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Multi-level measurements of the THV on MSCT. The THV expansion area was measured at four levels on MSCT: (1) THV inflow, (2) native annulus, (3) mid-THV, and (4) THV outflow. THV depth calculated as [distance from STJ to THV inflow]–[STJ height], i.e. distance from (1) to (2). STJ height was used pre-procedural MSCT measurement. THV, transcatheter heart valve; MSCT, multi-slice computed tomography .
