低频凸阵探头对颈内动脉狭窄病变的诊断价值

Dianostic Value for Internal Carotid Artery Stenosis Using Lower Frequency Convex Probe

目的比较高频线阵探头与低频凸阵探头对颈内动脉狭窄患者的检测结果，提出低频凸阵探头在颈内动脉超声检测中的应用价值。方法随机选择30例经DSA证实的单倒颈内动脉狭窄≥70％的患者，比较高频线阵探头与低频凸阵探头检测颈动脉分叉以上的颈内动脉（ICA）的显示长度，狭窄段，狭窄远段最高峰值血流速度（PSV）的差异，分析狭窄段、狭窄远段流速与ICA显示长度的相关性，以及血管狭窄的检出符合率。结果低频凸阵探头检测ICA的长度较高频线阵探头明显增加。分别为6.12±0.82cm和2.61±0.54cm，（P〈0.01）。低频凸阵探头测得的狭窄段PSV，平均高于高频线阵探头285.7±110.8cm／s，（P〈0.01），狭窄远段PSV与狭窄段PSV和ICA检测长度呈负相关关系（r=-0.926，r=-0.953）。两种探头对颈动脉狭窄检测与DSA结果的符合率分别为93.3％，73.3N。结论低频凸阵探头可以提高ICA的显示长度，更有利于对ICA中远段血管病变及血液动力学的观察，提高了超声技术对ICA狭窄检测的准确率。

Objective To compare the results of patients with intemal carotid artery stenosis by means of high frequency linear-array probe（HFLP） and lower frequency convex probe（LFCP）, we Proposed the application value of LFCP for the carotid ultrasound examintion. Methods We selected 30 consecutive patients with ipsilateral carotid stenosis equal or greater than 70% confirmed by subtraction digital angiography （DSA） and compared the divergence between the LFCP measurement of the length of internal carotid artery （ICA） upper to the carotid bifurcation, peak systolic velocity（PSV） in narrow position and its distal segment in theinternal carotid artery. The ICA were analysed. At the same time, the degree of ICA stenosis tested by the two methods was compared to DSA. Results The imaging length of ICA showed by LFCP was significantly greater than that of HFLP, 6.12±0.82cm and 2.61±0.54cm（P〈0.01） respectively, PSV measured by LFCP in stenosis segment was higher than of I-WLP, average 285.7±110.8cm/s（p〈0.01）. Otherwise, the PSV of distal ICA presented the negative correlation to length of ICA（r=-0.926） and PSV of exactly narrow position （r=-0.953）. The degree examined by two kinds of probe accoadding to DSA was 93.5% and 73.3% respectively. Conclusion LFCP may increase demonstrated the image length of ICA, benefitiate to observe the pathological changs and hemodynamics far distal length of ICA and enhance the scanning veracity of ultrasound technique for the internal carotid artery stenosis.