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Threshold and edge smoothing parameters for changes in opacity. (A) Opacity is shown as a function of voxel intensity, where voxels having an intensity value greater than the upper limit appear completely opaque and voxels with an intensity value inferior to the lower limit appear invisible, having a zero-opacity value (see Appendix); (B) Selection of a Region of Interest (ROI) to enable cropping of the rendered 3D echocardiographic volume.
