A method and system for segmenting diaphragm regions in a chest X-ray radiograph is disclosed. For example, the modified orthogonal codes can reduce the autocorrelation level so as not to exceed one-half the length of the modified orthogonal code. Each tissue retracting member is configured for slidable movement about the filament loop between a first position, wherein the tissue retracting member is spaced-apart from the surgical mesh, and a second position, wherein the tissue retracting member is positioned adjacent the surgical mesh to facilitate the retraction of tissue surrounding the tissue defect.