Four-dimensional (4D) computed tomography (CT) is simulated by first generating a surface mesh from a single thoracic CT scan. Tetrahedralization is applied to the surface mesh to obtain a first volume mesh. Finite element analysis, using boundary constraints and load definitions, is applied to the first volume mesh to obtain a lung deformation according to an Ogden model. Constrained tetrahedralization, using control points, is applied to the lung deformation to obtain a second volume mesh, which is then deformed using mass-spring-damper simulation to produces the 4DCT.四維(4D)電腦斷層掃描(CT)之模擬係首先從單一個胸部CT掃描來產生表面網格，然後對該表面網格實施四面體化來得到第一立體網格，再使用邊界限制及負荷定義而對該第一立體網格實施有限元素分析來得到根據Ogden模型之肺形變，然後使用控制點而對該肺形變實施有限制的四面體化來得到第二立體網格，再使用質量-彈簧-阻尼模擬使該第二立體網格變形來產生出4DCT。
