Early prediction of myocardial viability after acute myocardial infarction by two-dimensional speckle tracking imaging

Background Identifying the transmural extent of myocardial necrosis and the degree of myocardial viability in acute myocardial infarction （AMI） is important clinically. The aim of this study was to assess myocardial viability using two-dimensional speckle tracking imaging （2D-STI） in patients with AMI. Methods 2D-STI was performed at initial presentation, three days, and six months after primary percutaneous coronary intervention （PCI） in 30 patients with AMI, who had a left anterior descending coronary artery （LAD） culprit lesion. In addition, 20 patients who had minimal stenotic lesions （〈 30% stenosis） on coronary angiography were also included in the control group. At six months dobutamine echocardiography was performed for viability assessment in seven segments of the LAD territory. According to the recovery of wall motion abnormality, segments were classified as viable or non-viable. Results A total of 131 segments were viable, and 44 were nonviable. Multivariate analysis revealed significant differences between the viable and nonviable segments in the peak systolic strain, the peak systolic strain rate at initial presentation, and peak systolic strain rate three days after primary PCI. Among these, the initial peak systolic strain rate had the highest predictive value for myocardial viability （hazard ratio： 31.22, P 〈 0.01）. Conclusions 2D-STI is feasible for assessing myocardial viability, and the peak systolic strain rate might be the most reliable predictor of myocardial viability in patients with AMI.

Value of myocardial function in children with Kawasaki disease by two-dimensional and three-dimensional ultrasound speckle tracking

Objective:To investigate the value of two-dimensional ultrasound speckle tracking(2D-STI)and three-dimensional ultrasound speckle tracking(3D-STI)in evaluating myocardial function in children with Kawasaki disease.Methods 92 children with Kawasaki disease admitted to our hospital from February 2017 to February 2019 were retrospectively analyzed.50 children who underwent 3D-STI examination were taken as observation group and 42 children who underwent 2D-STI examination were taken as control group.The left ventricular systolic function index,storage time and analysis time of the image,the diameter of coronary artery,the strain difference of left ventricular basal segment,middle segment,apical segment and whole segment were observed.Results The levels of left ventricular end-diastolic volume(LVEDV),left ventricular end-systolic volume(LVESV),left ventricular myocardial mass(LVMI)in the observation group were higher than those in the control group(P<0.05),but there was no statistical difference in left ventricular ejection fraction(LVEF)between the two groups(P>0.05).The storage time and analysis time of the image in the observation group were significantly lower than those in the control group(P<0.05).The left coronary artery(LCA)and right coronary artery(RCA)in the observation group were higher than those in the control group(P<0.05).There was no statistical difference between left anterior descending(LAD)in the two groups(P>0.05).The longitudinal peak systolic strain(LS),circumferential peak systolic strain(CS)and radial peak systolic strain(RS)in the observation group were higher than those in the control group(P<0.05).The global longitudinal peak strain(GLS),global circumferential peak strain(GCS)and global radial peak strain(GRS)in the observation group were higher than those in the control group(P<0.05).LS and CS in the middle segment of the observation group were higher than those in the control group(P<0.05).Conclusions Compared with 2D-STI,3D-STI can objectively and accurately reflect the myocardial function of children with Kawasaki disease.

Evaluation of the Effect of Sigmoid-Shaped Interventricular Septum on Left Ventricular Systolic Function in Patients with Essential Hypertension by Two-Dimensional Speckle Tracking Echocardiography

Objective: To evaluate left ventricular regional and global systolic function by measuring left ventricular longitudinal strain (LS) in hypertensive patients with sigmoid-shaped interventricular septum (SIS) by two-dimensional speckle tracking (2D-STE);in order to explore whether the sigmoid-shaped interventricular septum affects the left ventricular systolic function in patients with hypertension. Methods: Routine echocardiographic parameters were measured in 30 hypertensive patients with SIS (SIS group) and 30 hypertensive patients without SIS (non-SIS group). The left ventricular segments and global LS were measured by 2D-STE, and the two sets of parameters were compared. Results: The value of the thickness of the basal segment of the interventricular septum (IVSBT), the thickness of the middle segment of the interventricular septum (IVSMT) and the ratio of the basal segment of the ventricular septum to the middle segment of the interventricular septum (IVSBT/IVSMT) in SIS group was higher than that in non-SIS group. However, the value of left ventricular outflow tract diameter (LVOTD) in SIS group was lower than that in non-SIS group. There was a significant difference between the two groups (all P Conclusion: SIS affects left ventricular regional systolic function of patients with hypertension. 2D-STE can early evaluate left ventricular longitudinal systolic function in hypertensive patients with SIS.

