分值（SDS）和负荷后左室射血分数（LVEF）将患者分为低危组和中危组。分析^99mTc-MIBI负荷／静息门控心肌灌注显像危险分层与GRACE评分的相关性。结果：37例患者均顺利完成^99mTc-MIBI运动或腺苷负荷门控心肌灌注显像和静息心肌灌注显像。低危组和中危组之间的GRACE评分有显著差异（P〈0．01）。GRACE评分与负荷状态下心肌缺血计分值（SSS）呈正相关（r=0．561，P〈0．01），与SDS呈正相关（r=0．623，P〈0．01），与静息状态下心肌缺血计分值（SRS）无关（r=0．175，P〉0．05）。结论：GRACE评分对不稳定型心绞痛患者的核素心肌灌注显像危险度分层有一定的预测价值。     

门控心肌灌注断层显像与冠状动脉造影对急性心肌梗死的诊断价值比较

目的比较冠状动脉造影与门控心肌灌注显像诊断急性心肌梗死的临床价值。方法20例急性心肌梗死患者在2周内分别行门控心肌灌注断层显像、冠状动脉造影及其他影像检查,分别将冠状动脉造影结果、门控心肌灌注图像及室壁增厚率分级（各4级）进行比较。结果门控心肌灌注图像、左室室壁增厚率均与冠状动脉造影分级结果间有较好的相关性,左室室壁增厚率与心肌灌注图像分级结果间有较好的相关性。结论门控心肌灌注显像可提供心肌灌注图像、左室功能及左室运动参数,可作为冠状动脉造影前的可靠筛查手段。     

应用门控心肌显像定量分析室壁局部运动对心功能的影响

目的 利用定量门控^99mTc-MIBI心肌显像评价左心室室壁各节段运动对左心功能的影响。 方法 对768例患者进行门控^99mTc-MIBI心肌显像,采用QGSPECT程序定量获得20节段的局部室壁运动(WM)及左心室射血分数(LVEF)值。分析LVEF与心室各节段WM的关系。 结果 所得4个公共因子分别代表不同的节段信息,F₁反映了心尖、侧壁的近心尖和中段、前壁、下壁和下间隔的近心尖的信息。F₂反映了前壁和下间隔的中段、整个前间隔的信息。F₃反映了前壁和下侧壁的基底段的信息。F₄反映了下壁的中段和基底段及下间隔基底段的信息。利用多元线性回归分析的方法得出其对LVEF影响的大小顺序为F₁＞F₃＞F₂＞F₄(标准回归系数分别为0.633、0.471、0.415、0.169,P＜0.001)。 结论 应用定量门控心肌显像获得的WM与LVEF有显著的相关性,影响最大的包括心尖、侧壁的近心尖和中段、前壁、下壁和下间隔的近心尖。     

Comparison of myocardial gated single photon emission computerised tomography, planar radionuclide ventriculography and echocardiography in evaluating left ventricular ejection fraction, wall thickening and wall motion

Left ventricular ejection fraction (LVEF) and wall thickening are fundamental aspects of cardiac function. Recently, gated single photon emission computerised tomography (GSPECT) and anatomical M-mode echocardiography are new techniques, which have been introduced for the evaluation of left ventricular wall thickening and ejection fraction. These, however, have not been evaluated against established techniques, including equilibrium radionuclide ventriculography (ERNV), which remains the current gold standard for the evaluation of LVEF. We examined the concordance between LVEF, wall motion and wall thickening scores derived from GSPECT, echocardiography and ERNV, in a group of 16 patients with suspected ischaemic heart disease. Estimated ejection fraction correlated better between ERNV and gated SPECT (R2 = 0.93) than between echocardiography and either gated SPECT (R2 = 0.62) or ERNV (R2 = 0.71). There was poor correlation between gated SPECT and anatomical M-mode echocardiography in the assessment of wall thickening (83/150, 56%; kappa= 0.31, p < 0.05) and similar correlation (100/150, 66%; kappa = 0.29, p < 0.01) for wall motion analysis. In conclusion, estimations of ejection fraction by all the three studied modalities agreed to a degree sufficient for routine clinical practice. However, estimates of wall thickening from echocardiography cannot be used interchangeably with those derived from gated myocardial perfusion SPECT.     

