Making renal stones change size-impact of CT image post processing and reader variability
Making renal stones change size-impact of CT image post processing and reader variability
复制标题
DOI：
10.1007/s00330-011-2171-x
复制
发表时间：
2011-10-01
影响因子：
5.9
通讯作者：
Geijer, Hayenkan
中科院分区：
文献类型：
--
作者：
Liden, Mats;Andersson, Torbjoern;Geijer, Hayenkan
Objectives本研究的目的是量化图像后处理参数对表观肾结石大小的影响，并量化肾结石大小estimation.Methods包括肾或输尿管结石的50个CT数据集回顾性纳入前瞻性纳入期间内和读者间的变异性。每个CT数据集以不同的方式进行后处理，包括切片厚度、切片增量和窗口设置。在研究的第一部分中，一名阅片员使用不同的后处理参数重复估计肾结石的大小。在阅片者内变异性实验中，一位阅片者报告了间隔一周的相同图像的尺寸估计。从11位报告相同肾结石大小估计值的阅片者获得阅片者间变异性数据。结果根据图像后处理参数，表观结石大小不同，窗口设置实验（1.5 mm，p < 0.001）和切片厚度（0.8 mm，p < 0.001）的平均差异最大。参数的变化引入了偏倚和伪随机变异性。读者之间的变异性是相当大的比intra-reader variability.Conclusion我们的研究结果表明，需要标准化的CT图像上的测量。
Objectives The objectives of this study were to quantify the impact of image post-processing parameters on the apparent renal stone size, and to quantify the intra- and inter-reader variability in renal stone size estimation.Methods Fifty CT datasets including a renal or ureteral stone were included retrospectively during a prospective inclusion period. Each of the CT datasets was post-processed in different ways regarding slice thickness, slice increment and window setting. In the first part of the study a single reader repeated size estimations for the renal stones using different post-processing parameters. In the intra-reader variability experiment one reader reported size estimations for the same images with a one-week interval. The inter-reader variability data were obtained from 11 readers reporting size estimations for the same renal stones.Results The apparent stone size differed according to image post-processing parameters with the largest mean differences seen with regard to the window settings experiment (1.5 mm, p < 0.001) and slice thickness (0.8 mm, p < 0.001). Changes in parameters introduced a bias and a pseudo-random variability. The inter-reader variability was considerably larger than the intra-reader variability.Conclusion Our results indicate a need for the standardisation of making measurements on CT images.