Value of two-dimensional speckle tracking imaging in quantitative assessment of left ventricular function in patients with OSAS

Objective: To research the clinical application of two-dimensional speckle tracking imaging (2D-STI) in quantitative assessment of left ventricular function in patients with obstructive sleep apnea-hypopnea syndrome (OSAS). Method: From July 2016 to December 2018, 86 patients with OSAS were selected as OSAS group. According to sleep apnea hypopnea index (AHI), they were divided into mild OSAS group (24 cases), moderate OSAS group (29 cases) and severe OSAS group (33 cases). Another 50 healthy volunteers who underwent physical examination in our hospital during the same period were selected as the control group. The left ventricular function of all patients was quantitatively assessed by 2D-STI. The left ventricular function of all patients was quantitatively assessed by 2D-STI. The results of routine echocardiography and left ventricular global strain parameters of the OSAS group, the control group and the OSAS patients with different severity were compared and analyzed. Result: There were no significant differences in the levels of left ventricular ejection fraction (LVEF), left ventricular end diastolic diameter (LVEDd), left ventricular end systolic diameter (LVESd) between the two groups and OSAS patients with different severity (P>0.05). The levels of IVST, LVPW and LVMI in the OSAS group were significantly higher than those in the control group, the levels of end-diastolic interventricular septal thickness (IVS), left ventricular posterior wall thickness (LVPW), left ventricular mass index (LVMI) in the severe OSAS group were significantly higher than those in the mild and moderate OSAS group, and the levels of IVST, LVPW and LVMI in the moderate OSAS group were significantly higher than those in the mild OSAS group, there were significant differences between groups (P<0.05). The levels of GLS, GRS and GCS in the OSAS group were significantly lower than those in the control group (P<0.05). GLS, GRS and GCS levels in the severe OSAS group were significantly lower than those in the mild OSAS group and the moderate OSAS group, while the levels of global longitudinal strain (GLS), global radial strain (GRS) and global circumferential strain (GCS) in the moderate OSAS group were significantly lower than those in the mild OSAS group (P<0.05). Conclusion: The left ventricular systolic function of OSAS patients is obviously impaired. Left ventricular function in OSAS patients can be assessed timely and accurately by two-dimensional speckle tracking imaging.

Spotted Hyena-Bat Optimized Extreme Learning Machine for Solar Power Extraction

Artificial intelligence,machine learning and deep learning algorithms have been widely used for Maximum Power Point Tracking(MPPT)in solar systems.In the traditional MPPT strategies,following of worldwide Global Maximum Power Point(GMPP)under incomplete concealing conditions stay overwhelming assignment and tracks different nearby greatest power focuses under halfway concealing conditions.The advent of artificial intelligence in MPPT has guaranteed of accurate following of GMPP while expanding the significant performance and efficiency of MPPT under Partial Shading Conditions(PSC).Still the selection of an efficient learning based MPPT is complex because each model has its advantages and drawbacks.Recently,Meta-heuristic algorithm based Learning techniques have provided better tracking efficiency but still exhibit dull performances under PSC.This work represents an excellent optimization based on Spotted Hyena Enabled Reliable BAT(SHERB)learning models,SHERB-MPPT integrated with powerful extreme learning machines to identify the GMPP with fast convergence,low steady-state oscillations,and good tracking efficiency.Extensive testing using MATLAB-SIMULINK,with 50000 data combinations gathered under partial shade and normal settings.As a result of simulations,the proposed approach offers 99.7%tracking efficiency with a slower convergence speed.To demonstrate the predominance of the proposed system,we have compared the performance of the system with other hybrid MPPT learning models.Results proved that the proposed cross breed MPPT model had beaten different techniques in recognizing GMPP viably under fractional concealing conditions.

