Variability of ShearWave Velocity using Different Frequencies in Acoustic Radiation Force Impulse (ARFI) Elastography: A Phantom and Normal Liver Study
Variability of ShearWave Velocity using Different Frequencies in Acoustic Radiation Force Impulse (ARFI) Elastography: A Phantom and Normal Liver Study
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DOI：
10.1055/s-0032-1313008
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发表时间：
2013-06-01
影响因子：
3.4
通讯作者：
Lee, M. -J.
中科院分区：
文献类型：
--
作者：
Chang, S.;Kim, M. -J.;Lee, M. -J.
目的：为探讨声辐射力脉冲（ARFI）弹性成像中剪切波速度（SWV）在不同深度（2- 5cm）的变化规律，采用不同频率的凸面（1-4 MHz）和线阵（4-9 MHz）探头对弹性体模和正常肝脏进行ARFI弹性成像。在每个深度进行了10次有效SWV测量。使用体模重复10次，并在8名健康志愿者（男：女= 3：5，年龄20-34岁）中进行。结果：在体模和肝脏中，两个探头在同一深度测量的平均速度是不同的。两种探针在不同深度的SWV变异性也不同。体模中变异性较低的深度为4和5 cm（凸形探头）和2 cm（线性探头）。在肝脏中，具有较低变异性的深度为4 cm（凸形探头）和3 cm和4 cm（线性探头）。在两个探头的比较分析中，线性探头显示出较低的变异性在2和3厘米的深度在幻影和3厘米在肝脏，而凸形探头显示出较低的变异性在4厘米的深度在幻影和livers.Conclusion：SWVs和变异性是不同的深度和频率。低频探头的SWV在相同深度处有较高的趋势。为了减少SWV的变异性，建议使用高频探头深度为2-3 cm，低频探头深度为4- 5 cm。
Purpose: To assess the variability of shear wave velocity (SWV) from acoustic radiation force impulse (ARFI) elastography at various depths using different frequencies.Materials and Methods: ARFI elastography of the elasticity phantom and normal liver was performed at different depths (2-5 cm) with convex (1-4 MHz) and linear (4-9 MHz) probes. Ten valid SWV measurements at each depth were performed. This was repeated ten times with the phantom and performed in eight healthy volunteers (M: F = 3: 5, age 20-34 years). The mean value and standard deviation of the SWV were calculated.Results: In both the phantom and liver, the mean velocities as measured by two probes at the same depth were different. Variabilities of SWV at different depths were also different for the two probes. The depth with lower variability in the phantom was 4 and 5 cm with a convex probe and 2 cm with a linear probe. In the liver, the depth with lower variability was 4 cm with a convex probe and 3 and 4 cm with a linear probe. In comparative analysis of the two probes, the linear probe displayed a lower variability at a depth of 2 and 3 cm in the phantom and at 3 cm in the liver, whereas the convex probe displayed a lower variability at a depth of 4 cm in both the phantom and the liver.Conclusion: SWVs and variability are different depending on the depth and the frequency used. SWVs with a low frequency probe had a tendency to be higher at the same depth. To reduce variability of SWV, a high frequency probe is recommended for a depth of 2-3 cm, and a low frequency probe is recommended for a depth of 4-5cm.