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In this paper we suggest an approach to a completely automatic contouring the left ventricle (LV). We use the method of signatures to describe the shape of the contour. Analysis of contours performed manually enables us to conclude that the signature of any contour of any patient has the shape of the inverted letter "M". This allows reducing the contouring problem to the problem of signature reconstruction. So, the task is transferred from a two-dimensional space in a one-dimensional. Algorithmfatcat:cj2yf5prb5ctlphhft7o3fai4u