3D-STI参数评价抗HER-2药物对乳腺癌患者心室功能变化的价值

目的 探讨三维斑点追踪成像(Three Dimensional Speckle Tracking Imaging,3D-STI)参数评价抗人表皮生长因子受体-2(Human Epidermal Growth Factor Receptor-2,HER-2)药物对乳腺癌患者心室功能变化的价值。方法 选取我院2021年6月至2022年6月收治的50例需行辅助化疗乳腺癌患者作为观察组,选择同期30名健康志愿者作为对照组。比较对照组与观察组化疗前,化疗第2、4、6周期常规超声心动图指标与3D-STI参数,以临床病理诊断为“金标准”,并绘制3D-STI参数受试者工作特征(Receiver Operating Characteristic,ROC)曲线。结果 观察组化疗第6周期E/A值低于对照组和化疗前(P<0.05),观察组化疗第2、4、6周期左心室扭转、心肌综合指数值低于对照组和化疗前(P<0.05),观察组化疗第4、6周期整体纵向应变(GlobalLongitudinalStrain,GLS)低于对照组和化疗前(P<0.05);ROC曲线显示GLS敏感度最高,为96.00%,整体圆周应变特异性最高,为96.67%。结论 3D-STI参数可评估乳腺癌患者抗HER-2药物化疗后心室功能变化,为临床早期干预提供诊断依据。

二维斑点追踪成像评估2型糖尿病患者右心功能的价值

目的:探讨二维斑点追踪超声心动图(2D-STE)评估2型糖尿病患者右心功能的临床价值。方法:搜集我院收治的糖尿病患者127例,并根据代谢风险因素进行分层,其中低风险组(DM1)60例,高风险组(DM2)67例;同时选取同期年龄、性别与之相匹配的健康志愿者41例为对照组。搜集所有受试者血压、甘油三酯、BMI等临床资料;进行常规超声心动图和2D-STE检查,离线分析右心室游离壁应变,并进一步对右心室游离壁进行分段分析。比较糖尿病组与正常对照组、DM1组与DM2组各参数的差异,并应用受试者工作特征(ROC)曲线分析相关参数评估右心功能的价值。结果:糖尿病组的右心室游离壁厚度、三尖瓣环收缩期速度、右心室心肌工作指数较正常对照组显著增高,三尖瓣E/A值、右心室游离壁应变RVFWS绝对值、右心室游离壁基底段、中间段及心尖段应变绝对值较对照组明显下降,差异有统计学差异(P<0.05)。DM2组的右心室游离壁厚度及右心室心肌工作指数较DM1组增高,右心室游离壁应变绝对值、右心室游离壁中间段及心尖段应变绝对值较DM1组显著下降,差异有统计学意义(P<0.05)。ROC曲线分析结果显示,心尖段应变区分DM1组与DM2组的效能较高,约登指数为0.389,AUC为0.743(95%CI:0.657~0.829),敏感度为0.806,特异度为0.583。结论:二维斑点追踪成像有助于及时发现糖尿病患者右心室功能变化,且合并高代谢风险因素糖尿病患者的右心室功能变化更明显。

金鲳鱼白点病对其运动轨迹图像重叠的影响

【目的】探明不同密度条件下金鲳鱼白点病发生对其运动轨迹图像重叠的影响,为金鲳鱼的资源保护和深海智慧网箱养殖提供参考。【方法】以健康金鲳鱼和患白点病金鲳鱼为研究对象,采用对比分析法,研究健康和患白点病金鲳鱼的运动轨迹及轨迹图像重叠度变化。【结果】健康金鲳鱼多处于环游状态,运动轨迹为曲线,且随密度增加环游现象明显;患白点病金鲳鱼的环游状态较健康金鲳鱼低,且较长时间段喜停驻在观测水箱角落。健康金鲳鱼的运动轨迹图像重叠度在不同时间较为均匀,随密度增加而增加;患白点病金鲳鱼的运动轨迹图像重叠度不稳定,同组间易出现较大差异。健康金鲳鱼大多时间在中心和边缘区域来回游动,运动频率相对较高,在中心区域停留的时间短,往返频率随密度的增加而增加;患白点病金鲳鱼在中心区域停留的时间较短,进出中心区域的频率低。随试验时间推移,金鲳鱼在中心区域停留的时间延长,进出中心区域的次数减少。【结论】金鲳鱼患白点病后活力减弱,对其运动轨迹、轨迹图像重叠度及在中心区域停留时间均有影响。

