关键词: 核磁共振图像, 形状恢复, 运动跟踪, 可形变模型, 左心室

Abstract: Recovering the shape and motion of the left ventricle from cardiac Magnetic Resonance Images（MRI） is a primary
topic in the community of medical image analysis.A new deformable model，which makes use of the priori knowledge of the left ventricle’s geometry sufficiently，for analyzing the shape and motion of the left ventricle，is presented.This new model is a generalized cylinder which is one-end closed，not axial symmetry and axis-curved.Parameters of the proposed model are functions which can capture the global and local deformation merely from global parameters.Using a physically-based approach，geometric models are converted into dynamic models，which deform under the forces computed from the data points and conform to the given dataset.From the tracked volumetric shape，one can monitor the evolution of the volume and mass of the left ventricle during one heart cycle and some clinically established indexes such as stroke volume and ejection fraction can be calculated; these measures are important for clinical use.

Key words: magnetic resonance images, shape recovery, motion tracking, deformable model, left ventricle