心磁信号的测量误差分析

Analysis of Measuring Errors of MCG-signals

虽然心磁信号是采用超导量子干涉仪(SQUID)在屏蔽室内检测得到的,但在它的测量过程中总不可避免存在误差。为了提高心磁信号测量准确度以及分析心磁信号可信度,有必要进行误差分析。本文根据心磁信号的测量过程,分析了测量过程中可能产生的误差,针对心磁数据的特点设计了误差分析对象,应用误差理论进行分析计算,得出了通过SQUID测得的心磁信号包含明显的随机误差,无根据怀疑存在系统误差和粗大误差的结论。

Although magnetocardiography （MCG） signal is gained using SQUID in shielding rooms, measuring errors inevitably exist in its measuring process. In order to improve measuring accuracy of MCG signal and to analyze its reliability, it is necessary to analyze the errors. In this paper, we study measuring process of MCG signal and analyze the errors which would possibly come into the process. Then, aiming at characteristic of MCG data, we design the object of error analysis and make concrete analysis by error theory. We draw the conclusions that MCG signals measured by SQUID include obvious random errors and no system errors and crassitude errors.