DGPS和SPOT-5异轨立体像对在岷江源构造地貌研究中的应用

以川西岷江源一带为研究区,利用DGPS方法获取野外校正点和验证点,应用SPOT-5异轨立体像对数据生成分辨率为2.5 m的DEM数据和相应的正射影像。获取野外测量校正点22个,验证点15个,实测剖面1条。使用检查点法和剖面检查法进行数据质量评价,进一步获取岷江断裂带沿线的岷江河谷横剖面形态及河流阶地等详细的构造地貌信息。研究表明,利用DGPS在获取少量野外校正点的基础上,可生成用于活动构造及构造地貌详细研究的高质量DEM和正射影像。

实时三维超声心动图与二维斑点追踪技术对PD-1免疫抑制剂诱发早期心肌损伤的评估

目的 应用实时三维超声心动图(RT-3DE)与二维斑点追踪技术(2D-STI)评估PD-1/PD-L1免疫检查点抑制剂(ICIs)治疗期间患者左室收缩功能变化,探讨其在评估ICIs诱发早期心肌损伤中的应用价值。方法 选择2021年3月—2022年9月在本院接受ICIs治疗的32例肿瘤患者作为研究对象。患者在治疗前(T0)、治疗后1个周期(T1)、2个周期(T2)、3个周期(T3)、4个周期(T4)内进行实验室及经胸超声心动图检查。记录患者治疗前后心脏标记物、左心室常规超声心动图参数、RT-3DE参数变化、2D-STI参数变化。结果 在整个随访期间未观察到心脏标记物、血压、心率、心室腔大小的显著变化。从表中可以看到与T0相比,CK、CK-MB、LDH、BNP在T1~T2时有升高趋势,在T3、T4趋于稳定,差异无统计学意义(P>0.05)。所有研究对象的LVEF均>50%。与T0相比,接受PD-1抑制剂治疗后LVGLS降低,并且在T1~T3期上述变化已明显,T4时显著;T0~T4期间LVGCS差异无统计学意义(P>0.05)。T16-SD/R-R(%)、T16-Dif/R-R(%);T12-SD/R-R(%)、T12-Dif/R-R(%);T6-SD/R-R(%)、T6-Dif/R-R(%)在T1~T3期升高,T4期显著升高,差异有统计学意义(P<0.001)。STI联合RT-3DE是预测免疫抑制剂相关早期亚临床心脏毒性的最佳方法,其诊断敏感性为91.67%,特异性为85%。结论 应用二维斑点追踪与实时三维超声心动图对无明显LVEF降低的ICIs诱发早期心肌损伤具有较高的诊断价值。

肾细胞癌患者舒尼替尼治疗前后三维斑点追踪成像参数值变化及对心脏毒性的预警价值

目的探讨肾细胞癌患者舒尼替尼治疗前后三维斑点追踪成像(3D-STI)参数值变化及对心脏毒性的预警价值。方法选取2020年11月至2022年3月本院收治的肾细胞癌患者226例作为观察组,随访18个月记录心脏毒性事件发生情况,选取同期体检健康者226例作为对照组。对比观察组、对照组及观察组中发生心脏毒性事件与未发生心脏毒性事件患者的3D-STI参数值[整体面积应变(GAS)、整体径向应变(GRS)、整体纵向应变(GLS)、整体圆周应变(GCS)、左心室扭转角度(LVtw)、三维左心室射血分数(3D-LVEF)、心肌综合指数(MCI)]。分析肾细胞癌患者舒尼替尼辅助治疗致心脏毒性的影响因素,受试者工作特征曲线(ROC曲线)分析3D-STI参数值对心脏毒性的预警价值,限制性立方样条图分析3D-STI参数值与心脏毒性发生风险间的剂量-效应关系。结果观察组治疗1个周期后GAS、GLS、LVtw、MCI低于治疗前,GAS、GLS、LVtw、MCI低于对照组(P<0.05);观察组226例患者随访18个月,脱落9例,有效随访217例(96.02%),发生心脏毒性事件55例(25.35%),与未发生心脏毒性患者对比,吸烟例数、饮酒例数、高血压例数、局部症状例数、IMDC评分分层、α-羟丁氨酸脱氢酶水平增加,治疗1个周期后GAS、GLS、LVtw、MCI降低(P<0.05);α-羟丁氨酸脱氢酶水平增加是发生心脏毒性的独立危险因素,GAS、MCI升高是发生心脏毒性的独立保护因素(P<0.05);治疗1个周期后,GAS、MCI单独预测肾细胞癌患者舒尼替尼辅助治疗致心脏毒性的AUC值分别为0.814、0.875,联合预测的AUC值为0.910,具有更高预测价值;GAS(χ2=16.708,P<0.001)、MCI(χ2=17.426,P<0.001)与心脏毒性发生风险间存在非线性剂量-反应关系,当GAS<32.73%,MCI<168.74%×°时,GAS(β=-0.709,95%CI=0.283~0.842,P<0.001)、MCI(β=-0.630,95%CI=0.356~0.811,P<0.001)与心脏毒性发生风险呈负相关。结论肾细胞癌患者舒尼替尼治疗过程中3D-STI参数值变化与心脏毒性发生风险关系密切,且存在“阈值效应”,可为临床早期预测心脏毒性发生风险提供参考。

