tokens: a ) Stack of 2D MR images with respiratory motion artefacts , ( b ) SR based on CNNs , ( c ) the proposed ACNN - SR , ( d ) ground - truth high - resolution ( HR ) image , ( e ) low resolution MR image , ( f ) 2D segmentation resulting in blocky contours , ( g ) 3D sub - pixel segmentation from stack of 2D MR images using ACNN , ( h ) manual segmentation from HR image , ( i ) input 3D - US image , ( j ) FCN based segmentation , ( k ) ACNN , and ( l ) manual segmentation .