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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Heart Rhythm. 2013 Oct 3;11(1):85–92. doi: 10.1016/j.hrthm.2013.10.007

Figure 3. Qualitative examples of IIR versus voltage mapping.

Figure 3

The figure illustrates different estimations of the extent of scar using EAM bipolar voltage (Panel A), IIR (Panel B), and intensity maps with scar threshold at 2 SD (Panel C) and 3 SD (Panel D) above the mean intensity of normal myocardium, projected onto the LA for two patients. The thresholds for scar identification (color scale) are constant across patients when using the bipolar voltage and IIR maps (Panels A and B), but vary for each patient with the dynamic intensity threshold technique (Panels C and D). Patient 1 (top row of images) exhibits large areas of low voltage on EAM indicative of fibrosis. The IIR map closely estimates the bipolar voltage map; however, the intensity maps with thresholds at 2 and 3 SD over- and under-estimate the extent of scar, respectively. Patient 2 (bottom row of images) exhibits minimal low voltage regions and predominantly healthy tissue on EAM. The IIR map closely estimates the bipolar voltage map; however, there is suboptimal agreement using dynamic intensity threshold maps at 2 and 3 SD.