心动周期

结论：采用双扇区重建算法，冠状动脉多数在心动周期的R波后75%相位窗上显示最佳，其次为70%和50%相位窗。

Conclusion : The coronary arteries usually were best visualized at 75 % image reconstruction window of the cardiac cycle if two-sector reconstruction algorithm was used .

早搏引起心动周期突然改变时QT间期和RR间距的关系

Relationship between QT and RR Interval in the Cardiac Cycle Abruptly Changed by Premature Beats

心脏成像通常是空间上的2D或3D成像，在心动周期内随时间动态变化构成所谓4D数据。

Typically , cardiac imaging acquires 4D data which include 3D volume data changed with time during the cardiac cycle .

时间因子K定义为心动周期（T）与舒张期持续时间（Td）之比。

K is defined as the ratio of cardiac period ( T ) to total duration of diastole ( Td ) .

随日龄的增加，P，R，T波振幅逐渐增大；P波、QRS波群、T波持续时间占心动周期的百分比随日龄增加而升高；

The percentage of the duration of P wave , QRS complex waves and T waves of the whole cardiac cycle are increased with the increase of day-ages ;

整个心动周期信号、P波、T波的高频谱无明显的规律性，而QRS波有一定的结构。

There was no regularity in the spectrum of entire cycle , P and T waves , but these was some structure in QRS wave .

左冠状动脉通常在心动周期R波后70%相位窗上显示最好，右冠状动脉的最佳相位窗首选为70%相位窗，其次为40%相位窗。

Left coronary arteries were best visualized at 70 % image reconstruction window of the cardiac cycle and right coronary arteries at 70 % and 40 % image reconstruction window .

新生儿心动周期信号（HPS）的混沌特征、功率谱分析

Analysis for chaos characteristics and power spectrum of heart period signal ( hps ) on neonatal

QT间期的测量从QRS波起点至T波终点，同一导联测量3个心动周期，取其平均值。不同导联最大QT值减去最小QT值为QTd值。

QTd is referred to the value between maximum QT and minimum QT in different leads in the same ECG .

方法对健康志愿者15例，采用相位对比电影MRI技术测量大肺动脉血流速度和流量在心动周期内的变化；

Methods The instantaneous velocity and flow volume of main , left and right pulmonary arteries during a cardiac cycle were measured by phase-contrast cine MR imaging in 15 healthy volunteers .

在临床上运用心动周期信号（Heartperiodsignal，HPS）分析作为反映心脏自主神经系统活性（Autonomicnervoussystem，ANS）的一种无创性检测方法已得到广泛公认和应用。

Heart period signal ( HPS ) analysis is used as a non-invasive heart autonomic nervous system ( ANS ) function examination , which has been acknowledged and used extensively in clinic .

提示MS并AF的左室充盈强烈地依赖于心动周期的长度，心率代偿能力非常有限；

It was suggested that left ventricular filling strongly depended on the cardiac cycle , and the compensative ability of heart rate is limited seriously in mitral stenosis .

目的建立正常成人多排螺旋CT（MDCT）心动周期不同时相肺动脉分支几何学数据库。

Objective To establish the database of diameter and length of the pulmonary artery branches in different phase of cardiac cycle in healthy adult chest MDCT .

采用IBS技术于左房后壁及左房腔内测量平均IBS值、超声背向散射积分心动周期变化幅度（cyclicvariationofintegratedbackscatter，CVIB）；

Average IBS and cyclic variation of integrated backscatter ( CVIB ) were measured by IBS on left atrial posterior wall and IBS % were calculated .

结果不同起搏协议描绘的曲线差别很大，当前APD和其前一个心动周期中的DI之间不存在一一对应的函数关系；

Result Different pacing protocols caused different coordinate curves , and there was no one-to-one relation between pre-sent APD and its first previous DI .

心动周期信号（HPS）具有混沌特征，携带有自主神经功能信息。HPS的功率谱分析可以定量地评价交感、副交感神经活动的强弱及其相互作用。

The heart period signal ( HPS ) has chaotic characteristics and it carries information about auto-nomic nervous system funtion .

测量三个心动周期舒张末期的各段动脉的内径和CCA内中膜厚度。

The diameters of all the arteries and the intima - media thickness ( IMT ) of the CCA were measured .

