3D Slicer Architecture and Implementation.ppt

1、3D SlicerArchitecture andImplementation,Steve Pieper, PhD,2,Goals,NA-MIC Kit: Software and Methodologies for Medical Image Computing Facilitate Research Promote Interoperability Stable, Cross-Platform Run Time Environment Full Set of Core Features Avoid Duplicated Effort Flexible Module Architecture

2、 Plug-ins should be As Simple As Possible,Overview,MRML, Logic, GUI Core Libraries and Dependencies Some Details of MRML Modules,3,4,Slicer3 “Observer MVC” Pattern,MRML (Model) For Scene Description and Application State MRML Nodes are Persistent and Undoable Scene and Nodes are Observable Logic Enc

3、apsulate VTK and ITK Pipelines (Controller) Observe MRML to Configure Pipelines Help Create/Manage Nodes No UI Components (no Widgets, Actors, Mappers, Renderers or RenderWindows) GUI (View) Observe and Edit MRML Interact with User and Display Hardware Modules Should Follow Same Conventions,Logic,MR

4、ML Nodes,GUI,Widgets,Renderers,Edit,Observe,Observe,Observe,Edit,Edit,“Observe” means generic event mechanisms are used to pass information. “Edit” means code can directly call methods. Example: GUI can call methods in Logic classes,but Logic cannot call GUI methods. MRML cannot call Logic or GUI me

5、thods. There can be many observers for any event.,5,Example: EM in Slicer3,MRML,Logic,GUI,Global Parameters Hierarchical parameters Image data Segmentation output,Manage MRML nodes API for access to parameters Manage hierarchy Segmentation algorithm,Window to parameter set Wizard Interaction with im

6、ages,6,Example: EM Batch Tool,MRML,Logic,CLI,Global Parameters Hierarchical parameters Image data Segmentation output,Manage MRML nodes API for access to parameters Manage hierarchy Segmentation algorithm,Command Line Parsing Load Parameter Description MRML Scenes,Library Dependencies,7,vtkITK, vtkT

7、eem,8,ITK,VTK,Tcl/Tk,Teem,KWWidgets,vtkTeem,vtkITK,MRML,SlicerBaseLogic,SlicerBaseGUI,Slicer3,Teem: Multidimensional Raster Image Library (Gordon Kindlmann) Includes NRRD File Format ExtensiveTensor Manipulation Utilities vtkTeem, vtkITK: Create VTK Compatible Filters using ITK and Teem Code for Imp

8、lementation Includes vtkITKArchetype* Readers and Writers Implemented with ITK I/O Factories,MRML,9,ITK,VTK,Tcl/Tk,Teem,KWWidgets,vtkTeem,vtkITK,MRML,SlicerBaseLogic,SlicerBaseGUI,Slicer3,MRML: Medical Reality Markup Language Library Provides Central Data Representation for Slicer3 Application State

9、 is Explicitly Described in MRML GUI and Modules: Observe MRML to Learn of Changes to State Manipulate State to Reflect User Interaction and Calculation Results,SlicerBaseLogic,10,ITK,VTK,Tcl/Tk,Teem,KWWidgets,vtkTeem,vtkITK,MRML,SlicerBaseLogic,SlicerBaseGUI,Slicer3,Utility Code for Implementing Ba

10、se Application Functionality Input/Output Volume Reslicing Image Filters No Rendering, and No GUI Code,SlicerBaseGUI,11,ITK,VTK,Tcl/Tk,Teem,KWWidgets,vtkTeem,vtkITK,MRML,SlicerBaseLogic,SlicerBaseGUI,Slicer3,KWWidgets Subclasses vtkSlicerApplication Custom KWWidgets Rendering Utility Code VTK 3D Wid

11、get Subclasses,12,Scene Description,Provided by D. Gering,MRML Concepts,Node Unit of Organization for MRML Group of Variables Representing an Object or Concept State Scene Slicer Application has Single Scene Instance that has Collection of Nodes and API for Access/Create/Delete Undo/Redo these APIs

12、have been designed for scriptability) Editor is extensive Tcl-based Module Several Python examples are included in current svn trunk Python modules can also access Numpy routines for Numerical processing (Volumes and other DataArrays are directly mapped to Numpy arrays for easy manipulation),24,Comm

13、and Line Modules,Use the GenerateCLP command (provided with Slicer) to convert XML description of program arguments into a C+ .h file Main program of module uses PARSE_ARGS macro provided by .h file to instance variables corresponding to parameters defined in XML file PARSE_ARGS also defines a -xml argument that returns original XML string on stdout Slicer parses the XML to c