indicated by 106 while valleys in the rs distributions will generally be 0 as indicated by 108 peaks may or may not equal the number of acquisitions used in the dea operation each peak in the rs distribution generally represents an edge peaks that are equal to the number of acquisitions performed in the dea operation generally indicate us edges and peaks that are less than the number of acquisitions performed in the dea operation generally indicate qs edges accordingly each peak is compared to the number of acquisitions as indicated at 110 and a determination is made at 112 that is based on the results of the comparing performed at 110 responsive to a determination at 112 that the peak is equal to the number of acquisitions performed in the dea operation the peak may be designated a us edge as indicated by 114 responsive to a determination at 112 that the peak is not equal to e g less than or more than the number of acquisitions performed in the dea operation the peak may be designated a qs edge as indicated by 116 us edges may be fully elaborated from the initial dba operation fig2 illustrates an example of a digital edge averaging dea process that may be used to determine us edge locations in accordance with certain embodiments of the disclosed technology in the example a dea display presents three averaged waveforms 240 a c.