目的研究哮喘儿童心动周期信号（HPS）的混沌特征和功率谱特征，探讨其混沌特征、谱特征在哮喘发作与缓解时的差别，分析其自主神经系统功能的变化。

Objective To study the chaotic characteristics and power spectrum characteristics of heart period signals ( HPS ) in children with asthma .

结果表明，MS并AF心动周期与左室充盈量的相关性明显优于冠心病AF及特发性AF；

Results showed that the mean correlation coefficient R R interval to left ventricular filling volume in patients with mitral stenosis was higher significantly than ischaemic heart disease and idiopathic AF.

方法23例原发性肝癌行间歇二次谐频声学造影，间歇成像由心电图R波触发，触发间隔为1～2个心动周期。

Methods Twenty three cases of HCC were examined with intermittent second harmonic contrast imaging ( ISHCI ), the intermittent imaging were triggered by R wave of electrocardiogram ( ECG ) in the interval of 1 or 2 cardiac cycles .

共诱发5种室速，平均心动周期为（348±65）ms，其中3种室速起源于基质或基质边缘，2种室速的起源远离基质；

Five different clinical VTs [ mean CL ( 348 ± 65 ) ms ] were induced . Of 5 VTs , three were originated from substrate or boundary of substrate , and two had a remote origin .

结果：KMA、Pr、KMA+Pr各组均延长窦性心动周期（SCL）、MAP复极达50%时程并增加心室有效不应期（VERP）；

Results : KMA , Pr and KMA + Pr prolonged SCL , MAPD 50 and increased ventricular effective refractory period ( VERP ) .

该仪器应用四电极法从人体检测出肢体阻抗血流图，应用MCS－51单片机对每一个心动周期实时计算出变动阻抗峰峰值ΔZpp和心动周期时间T。

The instrument detects impedance plethysmography in human limbs and calculates Δ Zpp and T with a MCS-51 single-chip-computer system .

目的：观察左心室（LV）心肌超声组织背向散射积分心动周期变动量（CVIB）与LV舒张功能的关系。

Objective : To study on the relationship between the cyclic variation of integrated backscatter of left ventricular myocardium ( LV CVIB ) and the left ventricular diastolic function .

心肌超声背向散射积分（IB）在心动周期中起伏的幅度因心肌缺血而减小，对诊断心肌缺血有重要临床意义。

The amplitude of the fluctuation of myocardial ultrasonic integrated backscatter ( IB ) decreases when myocardial ischemia occurs , which makes IB important for the diagnosis of this disease .

应用所提算法从较长时间BCG信号中获得呼吸信号和心动周期，从含有人为干扰的BCG信号中确定出无干扰部分的J波位置。

Breathe signal and cardiac cycle is gained from long time BCG signal , and partial J wave positions are determined from the no disturbance part of the artificial disturbance BCG signals according to proposed approaches .

斑点追踪显像（speckletrackingimaging，STI）技术能够追踪二尖瓣环的运动，测量其相对于心尖部的全心动周期的位移和速度，从而评价左心室整体收缩及舒张功能。

Speckle tracking imaging technology can follow the movement of mitral annulus and measure displacement and speed in all the cardiac cycle of mitral annulus relative to apex , thereby can be used to evaluate left ventricular overall systolic and diastolic function .

目的观察超声背向散射积分心动周期变化幅度（CVIB）测值与探头频率及发射声波能量（AP）的关系。

Objective To investigate the influences of transducer frequency and acoustic power ( AP ) on the measurements of the magnitude of cyclic variation of integrated backscatter ( CVIB ) .

ASD面积在心动周期中呈动态改变，缺损面积在收缩末期最大，舒张末期最小，面积变化率15.2%~74.4%，平均变化率47.0%；

Defect area changed significantly during the cardiac cycle , with the maximal area at end-systole and the minimal area at end-diastole , mean change 47.0 % , range 15.2 % to 74.4 % .

讨论：①基于windows开发的系统具有较好的交互性和移植性，②获得胎儿心电后可用我们已开发的成熟技术实现对胎儿心动周期信号的混沌特征分析，以估计胎儿自主神经系统功能。

Discussions : ① The system developed on the base of Windows was much better in interaction and transportability or portability ,② Whenever extracting FECS , the sophisticated technique developed by our laboratory should be used to accomplish analyzing fetal heart period signal and estimating fetal autonomic nervous system function .