The invention relates to a method of deriving the myocardial region from one
or more MR images. Left and right ventricle contours (1, 2) are determined.
The thickness or width (D) of the myocardial region is computed from the distance
between these contours in a predetermined part (A) of the image (images). The location
of the myocardial region outside the preset region is derived on the basis of this distance.