LYCOS RETRIEVER 
3D Atlas: Users
built 640 days ago
A number of the above-referenced atlas-based 3D anatomical analysis systems are network based, but they all have practical limitations. SMART Atlas, for example, is not built on a true 3D dataset providing only those views available in the Franklin & Paxinos published atlas [7]. SHIVA from the LONI MAP group and MBIV used by Ma et al. each allows the user to slice a 3D set but only on planes orthogonal to one of the 3 standard anatomical orientations (coronal, sagittal & horizontal), not off-axis at an arbitrary angle which is often required in the course of a study. JAtlasView from EMAP does allow for arbitrary-angle slicing, but, as with SHIVA and MBIV, you must download the entire 3D data set you intend to visualize to your local machine and require special knowledge to properly install the sets. In addition, all of these implementations exist as islands in the Internet, with no real connections to other data sources. Only the PSC Volume Browser [23] used to view data from Siddiqui, et al. is fully implemented as a client-server architecture.
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The 3D Tooth Atlas is a software-based virtual environment that allows users to examine the morphology of the human dentition in full three-dimensional clarity. Each tooth can be rotated in three axes, rendered completely transparent to reveal the structures of its complex anatomy, and studied from all angles as well as from the inside out. The new version of this interactive CD-ROM now includes a mock National Board exam provided by the ADA, a highly annotated view of the entire skull, and the complete Glossary of Prosthodontic Terms, widely considered the standard among dental practitioners.
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The knife is presented as an intersecting plane within a wireframe rectangular volume whose dimensional extent is the x, y, z bounds of the 3D atlas dataset under view (Figure 2a). A series of tool buttons enables an user to specify how mouse dragging over the wireframe afects VK movement. The investigater may translate the knife along the slicing axis, or rotate it about any of the three cartesian axes. A series of buttons in the SV control panel enables the user to select the cutting axis to present slices along any one of the standard anatomical axes – coronal, horizontal, or sagittal (Figure 2b). Thus, a user can slice through the 3D data set in an arbitrary plane either on or off axis. Each user intiated VK movement triggers a request to the server resulting in an updated atlas image in the SV (Figure 2c).
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The atlas contains 3D descriptions of about 400 structures. Structures can be selected by their names and will then be drawn into displayed images, or the user can point and click in the images.
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