Research On Medical Imaging Oriented Volume Data Analysis Method

PACS (Picture Archiving and Communication System) is mainly designed to store, translate and manage medical image data, but it can enable doctors observe and operate medical image data more intuitively by applying 3D reconstruction and interaction technologies.The dissertation comes from the project of 3D reconstruction model of He An PACS, which consists of 3D rendering,3D interaction,3D measuring, et.al. By studying 3D rendering and 3D interaction intensively, the dissertation presents two algorithms: spatial coherence based medical image rendering algorithm and widget based virtual surgical knife. The dissertation’s main content is as the following:(1) Spatial Coherence based medical image volume rendering algorithmSpatial information is of great significance for revealing the internal features of volume data. The traditional direct volume rendering based on transfer function is difficult to use the spatial information effectively. In this dissertation, the spatial information is introduced into direct volume rendering through the following two aspects. Firstly, for transfer function based on histogram, spatial coherence based on features is put forward to describe the space characteristic of features, which indicates the spatial gathering degree of voxels. Secondly, the dissertation proposes adaptive ray casting method considering the spatial coherence. The method can automatically adjust the color and opacity based on space coherence to optimize the rendering results. The algorithm has been applied in PACS successively.(2) Widget based Virtual Surgical knifeBy simulating common surgical operation, virtual surgical knife allows the doctor to cut 3D medical image data in his/her familiar manner, and the doctor can observe inner structure of 3D medical image data for better diagnosis. By designing several widgets, the doctor can intuitively interactive in 3D manner through keyboard and mouse. By utilizing programmable GPU, depth-peeling based volume cutting algorithm is implemented for interactive virtual surgical knife.