关键词: 有限元, 互信息, 多分辨率

Abstract: Discrete finite element was used as basic unit to simulate and predict deformation of the whole elastomer for complexity of soft tissue deformation in medical image. The process of registration was regarded as solving 2D stress problem by finite element method. The finite element energy function was also improved. Mutual Information (MI) with high accuracy and robustness was selected as metric for solving equation. In order to improve registration efficiency, registration process was optimized by the multi-resolution strategy. By registration experiment for medical images in radiotherapy and comparison with the existing methods, better registration results were obtained. The proposed registration method is more sensitive to the rigid displacement and with improvement in speed. All that shows this registration method is of high precision and efficiency.

Key words: finite element, Mutual Information (MI), multi-resolution