During the clinical study of different scanning MRI techniques, it is necessary to evaluate the image quality by measuring the signalnoiseratio.
在临床上研究不同的MRI扫描技术时，必须要用信噪比这个参数来对图像的成像质量进行评价。
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In order to improve the signalnoiseratio and the precision of the analysis, a "two-level sifting" is processed in recording and analyzing VLP by HOLTER.
Theoretical analysis and the results of simulation show that coherent accumulation can improve UWB radar target recognition probability in the condition of low signalnoiseratio.