Infarcted fraction in a segment as a function of its relative level. A to H, evolution of the infarcted fraction in a segment (number in blue) as a function of its relative level (number in black) when the segment circumferentially travels through a defect-to-normal region edge; A to D, in case of an ideal tomography and E to H, for an altered resolution. The horizontal blue line shows the segment position. The vertical doted blue line represents the normal to defect edge position. The integration (in grey) of the activity in the segment at different polar positions gives the actual infarcted fraction in the segment as a function of its relative level (I).