In vitro evaluation of ultrasound Doppler strain rate imaging:: Modification for measurement in a slowly moving tissue phantom
In vitro evaluation of ultrasound Doppler strain rate imaging:: Modification for measurement in a slowly moving tissue phantom
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DOI：
10.1016/j.ultrasmedbio.2003.08.006
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发表时间：
2003-12-01
影响因子：
2.9
通讯作者：
Heimdal, A
中科院分区：
文献类型：
--
作者：
Matre, K;Ahmed, AB;Heimdal, A
多普勒应变率成像（SRI）进行了评价，在体外使用硅胶条体模模仿缓慢移动的组织。开发了一种测试装置，该装置能够进行具有可变应变和应变速率的受控应变实验。在三种不同的泵速（组织速度为0.1、0.5和1.0 mm/s）下，在八种不同的计算应变（范围5.7 - 63.4%）下测量SRI应变。阐述了不同组织速度和应变样本大小对SRI应变测量结果的影响。当SRI应变测量为整个条带横截面的平均值且应变样本量为1.9 mm时，SRI应变与应变计算值一致（平均差异= 2.78%，组织速度1.0 mm/s的一致性限值+/- 9.97%，n = 8）。如果使用单个中心样本，特别是应变样本量为0.8 mm时，差异显著（平均差异=-7.47%，组织速度0.5 mm/s的一致性限值+/- 20.90，n = 24）。将应变样本量增加至1.9 mm消除了部分低估（平均差异为-4.46%，n = 24）。我们发现低内部和观察者之间的变化。这项研究表明，对于SRI方法，以准确估计应变，应变样本大小应在该地区的2毫米。平均超过几个超声（US）光束进一步提高了准确性。（电子邮件：Knut. med.uib.no）（C）2003年世界医学和生物学超声联合会。
Doppler strain rate imaging (SRI) was evaluated in vitro using a silicone strip phantom mimicking slowly moving tissue. A test apparatus was developed that enabled controlled strain experiments with variable strain and strain rate to be performed. SRI strain was measured at eight different calculated strains (range 5.7 to 63.4 %) at three different pump speeds with tissue velocity 0.1, 0.5 and 1.0 mm/s. The effect of varying tissue velocity and strain sample size on the measured SRI strain was elaborated. SRI strains agreed well with calculated values for strain when SRI strain was measured as the average over the whole strip cross-section and the strain sample size was 1.9 mm (mean difference = 2.78%, limits of agreement +/- 9.97% for tissue velocity 1.0 mm/s, n = 8). The variance was substantial if single central samples were used, especially for strain sample size of 0.8 mm (mean difference = -7.47%, limits of agreement +/- 20.90 for tissue velocity 0.5 mm/s, n = 24). Increasing the strain sample size to 1.9 mm removed some of the underestimation (giving mean difference of -4.46%, n = 24). We found low intra- and interobserver variation. This study indicates that, for the SRI method to give accurate estimates of strain, strain sample size should be in the region of 2 mm. Averaging over several ultrasound (US) beams increased the accuracy further.(E-mail: Knut.Matre@med.uib.no) (C) 2003 World Federation for Ultrasound in Medicine Biology.