Study Of Medical Object Visualization

To fight with diseases, it is necessary to acquire varieties of anatomical and functional information, which represent the human physiological or abnormal status. Because of the super ability of human to obtain information by vision, in the area of clinical diagnosis, treatment, scientific research and education, etc., it is of great significance to describe the wealthy hidden information of medical objects in visual form. With the evolution of modern medical imaging technologies, the information obtained from human body rum to be more full and accurate, which greatly enriches the content of medical object. Conventionally, these information are viewed as films or digital 2D images, and the observers make analysis and diagnosis by imaging the 3D scene in their brain. So it is very difficult to accurately grasp the physiological or abnormal situation, geometrical characteristics of the object and spatial relationship with surrounding anatomical tissues. With the rapid development of computer technology and scientific computing visualization, it is possible to utilize the wealthy hidden information of medical objects in an illustrative, vivid and effective manner by visualization. Through processing medical objects with spatial property in static or dynamic 3D space, medical object visualization sufficiently illustrates the wealthy hidden information of medical objects in visual form. So it has bright future of application in the above-mentioned area. Study of medical object visualization is one of the hotspot of scientific research in the world currently.Virtual cardiac model provides the basis for study of the forward problem and inverse problem in electrocardiograph, and virtual endoscopy has great advantages over traditional endoscopy because of its non-invasive property, so it is meaningful to study these two medical objects by visualization.In this thesis the main research work is composed of designing and implementing a medical object visualization system and technique platform, and making in-depth visualization study on the two medical objects of virtual cardiac model and virtual endoscopy based on the platform. Specifically: The content and classification of medical object is deeply analyzed and discussed. A survey on medical object visualization is made, which comprises the history, research focus, current status and developing trend of medical object visualization and the research work and application of medical object visualization system. Especially, some fundamental algorithms of medical object visualization are introduced. Aim at the poor real-time problem of current medical object visualization systems, a thorough analysis of system architecture and technique implementation is made on the advanced VTK visualization toolkit softwareand the VolumePro real-time volume rendering hardware. Accordingly, a scheme for medical object visualization system and technique platform to solve the problem is provided, which is based on the integration of VTK and VolumePro. 4DView, which is a general real-time medical object visualization system and technique platform, is designed and implemented. 4DView provides varieties of visualization algorithms, including surface rendering algorithm, such as Marching Cubes, Dividing Cubes, etc., and volume rendering algorithm, such as Ray Casting, Texture Mapping, algorithm used in VolumePro, and so on. Thus, 4DView is able to act as scientific research platform because of its extensible design and implementation. Against the problems of complex interaction and requirement of professional knowledge in medical object visualization system, display protocol is designed and implemented primarily in 4DView, which is a possible scheme to solve those problems. Based on 4DView platform, research on visualization of LFX virtual cardiac model is carried out and primarily completed. The model itself and two key simulation results, Excitation Propagation Map and Body Surface Potential Map, are visualized after preproc...