Determination of window size for baseline estimation of fetal heart rate using CTG

S. Das, K. Roy, C. Saha
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引用次数: 5

Abstract

One of the major features of fetal heart rate (FHR) is its baseline, the accurate classification of which is of utmost importance as all the other parameters of cardiotography (CTG) rely on it. Though guidelines for interpretation had been put forward by different organizations, they not only lack uniformity, but also are not definite, hence, difficult to implement in automated systems. We aim to propose a standardized baseline estimation algorithm addressing these issues. Baseline was calculated within continuous sliding window of duration 10 minutes and varying slide-lengths. The best slide-length is chosen and the corresponding baseline value is compared with the one obtained with discreet window as suggested by NICHD [1] and the estimate given by three experienced physicians. The results are analyzed using standard statistical methods such as confidence level, error margin, standard error etc. at a Confidence Level of 95%. The results of the algorithm and mathematical calculations incorporated in this work is found encouraging. Thus the proposed algorithm can not only be used to easily estimate the baseline using overlapping window but can also be adopted in an automated system for the interpretation of CTG.
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用CTG估计胎儿心率基线的窗口大小的确定
胎儿心率(FHR)的主要特征之一是其基线,其准确分类是至关重要的,因为心脏造影(CTG)的所有其他参数都依赖于它。虽然不同的组织提出了解释准则,但这些准则不仅缺乏一致性,而且不明确,因此难以在自动化系统中执行。我们的目标是提出一个标准化的基线估计算法来解决这些问题。基线在持续10分钟的连续滑动窗口内计算,滑动长度变化。选择最佳幻灯片长度,并将相应的基线值与NICHD[1]建议的离散窗口值和三位经验丰富的医生给出的估计值进行比较。采用置信水平、误差范围、标准误差等标准统计方法对结果进行分析,置信水平为95%。本文所采用的算法和数学计算结果令人鼓舞。因此,该算法不仅可以方便地利用重叠窗口估计基线,而且可以应用于CTG自动解译系统中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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