超声心动图斑点追踪技术在蒽环类化疗药物所致心脏毒性反应早期监测中的应用分析

目的研究超声心动图斑点追踪技术在早期监测蒽环类化疗药物所致心脏毒性反应中的应用效果。方法回顾性选取2022年1月至2023年1月沧州市人民医院收治的100例乳腺癌患者,所有患者于蒽环类化疗药物治疗4个周期之后均接受12导联心电图检查,参考检查结果分为A组(心电图异常,n=50)与B组(心电图正常,n=50);同时,选取同一时期入院体检的50名健康女性为C组。三组均接受超声心动图检查,生物力学参数予以二维斑点追踪成像测定。比较三组常规超声心动图相关参数[左心房内径(LAD)、左心室内径(LVD)、室间隔厚度(IVS)、左心室后壁厚度(LVPW)、A峰值流速、二尖瓣口舒张期E、E/A比值,左心室射血分数(LVEF)、左心室舒张末期容积(LVEDV)]与二维斑点追踪成像技术相关参数[基底段平面纵向心肌应变(bLS)、中间段平面纵向心肌应变(mLS)、心尖段平面纵向心肌应变(aLS)、整体全层纵向应变(GLS)、达峰时间离散度(PSD)、整体全层径向应变(GRS)、整体全层圆周应变(GCS)、心尖部旋转角度峰值(AP-Prot)、心底部旋转角度峰值(MV-Prot)、左心室整体扭转角度峰值(LV-Ptw)]。结果三组LAD、LVD、IVS、LVPW、LVEF比较,差异均无统计学意义(P>0.05);A组E/A比值为0.91±0.21,明显低于B组(1.31±0.22)、C组(1.33±0.24),LVEDV为(104.25±12.86)mL,明显高于B组[(88.87±11.46)mL]、C组[(88.59±11.13)mL],差异均有统计学意义(P<0.05)。A组bLS、mLS、aLS、GLS、GRS、GCS、AP-Prot、LV-Ptw分别为-8.59±2.12、-10.36±2.33、-9.28±2.20、-9.52±2.09、15.58±4.61、-13.29±3.32、(4.28±0.99)°、(9.19±1.62)°,均明显低于B组[-16.23±2.38、-15.22±2.49、-16.41±2.22、-15.92±2.57、21.63±6.78、-18.39±3.12、(7.58±2.31)°、(13.71±2.14)°]、C组[-21.79±3.45、-18.37±2.41、-19.98±4.11、-20.01±4.12、25.17±6.59、-19.17±5.96、(9.19±2.43)°、(16.12±2.31)°],PSD为(66.89±15.67)ms,明显高于B组[(46.63±13.09)ms]、C组[(29.82±6.86)ms],B组bLS、mLS、aLS、GLS、GRS、AP-Prot、LV-Ptw均明显低于C组,PSD明显高于C组,差异均有统计学意义(P<0.05)。结论超声心动图斑点追踪技术于早期监测蒽环类化疗药物所致心脏毒性反应中具有显著效果,观察左心室纵向心肌活动可对早期心脏收缩功能异常予以评估。

