A diagnostic device, comprising: an output device; and at least one processor operatively coupled to the output device, the at least one processor being configured to: perform a first scan of a heart using a set of electrodes in a catheter that are currently active; deactivate one or more of the electrodes in the set that are not in physical contact with tissue of the organ that is part of one or more regions of interest in the organ or that are associated with one or more non-conductive regions of the organ based on data that is collected as a result of the first scan; tune the set by activating one or more electrodes in the catheter that are inactive, wherein tuning the set includes: identifying a region of interest in the heart having an activation index that falls within a predetermined range, wherein identifying the region of interest includes performing focal and rotational activation detection, wherein the activation index is the number of heartbeats that demonstrate the focal or rotational activation; and activating a first electrode in the catheter when activating the first electrode causes the activation index of the region of interest to be increased; perform a second scan of the heart using electrodes in the set that are currently active after the tuning is performed, and generating a map of the heart based only on data collected as a result of the second scan; and output the map of the heart using the output device. an output device; and at least one processor operatively coupled to the output device, the at least one processor being configured to: perform a first scan of a heart using a set of electrodes in a catheter that are currently active; deactivate one or more of the electrodes in the set that are not in physical contact with tissue of the organ that is part of one or more regions of interest in the organ or that are associated with one or more non-conductive regions of the organ based on data that is collected as a result of the first scan; tune the set by activating one or more electrodes in the catheter that are inactive, wherein tuning the set includes: identifying a region of interest in the heart having an activation index that falls within a predetermined range, wherein identifying the region of interest includes performing focal and rotational activation detection, wherein the activation index is the number of heartbeats that demonstrate the focal or rotational activation; and activating a first electrode in the catheter when activating the first electrode causes the activation index of the region of interest to be increased; perform a second scan of the heart using electrodes in the set that are currently active after the tuning is performed, and generating a map of the heart based only on data collected as a result of the second scan; and output the map of the heart using the output device. perform a first scan of a heart using a set of electrodes in a catheter that are currently active; deactivate one or more of the electrodes in the set that are not in physical contact with tissue of the organ that is part of one or more regions of interest in the organ or that are associated with one or more non-conductive regions of the organ based on data that is collected as a result of the first scan; tune the set by activating one or more electrodes in the catheter that are inactive, wherein tuning the set includes: identifying a region of interest in the heart having an activation index that falls within a predetermined range, wherein identifying the region of interest includes performing focal and rotational activation detection, wherein the activation index is the number of heartbeats that demonstrate the focal or rotational activation; and activating a first electrode in the catheter when activating the first electrode causes the activation index of the region of interest to be increased; identifying a region of interest in the heart having an activation index that falls within a predetermined range, wherein identifying the region of interest includes performing focal and rotational activation detection, wherein the activation index is the number of heartbeats that demonstrate the focal or rotational activation; and activating a first electrode in the catheter when activating the first electrode causes the activation index of the region of interest to be increased; perform a second scan of the heart using electrodes in the set that are currently active after the tuning is performed, and generating a map of the heart based only on data collected as a result of the second scan; and output the map of the heart using the output device.