Abstract
Many of methods already proposed observe a global motion of a outline of a cardiac muscle. MR Images (MRI) may observe the local motion of the cardiac muscle as the motion of tags.
In this paper, we propose a method to detect borders of tags in tagging MRI as meshed images using an active net. An image fitting energy of the active net decay with time compared with a distortion energy of the active net, since density and contrast of MRI fade out with time. The energy ill-balance causes decreases in the ability of the
active net. The active net is composed as the image fitting energy to keep the same contrast over a cardiac systole cycle. A behavior of detected meshed images represent a motion of cardiac muscle precisely, and play important roll of an assessment of a myocardial function and diagnosisses of heart diseases.
Finally, a usefulness of this method is shown by applying to a critical example.
