Optimized Positioning of ECG Electrodes for WSN Applications - Application and Multidisciplinary Aspects of Wireless Sensor Networks - page 194

For every combination
of 4 leads

One combination
of 4 leads

Calculate Standard
12-lead ECG

MECG Caclulate PCs PCs

Reconstructed
12-lead ECG

Target 12-
lead ECG

Calculate the similarity
between reconstructed and
target 12-leads ECGs

Similarity
measures

Similarity
factors

Find best similarity factor

Best similarity
factor

Find combination of 4
leads that resulted in the
best similarity factor

Optimal leads

Fig. 9.10 Optimal leads selection with principal component analysis (PCA)

DL =− X i ( ) X j ( ). (9.26)

31

 =

For the MECG with 31 leads there are 465 possible differential leads.

 

2

However, in WSN applications, the implementation of a small wireless electrode,
whose measurement is emulated by DL, dictates the minimization of the distance
between electrodes of a DL. That requirement restricts the set of all possible DLs to