摘要
目的探讨使用不同频率探头、取样线角度和感兴趣区深度对剪切波速度（SWV）的影响。资料与方法利用弹性成像模型,使用凸阵探头测量SWV时,取样线角度取0°、1°~15°、16°~30°、31°~45°,感兴趣区深度取1 cm、2 cm、3 cm、4 cm、5 cm、6 cm、7 cm、8 cm;使用线阵探头时,感兴趣区深度取1 cm、2 cm、3 cm、4 cm,对SWV测量值进行比较。结果两种探头测值间差异有统计学意义（P〈0.05）;随感兴趣区深度增加,凸阵探头测值由高估转变为低估,线阵探头测值则始终表现为低估。使用凸阵探头时,深度和角度对SWV影响均具有统计学意义（F=85.87、35.96,P〈0.01）,且两者影响具有交互作用（F=17.63,P〈0.01）;取样线角度〈15°时,角度对测值影响较小,4 cm深度测值最接近标准值,5 cm时偏差最大。使用线阵探头时,深度对测值影响具有统计学意义（P〈0.05）,1 cm时,测值最接近标准值,4 cm时偏差最大。结论探头频率、取样线角度和感兴趣区深度均对SWV有影响。使用凸阵探头时,以取样线不超过15°、深度4 cm时测值较准确;使用线阵探头时,深度1 cm时测值较准确。
Purpose To investigate the influence on shear wave velocity （SWV） by different probe frequency, scanline angle and ROI depth. Materials and Methods The elasticity QA Phantoms was used in the study. First the SWV was measured by curve probe at depths of 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm and 8 cm. The scanline angle changed from 0° from midline, 1°-15°, 16°-30°and 31° -45°. Then the SWV was measured again by using line probe at depths of 1 cm, 2 cm, 3 cm and 4 cm. The measured data were analyzed statistically. Results The SWV showed difference by using the two probes （P〈0.05）. As depth increased, the measurement by curve probe changed from overestimate to underestimate, while the measurement by line probe always showed underestimate from standard value. When the curve probe was used, the angle and depth affected SWV interactively （F=85.87 and 35.96, P〈0.01）, and had interactive effects （F=I 7.63, P〈0.001）. When the scanline angle was within 15°, the angle had little influence upon the measurement. When the scanline angle was 0°, the measurement was the closest to the standard value at the depth of 4 cm, and the maximum deviation occurred at the depth of 5 cm. The influence of depth upon measurement had significant difference when the line probe was used （P〈0.05）. The measurement was the closest to the standard value at the depth of 1 cm, and the maximum deviation occurred at the depth of 4 cm. Conclusion Factors like probe frequency, scanline angle and ROI depth can affect the SWV. When the curve probe is used, the accurate measurement occurs at the depth of 4 cm when the scanline angle is within 15°. When the line probe is used, the accurate measurement occurs at the depth of 1 cm.
出处
《中国医学影像学杂志》
CSCD
北大核心
2014年第9期697-700,共4页
Chinese Journal of Medical Imaging
基金
河南省医学科技攻关计划项目(201303137)
关键词
超声检查
弹性成像技术
声触诊组织量化技术
剪切波速度
Ultrasonography
Elasticity imaging techniques
Acoustic radiation forceimpulse
Shear wave velocity
