超声背向散射积分对缺血性脑血管病患者颈动脉斑块的定量评价

Quantitative evaluation of carotid plaques of patients with cerebrovascular ischemia using integrated backscatter

目的应用背向散射积分(IBS)技术对缺血性脑血管病患者颈动脉斑块进行检测,研究不同回声斑块的性质及校正对IBS测值的影响。方法对50例缺血性脑血管病患者和30例临床上无脑血管疾病症状、体征的体检者颈动脉行彩色多普勒超声检查,测定斑块不同回声部分的IBS值及校正IBS值。结果病例组以混合回声和弱回声斑块居多。对照组以强回声斑块为主。增益1强、低、弱回声IBS值分别为(42.93±5.62)dB,(32.21±4.58)dB和(27.4±4.54)dB;增益2分别为(47.28±4.65)dB,(37.03±4.60)dB和(30.95±4.62)dB。增益1强、低、弱回声校正IBS值分别为2.44±0.24,1.64±0.11和1.33±0.15;增益2强、低、弱回声校正IBS值分别为2.38±0.24,1.66±0.10和1.35±0.14。相同增益条件下,强、低、弱回声3者之间IBS值有显著性差异。不同增益条件下,同一回声IBS值有差异。校正后,相同增益条件下,强、低、弱回声3者之间IBS值仍有显著性差异。不同增益条件下,同一回声IBS值无差异。结论应用IBS技术可以对斑块的强回声、低回声、弱回声进行定量分析。校正后的IBS值更客观、准确。

Objective: To identify the carotid plaques in patients with cerebrovascular ischemia using integrated backscatter(IBS) and provide a useful parameter for the risk of carotid plaques leading to cerebrovascular ischemia. Methods: With color Doppler flow imaging(CDFI) system, we detected the percentage of all kinds of carotid plaques; with IBS technique, different ultrasonic proterties of carotid plaques were measured. Results: Weak echo plaques and heterogeneous plaques were the majority in the patient group, whereas high-density echo plaques were predominant in the control group. Under the same gain condition, there were statistical differences among high-density, low and weak echoes. The differences were detected after correction. In the different gain situation, there were statistical differences in the IBS value of high-density, low and weak echoes. So is low echo or weak echo. After correction, there was no statistical differences in the IBS values of high density between different gains and in the IBS values of weak and low echoes. Conclusion: Quantitative analysis of IBS in different parts of carotid plaques(high density, low and weak echoes) is feasible. IBS value after correction is more objective.