SPECT门控心肌灌注显像定量分析的诊断价值

目的:探讨SPECT门控心肌灌注显像定量分析在提高诊断准确性方面的应用价值。方法:回顾分析112例具有完整的~(99m)Tc-MIBI门控静息/负荷心肌灌注显像资料和冠状动脉造影结果的患者资料。由3名有经验的核医学医师首先对SPECT心肌灌注显像的断层图像进行了分析并做出诊断,然后应用定量分析软件对门控图像进行定量分析获得左心室射血分数(LVEF)等功能指标并动态显示室壁运动情况,结合断层图像再次进行图像分析。以冠状动脉动脉造影的结果为标准,对比分析是否应用定量分析软件时诊断的敏感性、特异性和准确性。分析除LVEF外的其他功能性指标对诊断是否具有帮助。结果:112例患者冠状造影结果显示共计有147支冠状动脉管腔狭窄>50%。单纯SPECT心肌灌注显像断层图像目测分析诊断的敏感性、特异性和准确性分别为91.8%、86.8%和90.0%。综合分析断层图像与定量分析指标,诊断的敏感性、特异性和准确性分别为95. 9%、94.2%和94.9%。除LVEF外,其他定量分析指标被认为对诊断具有帮助的占59.8%(67/112),认为不确定者23.2%(26/ 112),认为没有价值者占17.0%(19/112)。结论:借助于定量分析软件可以明显的提高SPECT心肌灌注显像诊断的准确性。     

Good correlation between gated single photon emission computed myocardial tomography and contrast ventriculography in the assessment of global and regional left ventricular function

Purpose: The purpose of this study was to determine the reliability of the measured left ventricular ejection fraction (LVEF) and wall motion analysis by the recently introduced quantitative electrocardiographically (ECG)-gated myocardial perfusion single-photon emission computed myocardial tomography technique (gated SPECT) (QGS). Materials and methods: We compared technetium-99 m tetrofosmin gated SPECT imaging and contrast ventriculography in the assessment of global and regional left ventricular function in 74 patients with undiagnosed chest pain of whom 27 sustained a previous myocardial infarction. Results: Linear regression analysis demonstrated that gated SPECT determined LVEF correlated well with LVEF determined from contrast ventriculography (y = 0.95x + 1.9, r ² = 0.84, p < 0.0001). Bland–Altman plot analysis showed no systematic difference between the two sets of values derived from the two imaging approaches over a wide range of LVEF values. Exact agreement of segmental wall motion scores was 460 of 518 (89%) segments with a kappa value of 0.76 (p < 0.0001). Conclusion: We conclude that gated SPECT imaging is an accurate and reliable clinical tool to accurately measure global and regional left ventricular function.     

Evaluation of left ventricular volumes and ejection fraction by automated gated myocardial SPECT versus cardiovascular magnetic resonance

BACKGROUND: Electrocardiogram-gated myocardial single-photon emission computed tomography (SPECT) with (99m)Tc-tetrofosmin allows simultaneous evaluation of myocardial perfusion and function. In this study, left ventricular volumes, ejection fraction (LVEF), and left ventricular wall volume (LVWV) derived from gated SPECT were compared with measurements from cardiovascular magnetic resonance (CMR), performed within a few hours. METHODS: The study population included 55 patients with known or suspected coronary artery disease, including 13 patients with recent acute myocardial infarction. End-diastolic (EDV) and end-systolic (ESV) volumes, LVEF and LVWV were derived automatically from gated SPECT using commercially available software (QGS). In the CMR studies, manually delineated endocardial and epicardial borders on short-axis slices were used to calculate the volumes. RESULTS: Gated SPECT underestimated EDV by 35 +/- 14 ml (mean +/- SD) (P < 0.001), ESV by 10 +/- 13 ml (P < 0.001), and LVEF by 4 +/- 7 percentage points (P < 0.001). There were no systematic difference in EDV, ESV or LVEF between the methods. SPECT underestimated LVWV by 49 +/- 30 ml (P < 0.001), with a trend towards increasing underestimation by SPECT for larger wall volumes. CONCLUSION: These findings show that gated SPECT slightly underestimates EDV, ESV and LVEF compared with CMR. This underestimation is systematic, however, indicating that ventricular volumes derived from gated SPECT are robust enough to guide clinical management. Estimates of LVWV in patients with large wall volumes are less accurate.     

Analysis of left ventricular function from gated first-pass and multiple gated equilibrium acquisitions

^99mTechnetium-sestamibi is a new myocardial perfusion imaging agent that offers significant physical advantages over²⁰¹thallium for myocardial perfusion imaging. One of these advantages is that it can be used in the assessment of ventricular function by means of first-pass radionuclide angiography (FPRNA), acquired during the injection of the tracer. In this study we compared gated list mode first-pass acquisition with^99mTc-sestamibi (FP-MIBI) to multiple gated equilibrium radionuclide ventriculography (MUGA) with^99mTc-labelled red blood cells for the determination of global left ventricular ejection fraction (LVEF). The study population consisted of 20 patients (mean age 54 years) who were submitted to stress-rest perfusion imaging. Resting FPRNA was performed using^99mTc-sestamibi and the reference data were acquired within a week with the MUGA technique. A linear correlation between FP LVEF and MUG A LVEF gave an r=0.974 (p<0.01). Diastolic and systolic timing and velocity parameters had lower correlations between these two methods. We conclude thatglobal LVEF can be precisely measured with^99mTc-sestamibi when compared to usually employed MUGA technique with^99mTc-labelled red blood cells.     

