Procedures for processing and analysing a set of clinical CT images using the LA wall-mapping application. (A) LA delineation; (B) inner-boundary segmentation; (C) outer-boundary segmentation; (D) wall thickness calculation; and (E) 2D wall map generation. The colour bar shows the wall thickness. 1: right superior pulmonary vein (RSPV); 2 right inferior pulmonary vein (RIPV); 3 left superior pulmonary vein (LSPV); and 4: left inferior pulmonary vein (LIPV). The red dashed line indicates the annulus of mitral valve (MV).