<Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> Modern computed axial tomography and magnetic resonance imaging scanners can be used to create solid models of internal body features, so - called volume rendering . Optical 3D scanners can be used to create point clouds or polygon mesh models of external body features . </P> <P> Uses of medical solid modeling; </P> <Ul> <Li> Visualization </Li> <Li> Visualization of specific body tissues (just blood vessels and tumor, for example) </Li> <Li> Designing prosthetics, orthotics, and other medical and dental devices (this is sometimes called mass customization) </Li> <Li> Creating polygon mesh models for rapid prototyping (to aid surgeons preparing for difficult surgeries, for example) </Li> <Li> Combining polygon mesh models with CAD solid modeling (design of hip replacement parts, for example) </Li> <Li> Computational analysis of complex biological processes, e.g. air flow, blood flow </Li> <Li> Computational simulation of new medical devices and implants in vivo </Li> </Ul>

Which refer to a model that represent all the dimension of an object external as well as internal