3D Medical Image Volume Rendering Research On Mobile Platform

With the rapid and continuous development of medical diagnostic technology and medical imaging equipment, three-dimensional medical image data is playing an in-creasingly important role in the clinical diagnosis and scientific research. At the same time, with the GPU and Open GL ES 3.0 appear on mobile platforms, more and more mobile devices have the technical foundation to achieve a three-dimensional medical image volume rendering. Currently three-dimensional medical image volume render-ing system for mobile platforms, almost all based on Open GL to achieve and have poor scalability, but VTK open source library for three-dimensional medical image operations has good support, so how to use the open source library VTK achieve three-dimensional medical image data volume rendering system on a mobile platform has be-come a new direction. In this paper, we consider how to implement three-dimensional medical volume rendering system on mobile platform from three aspects including overall design, volume rendering algorithm optimization and implementation.Firstly, this paper describes the volume rendering system from the perspective of the overall design, including hardware frame, software framework and system ar-chitecture. The hardware frame including X-ray mobile C-arm, graphics workstations and mobile devices, are responsible for data collection, reconstruction and intelligent volume rendering. Software framework is described in volume rendering system of business processes; system architecture describes. This section has important signifi-cance for guiding the implementation of the system.Secondly, there are some problems on prototype system. The system’s volume rendering and interaction is slow and drawing quality is poor. For the phenomenon that the system’s interactive speed is obtuse and volume rendering needs a long time, papers use method that is based on VTK and GPU to optimize ray-casting algorithm, so that the system’s first volume rendering only needs little time and the system meet the standard of real time interaction. For the problem of low graphics quality, we proposed a method of using a lookup table of pre-integration to achieve Ray Casting algorithm’ s volume data classification process. This method greatly enhance the clarity of the results of volume rendering, to meet the basic needs of the medical diagnosis.Finally, this paper presents some feasible and effective solutions for specific problems of prototype system. For the question that how to ensure that the three-dimensional medical image data’s completeness and correctness during the transmis-sion of the wireless network, we designed and implemented a transmission format, so that not only can ensure the integrity of the image data, but also to carry additional information about the patient and it has good versatility. This paper gives the concrete embodiment for VTK library’s cross-platform portability and use. For how to extract and display a meaningful part of the 3D medical image, we proposed combination of the two-dimensional image thresholding segmentation methods and iterative manner to obtain soft tissue and bone threshold,then using the thresholds for color-coded to show the different organs.