心脏超声斑点追踪在非ST段抬高型急性心肌梗死患者诊断中的应用及临床价值

目的探讨二维超声斑点追踪成像(spottracking imaging,STI)应用于非ST段抬高型急性心肌梗死(non-ST segment elevation acute myocardial infarction,NSTEAMI)临床诊断工作中的具体价值。方法回顾性选取2021年3月—2023年4月于菏泽市中医医院就诊的120例急性心肌梗死患者的临床资料为研究组,同期体检的120例健康人群的临床资料为对照组。两组均行STI检查。对比研究对象的STI检查结果,包括梗死节段心内膜、梗死节段心外膜、整体收缩期峰值纵向应变(longitudinal peak systolic strain,LPSS)、峰值环向应变(circumferential peaksystolic strain,CPSS)等。结果研究组整体、梗死节段心内膜、梗死节段心外膜LPSS、CPSS均高于对照组,差异有统计学意义(P均<0.05)。研究组NSTEAMI患者梗死节段心内膜、梗死节段心外膜LPSS、CPSS均低于ST段抬高型急性心肌梗死(ST segment elevation acute myocardial infarction,STEAMI)患者,差异有统计学意义(P均<0.05)。NSTEAMI患者整体LPSS、CPSS分别为(-19.38±3.08)%和(-17.40±4.51)%,低于STEAMI患者的(-12.25±1.41)%、(-13.98±2.83)%,差异有统计学意义(t=16.304、4.975,P均<0.05)。结论应用STI对NSTEAMI病情具有一定的辅助诊断价值。

首钢水钢轨道衡远程点检系统运用研究与实践

本文探讨了轨道衡远程点检系统的研发与实际运用,实现了对轨道衡设备的实时监控和远程诊断,有效降低人工点检误差和成本。通过构建智能检测模型,能够及时发现并预警潜在故障,确保生产过程的安全稳定。此外,该系统还具备数据采集、分析功能,为设备维护决策提供了科学依据。实施后,显著提升了设备运行效率,减少了停机时间,对提升企业整体运营效益具有积极意义。

代理购电政策下电网双轨制不平衡费用评估

以含大规模外来电和复杂电源结构的电网为对象,以电网代理购电和现货市场为背景,提出了考虑风光发电波动性的双轨制电力电量平衡分析模型、基于火电负荷率的现货电价简化模拟模型,进而基于不平衡电量和双轨制电价构建了不平衡费用评估模型。通过上述模型,可有效评估双轨制不平衡电量和费用的规模、性质、分布特征,量化电网两类代理购电用户的购电成分,测算“以用定发”机制下优先发电的保障性收购和盈利变化等情况,进而为相关决策提供依据。最后,通过对电网双轨制不平衡费用的评估分析验证了所提方法的有效性。

起重机轨道测量激光光斑中心识别与定位算法

在轨道测量装置中,激光光斑中心检测算法的精度和速度直接影响轨道测量效果,传统的中心算法如灰度质心法、Hough变换等在检测精度或速度上存在不足。文中提出了一种基于高斯积分曲线拟合的光斑中心定位算法,在光斑降噪、特征增强的图像预处理基础上,插值拟合光斑灰度曲面,进行边缘计算、追踪及细化,得到光斑的像素级边缘点,计算其法向等距线及高斯积分拟合点,并通过贝塞尔曲面拟合其对应灰度值,再采用高斯积分曲线拟合得到亚像素级边缘点,对亚像素边缘点进行圆拟合方法最终确定光斑中心点。与灰度质心法、Hough变换椭圆中心法相比,此算法的拟合精度较高,抗干扰性好,达到了实验室环境下轨道测量的精度要求。

二维斑点追踪分层应变技术评价高胆红素血症新生儿早期左心室收缩功能改变的临床价值

目的探讨通过二维斑点追踪显像(2D-STI)技术评价高胆红素血症新生儿(hyperbilirubinemia of newborn,HBN)左心室心肌收缩功能的变化。方法选取134例达到高胆红素血症诊断水平的患儿作为HBN组,56例健康新生儿作为对照组。对不同室壁和节段的内膜下、中层和外膜下心肌进行斑点追踪分析,计算不同部位的心肌整体纵向应变。结果两组新生儿组内比较左心室整体分层纵向应变(LS)存在相同的梯度特征:内膜下至外膜下呈递减趋势,这一梯度特征同样存在于各节段心肌分层LS(P<0.001);基底段至心尖段心肌呈递增趋势(P<0.001)。与对照组比较,HBN组室壁分层应变参数:室间隔三层心肌均减低(P=0.019,0.019,0.023);前壁三层心肌LS均减低,其中内膜下及外膜下心肌LS差异有统计学意义(P<0.05)。节段分层应变参数:心尖段三层心肌均减低,其中仅心尖段外膜下心肌LS差异有统计学意义(P=0.043);整体应变参数:三层心肌整体应变均减低,但差异无统计学意义(P>0.05)。结论2D-STI分层应变技术能够量化评价左心室不同室壁、不同节段和不同层次心肌的纵向应变受损情况,早期发现HBN心肌收缩功能的亚临床改变。

