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Mean Absolute Distance between paired Leaflets (MADL). Leaflet renderings of the two different images (meshed vs shadow) of the same mitral valve traced by the same observer are overlaid after minimizing their mean sum square difference. Agreement between the two renderings is apparent both from a viewing point situated above the posterior commissure (A) and from above the anterior horn of the mitral valve (B). (AL = anterior leaflet; PL = posterior leaflet.)
