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目的探讨室壁与入射超声之间的夹角及应变长度(SL)对长轴方向应变成像(SI)和应变率成像(SRI)的影响。方法SRI定量分析模式下,取样容积置于健康人和冠心病患者心尖四腔观后间隔中部,SL分别设置为2mm、12mm和20mm,测量收缩期和舒张早期峰值应变率(SRs和SRe),比较不同SL条件下所测SRs和SRe有无差异。SI模式下心尖长轴观定性观察健康人、冠心病和扩张性心肌病患者左室各节段的彩色分布;改变成像角度,定性观察室壁彩色变化。结果SL改变时SRs和SRe显著变化,SRI二维图像与曲线质量亦发生变化;由于角度的影响,健康人、冠心病和扩张性心肌病患者均有反相应变节段,改变成像角度,室壁彩色分布亦发生变化。结论SI和SRI受角度和应变长度影响,实际应用中应注意切面和取样部位的选择及仪器的设置。
Objective To investigate the effect of the included angle and strain length (SL) between the wall and incident ultrasound on the strain-rate imaging (SRI) and long-axis strain imaging (SI). Methods SRI quantitative analysis mode, the sampling volume of healthy people and patients with coronary heart disease was placed in the middle of the posterior septum, SL were set to 2mm, 12mm and 20mm, systolic and early diastolic peak strain rate (SRs and SRe) were measured, Compare the difference of SRs and SRe measured under different SL conditions. The longitudinal distribution of left ventricular mass in healthy subjects, patients with coronary heart disease and dilated cardiomyopathy was observed qualitatively by observing the colorimetric distribution of the left ventricle in SI mode. The imaging angle was changed to observe the color change of the ventricular wall. Results The change of SRs and SRe were significant when SL was changed, and the two-dimensional images and curve quality of SRI also changed. Due to the influence of angle, there were anti-phase strain segments in healthy people, patients with coronary heart disease and dilated cardiomyopathy, Color distribution also changed. Conclusion SI and SRI are affected by the angle and strain length. In practical applications, attention should be paid to the choice of section and sampling location and the instrument settings.