一种舰载雷达海面目标检测处理方法

在复杂海杂波中检测出海面目标并实现稳定跟踪一直是舰载雷达进行海面目标处理时面临的难题。文中在分析雷达常规杂波抑制方法的基础上,分别从雷达调度控制、点航迹处理等方面,给出了圈间变频、基于宽度的幅度加权点迹凝聚、海面目标的机动加速度突变跟踪模型等数据处理方法,针对性地降低海杂波影响,提高海面目标的点迹质量及跟踪性能。通过对某导航雷达实录数据进行处理,文中所提方法能有效地抑制海杂波,显著提高海面目标跟踪的稳定性。

双源CT、2D-STI在评估冠状动脉狭窄情况和左心室功能中的准确性及可行性研究

目的 研究双源CT、二维斑点追踪成像技术(2D-STI)在评估冠状动脉狭窄情况和左心室功能中的准确性及可行性研究。方法 选取106例我院2018年11月至2020年11月疑似冠心病患者,并经相关检查最终确诊104例。采用双源CT、2D-STI对了患者进行检查;并分析冠状动脉狭窄情况和左心室功能中的准确性及可行性。结果 双源CT检出疾病影像特征的百分率为65.38%(68/104),2D-STI检出疾病影像特征的百分率为82.69%(86/104),两项检查组检出疾病影像特征的百分率为97.11%(102/104),说明其对两项联合组的检出率较高(χ^(2)/P=37.782/0.001)。双源CT检出冠状动脉狭窄情况的百分率为78.84%(82/104),2D-STI检查检出冠状动脉狭窄情况的百分率为87.50%(91/104),两项检查组检出冠状动脉狭窄情况的百分率为99.03%(103/104),说明其对两项联合组的检出率较高(χ^(2)/P=20.912/0.001)。与双源CT检查、2D-STI检查、两项检查组检查左心室功能测量值,差异无统计学意义(P>0.05)。与双源CT、2D-STI相比,两项联合对冠状动脉狭窄情况和左心室功能的诊断敏感度、准确度较高,差异具有统计学意义(P<0.05)。ROC曲线显示,两项联合对冠状动脉狭窄情况和左心室功能的鉴别价值较高,差异具有统计学意义(P<0.05)。结论 双源CT联合2D-STI在冠状动脉狭窄情况和左心室功能中的诊断价值较为理想,可用于冠状动脉狭窄情况和左心室功能的临床诊断。

斑点追踪技术在胎儿主动脉缩窄诊断中的应用价值

目的:探寻斑点追踪技术在胎儿主动脉缩窄诊断中的应用价值。方法:回顾性选择产前行最后一次超声心动图检查诊断为可疑主动脉缩窄的胎儿96例,根据胎儿在产后第1周是否需要行主动脉缩窄手术,分为主动脉缩窄组与非主动脉缩窄组(假阳性);同时选择200名健康的胎儿作为对照组。对常规超声心动图参数进行测量后,使用二维图像进行斑点追踪技术分析,并测量和计算出相关参数。以对照组健康胎儿上述各项超声参数的均数和标准差为参考,按照公式计算出96例可疑主动脉缩窄胎儿的Z分数,最后进一步采用logistic回归分析识别出将主动脉缩窄组与假阳性组分开的变量。结果:96例可疑主动脉缩窄胎儿中有46.88%(45/96)产后确诊为主动脉缩窄,另外的53.13%(51/96)产后及跟踪随访1~2年后没有发生主动脉缩窄。主动脉缩窄组产后确诊存在其他心血管异常情况的胎儿占比明显高于假阳性组(P<0.05)。logistic回归分析获得了四腔心切面舒张末期大小、心室舒张末期大小、心室舒张末期形状、心室整体收缩功能、心室应变、心室基底-心尖收缩功能和左心室功能中的28个变量,这些变量能够有效将产后确诊为主动脉缩窄的胎儿与假阳性胎儿区分开(R^(2)=0.76)。该模型预测主动脉缩窄的敏感性为95.56%,特异性为96.08%,受试者工作特征曲线的曲线下面积为0.982(95%CI=0.832~0.998)。结论:对多个超声心动图测量值进行斑点追踪技术分析,有助于产前检查提示为可疑主动脉缩窄的胎儿进一步确诊,值得推荐。