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Multiplanar reformation (MPR) was used to create a double-oblique transverse plane. In this image the internal diameter of the existing bioprosthesis is manually traced, using the imaging software to calculate its cross-sectional area (mm2) and perimeter (mm). The operator then measured the minimum (Dmin = 22.4 mm) and maximum (Dmax = 23 mm) cross-sectional diameters.
