Research On Cardiac Superficial Modeling Based On Improved Snake Model

The heart plays an important role in the circulation of the human body, andhas the irreplaceable importance. it is the source of power of the humancirculatory system. The heart is a complex integrated system, and a collection ofimportant characteristics of electrophysiology and dynamics, also have importantapplications in fluid mechanics of blood, focused on a nerve, biochemical controland other aspects of function. Modeling has great advantages in the performanceof complex biological problems, and with the help of the strong computingfunction of the computer, a fast and accurate and intuitive graphical processingand display functions, which provides a convenient, effective way on the study ofthe real heart and establish3D heart model.In this paper, we put forward the method of heart surface modeling based onimproved Snake model based on the analysis of the achievements in scientificresearch of heart modeling technology in recent years, First of all, we select theimproved Snake model, namely the snake model of prior shape, use the data formodeling and Analysis, based on the extraction of surface and the discrete datapoint of heart CT images, the snake model of prior shape improve theperformance of Snake model the precise positioning in the weak edge of thetarget area and resisting the noise, increase the ability to capture around the targetcurve; Then, we combine the basic principle of finite element equations and thebiomechanical to realize the establishment of the equations of motion. In order tomeet the needs of finite element method for each element strain vector, need toquickly establish a group of tetrahedral element stored by list. and through theanalysis of the generation algorithm of tetrahedral mesh, the rapid generationalgorithm of tetrahedral mesh are presented; Finally, use the constraint conditionsof improved Snake model and combine with the methods of estimation in themovement of the non rigid body to calculate the displacement vectors of change of each node with surface finite element division and establish the motion modelof the heart surface. The final simulation experiment show that the finite elementmodel of the heart surface motion based on improved Snake model has importantsignificance in the analysis of cardiac systolic, diastolic and strain.