A Comparative Analysis of Methods for Evaluation of ECG Signal Quality after Compression

Figure 5

The resulting curves of the nine methods. (a) WDD, (b) CorrCoef of HRT, (c) similarity, and (d) sensitivity (SE) and positive predictivity (+P), and (e) PSim NN, PSim SDNN, PSim LF/HF, and PSim HF power were calculated as a mean of each of the 15 leads of all 125 ECG signals. The trends of the methods CorrCoef of HRT, SE, +P, and all four PSim methods are similar, although each method has a different range of values. The WDD method has a trend similar to the majority of the previously mentioned methods. Similarity has nonmonotonous trend and also incorrect values. Therefore, it cannot be recommended for further use. The red cross in (b) marks the breaking point in the quality of the signal. With upward trend of the value of avL, the CorrCoef of HRT changes only slightly, while with downward trend of the avL value, the CorrCoef of HRT sharply decreases.

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