Modeling and Visualization Hajime Yoshida Naruto UE Interfacing G4 physics and planning systems 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

First Japan-Italy Workshop of Medical Applications of Geant4 Modeling; Geometry Construct G4 geometry DICOM driver (local file or network) Montreal example or further abstraction is necessary? Voxels of CT images or other modalities are associated with those of Geant4 Voxels are parameterized by their position and density Sensitive volume is defined for each voxel Study the possibility of polygons Polygon construction from voxels by a commercial s/w Next examples are taken from the Web pages of Kubota Graphics Tec. Co. 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

Colon for the virtual endoscope 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

Femoral artery and poumonary 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

First Japan-Italy Workshop of Medical Applications of Geant4 Visualization Use of Geant4 Visualization Visualization of parameterized volumes is implemented in G4 but we have to study what kind of tuning or refinements might be necessary for realistic cases Use of the commercial products for further functionalities Volume rendering Polygon construction from CT images Smoothing neighboring voxels Defining boundaries and polygons Compressing the number of polygons Relation with 3D stereo-vision Parallelization Overlapping with dose histograms Easy-to-use human interface (3D) Interface to HIMAC’s visualization system used for the planning system 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

First Japan-Italy Workshop of Medical Applications of Geant4 Analysis Dose Histograms Voxel based CT voxel density and dose per each voxel Volume based Comparison and overlap　relative to volumes Evaluation function? 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

Toolkits for medical applications Plan to Customize existing tools; MOMO Geometry creation Phantoms, various filters, bolus etc. Modeling from DICOM data over the network XML format Electromagnetic physics Tuned Standard and LE physics On-going integration with analysis tools JAS3 Plug-ins to JAS3; MomoPlugin and G4Plugin 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4

First Japan-Italy Workshop of Medical Applications of Geant4 Examples Material and geometry description XML a la GDML Eye phantom made yesterday morning 2000 water disks of 20 μm thickness Simplistic Physics list Just like exampleN02 Proton; hIonisation + multiple scattering No sensitive volume, just to visualize WIN32-VC7 (Visual C++ .NET) OGLWIN32 OpenGL viewer for Windows Run with GAG with Log window JAS3 plugins 4/17/2019 First Japan-Italy Workshop of Medical Applications of Geant4