A method is disclosed comprising: performing a first scan of an organ using a set of electrodes in a catheter that are currently active； deactivating one or more of the electrodes in the set based on data that is collected as a result of the first scan； tuning the set by at least one of (i) deactivating one or more electrodes in the set that remain active after the deactivating, and (ii) activating one or more electrodes in the catheter that are inactive； performing a second scan of the organ using electrodes in the set that are currently active after the tuning is performed, and generating a map of the organ based on data collected as a result of the second scan； and outputting the map of the organ for presentation to a user.
