Loading annotation file/s

Loading annotation file/s

Annotations are time marks that usually symbolize certain characteristics in the original signal. For instance, ECG main beat waves and their boundaries are considered as annotations which allow further advanced signal processing analysis. These annotations can be provided either by some BioSigBrowser algorithm or by external software or even by clinicians in certain databases.

Annotations are stored in files with a particular format. Formats supported are: MIT/WFDB format, and Matlab® format (designed for BioSigBrowser, for more information, see Annotations Format section).

To display annotations superimposed with the signal, follow “Actions” -> “Display annotation file/s”. By default, annotation files are searched in the results folder generated by the interface at the beginning of the session (remember that its name is “iBdir”).

Example

Supposing we loaded an ECG recording and we used the ECG detector/delineator to extract beat waves and boundaries of these waves, then the annotation files generated would be in the “iBdir” folder or in the results folder if we had changed it.

 

Annotation file/s to be displayed superimposed in the signal.

More than one annotation file can be selected to be displayed.  Usually, each annotation file corresponds to a specific lead (Thinking of single lead detection).

Relationship between leads and annotation files to be displayed. The content of the annotation file loaded previously will be displayed in the lead selected by user or by auto-detection.

Selecting one of the annotation files, user can chose on which lead want to superimpose the annotations.  Auto-detection is available only if the annotations file name ends as the label of the lead which corresponds.

Annotations to be shown in the Signal Window.

 

Then, user selects the annotations to display.

 

Signal Window: annotations displayed on V1 lead.

 

Now the information related with the current BioSigBrowser session is updated and the loaded annotation file is shown in the top of the panel in the Signal Window.

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