Figure 7

A false negative lesion at LAA. (a–c) and (d–f) are the structure images and net retardance images of the lesion at 1 s, 8 s, and 33 s of ablation, respectively; (g, f) are photos of the TTC stained lesion on the endocardium and epicardium; (i) histology of lesion section with trichrome staining; (j) shows the cross-A-line averaged tissue birefringence change and the averaged tissue birefringence change.