门控心肌显像在测定左心室射血分数中的应用

目的:应用单光子发射计算机体层摄影(SPECT)技术同时测定不同采集条件下左心室射血分数(LVEF)值,并与超声LVEF值比较,研究其一致性和相关性。方法:选择172例受试者,利用SPECT共行门控显像技术,用99mTc-MIBI作为示踪剂,同时将心动周期设定8和16等份,在一次采集中得到两种条件的LVEF值,并与1周时间所得超声LVEF值作比较,研究门控心肌显像在LVEF测定中的影响因素,以及与常规超声法有无相关性。结果:统计分析显示,心动周期分成8和16等份所得的LVEF值大小是不同的,后者LVEF值较大,但两种方法所得结果存在相关关系。另一方面,SPECT所得的LVEF值均较超声心动图(UCG)所得值大,但与UCG所得结果具有很好一致性。结论:门控心肌显像在心肌活力判断时,利用共行显像技术可同时得到LVEF等心功能参数,其LVEF大小与超声结果有很大相关性,但其值存在显著差异,其正常参考范围尚需进一步研究。     

Normal limits for left ventricular ejection fraction and volumes determined by gated single photon emission computed tomography--a comparison between two quantification methods

To compare gender-related normal limits for left ventricular (LV) ejection fraction (EF), end-diastolic and end-systolic volumes (EDV and ESV), obtained using two myocardial perfusion-gated single photon emission computed tomography (SPECT) quantification methods. A total of 185 patients were retrospectively selected from a consecutive series of patients examined for coronary artery disease (CAD) or for management of known CAD. Patients were included in the study group if they had normal or probably normal results with stress and rest perfusion imaging and if the combined interpretation of perfusion studies and gated rest studies showed no signs or suspicion of myocardial infarction. The gated SPECT studies were performed using a 2-day stress/gated rest Tc-99m sestamibi protocol. All patient studies were processed using CAFU and quantitative-gated SPECT (QGS), the two software packages for quantification of gated SPECT images. The lower normal limits for EF were higher for CAFU compared with QGS for both women (59% versus 53%) and men (54% versus 47%). The upper normal limits for EDV were also higher for CAFU compared with QGS for both women (133 versus 107 ml) and men (182 versus 161 ml). The differences between the software packages were small for ESV (women 44 versus 44 ml; men 69 versus 74 ml). Gender-specific normal limits need to be applied for LV EF and volumes determined by gated SPECT. Separate criteria for abnormal LV EF and EDV need to be used for women and men depending on the software package used.     

The Acute Administration of Trimetazidine Modified Myocardial Perfusion and Left Ventricular Function in 31 Patients with Ischaemic Ventricular Dysfunction

Trimetazidine (TMZ) increases the mithocondrial oxidative metabolism and improves Tc-99m sestamibi uptake in myocardial single photon emission tomography (SPECT). The aim of this study was to evaluate whether the acute administration of TMZ improved myocardial perfusion and modified left ventricular ejection fraction (LVEF) in ischaemic left ventricular impairment. METHODS: Thirty-one patients (23 males, age 66 years) with prior myocardial infarction (>6 months) and echocardiographic LVEF < or = 45% underwent coronary angiography, rest basal myocardial SPECT (after 3-day placebo administration) and rest TMZ myocardial SPECT [after 3-day TMZ administration (60mg/die)]. The left ventricle was analysed in 16 segments. The summed placebo score (SPS) and the summed TMZ score (STS) were calculated with a 5-point scale (from 0 = normal uptake to 4 = absent uptake) by two blinded operators. The GATED Tc-99m SPECT was always provided. RESULTS: After TMZ administration GATED LVEF improved from 26.5+/-9.7% to 29.1+/-11.3% (p = 0.04) and left ventricular end-systolic volume (LVESV) was reduced from 90.2+/-40.7 to 85.6+/-39.2 ml/mq (p = 0.006). Similarly the addition of TMZ to myocardial SPECT significantly reduced the STS compared to SPS (21.5+/-11 vs. 26.6+/-10.5 p = 0.0001). Eleven patients (35.5%) had an echocardiographic LVEF < or = 30%; in these patients who had severe ventricular dysfunction, GATED LVEF and LVESV did not change after TMZ (20.2+/-5.7% vs. 21+/-6.9% p =0.6; 116.7+/-35.3 ml vs. 112.6+/-32.3 ml p = 0.08, respectively). CONCLUSION: In comparison with placebo, the addition of TMZ to myocardial Tc-99m tetrofosmin SPECT improved myocardial perfusion and LVEF, reducing LVESV. These effects were lost in patients with more severe ventricular dysfunction.