Mesh Human Phantoms with MCNP
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1 LAUR Mesh Human Phantoms with MCNP Casey Anderson Karen Kelley, Tim Goorley Los Alamos National Laboratory U N C L A S S I F I E D Slide 1
2 Summary Monte Carlo for Radiation Transport MCNP MCNP with Abaqus/CAE Computational Phantoms Examples Snyder Head, Zubal Head, VIP-Man, XCAT, UM Lungs Future Work Conclusion Acknowledgments U N C L A S S I F I E D Slide 2
3 Monte Carlo for Radiation Transport A stochastic method of determining a solution Random sampling Radiation - subatomic particle Carries energy Interacts with matter Any one event undergone by a particle is random Collision physics & nuclear data determine probabilities Large sample = statistical result Random number Random number Sample the source (Location, Energy, Direction) Track the particle Sample the collision (Location, Interaction Type) U N C L A S S I F I E D Slide 3
4 Monte Carlo for Radiation Transport: Random Walk U N C L A S S I F I E D Slide 4
5 Monte Carlo n-particle (MCNP) Developed and maintained by Los Alamos National Laboratory, with thousands of users worldwide for neutral and charged particle transport 11,000 requests in 10 years Applications: nuclear reactor fuel cycles, medical radiation therapy, shielding, homeland security, isotope production Calculates flux, dose, energy deposition based on nuclear interactions within the geometry Uses constructive solid geometry (CSG) to define threedimensional space User specifies bounding surfaces and cells Tedious and time consuming for complex geometries U N C L A S S I F I E D Slide 5
6 Why am I here? U N C L A S S I F I E D Slide 6
7 Spoiler Alert! We can now use a finite element mesh from Abaqus/CAE as the geometry description for particle transport in MCNP6 Easy creation of geometries, 3D visualization capabilities, multiphysics analysis with the mesh U N C L A S S I F I E D Slide 7
8 How its done: Hybrid Geometry The mesh is embedded in the CSG background All mesh types supported Transport through the CSG and mesh universe Element-to-element Energy deposition, flux calculated in the mesh Results can be used for 3D visualization and multi-physics analysis Embedded Mesh CSG Background CSG Universe U N C L A S S I F I E D Slide 8
9 How it's done: Multi-Physics Analysis PROGRAM MCNP6 RESULTS Energy density in the mesh Python script Power density at nodes Abaqus/CAE Power density at integration points U N C L A S S I F I E D Slide 9
10 Application to Health Physics U N C L A S S I F I E D Slide 10
11 Computational Phantoms Mathematical Phantoms Equations for surfaces, volumes Tomographic Phantoms Developed from CT/MRI data Zubal Head Snyder Head MIRD-5 Adult Male XCAT VIP-Man U N C L A S S I F I E D Slide 11
12 Testing of the Hybrid Capability No CAD/CAE tomographic solid models readily available Meshing issues with XCAT phantom, developed in CAD Generated hexahedra mesh from the voxelized lattice geometry Snyder Head, Zubal Head, VIP- Man, XCAT Fill material Created an analytical Snyder Head in Abaqus/CAE U N C L A S S I F I E D Slide 12
13 Examples U N C L A S S I F I E D Slide 13
14 Snyder Head Phantom Mathematical model from W.S. Snyder 4 mm and 8 mm voxelized models converted into an Abaqus/CAE mesh Created solid model in Abaqus/CAE using the analytical equations Allows comparison of voxelized CSG, voxelized mesh, and unstructured mesh models for various resolutions 10 cm diameter photon beam Mesh tallies used as a comparison U N C L A S S I F I E D Slide 14
15 Snyder Head Phantom 8 mm 4 mm Unstructured Voxelized Voxelized Mesh U N C L A S S I F I E D Slide 15
16 Snyder Head Phantom: Photon Flux Results (particles/cm^2) 8 mm 4 mm Unstructured Voxelized Voxelized Mesh U N C L A S S I F I E D Slide 16
17 Snyder Head Phantom: Flux Comparison U N C L A S S I F I E D Slide 17
18 Snyder Head Phantom: MCNP Computer Run Time Model Parts Elements 8 mm (Mesh) 4 mm (Mesh) Analytical (Mesh) ** 8 mm (CSG) Analytical (CSG) Volume (cm 3 ) % Analytical Volume * Run times for 100 million histories ** Unstructured Mesh,.2 cm seed size Processing (min) Transport * (min) 64 28,553 3, % , ,484 3, % , ,150 2, % , ,553 3, % ,213 2, % U N C L A S S I F I E D Slide 18
19 Zubal Head Phantom: Photon Flux (particles/cm^2) U N C L A S S I F I E D Slide 19
20 Visible Photographic Man (VIP-Man) 4 mm resolution model provided by Dr. X George Xu In MCNP lattice format Optimized to reach 30k 50k elements per part Fat, muscle, and bone divided into multiple parts Volumetric Iodine-131 source placed in the thyroid Common treatment used for hypothyroidism Source set in the thyroid 60 MBq (1.62 mci), 55% uptake Dose calculation to the testes Posterior Anterior photon source U N C L A S S I F I E D Slide 20
21 Voxelized 4 mm VIP-Man: Geometry Abaqus/CAE Viewer MCNP Plotter U N C L A S S I F I E D Slide 21
22 Voxelized 4 mm VIP-Man: Split Model U N C L A S S I F I E D Slide 22
23 Voxelized 4 mm VIP-Man: Optimization Parts Max. Elements Avg. Elements Pre- Processing (min) Transport (min) * Memory (GB) ,491 26, , ,543 16, , ,543 11, , ,709 11, , **108 35,199 11, , Processor GHz Intel Xeon X7542 * Run times for 100 million histories ** Torso Model (No Legs) U N C L A S S I F I E D Slide 23
24 Voxelized 4 mm VIP-Man: Thyroid Source Energy Deposition (MeV/gram) U N C L A S S I F I E D Slide 24
25 Voxelized 4 mm VIP-Man: Thyroid Source MCNP Results Mass (g) Dose (Mev/g) Dose (J/kg) msv Prostate E E (.09) Testes E E (.40) Thyroid E E E+04 Society of Nuclear Medicine Procedure Guideline for Therapy of Thyroid Disease with Iodine-131 (Sodium Iodide) 3 Mbq/gram, 55% uptake Dose to testes (20 g thyroid) mgy/mbq = 1.56 msv U N C L A S S I F I E D Slide 25
26 Voxelized 4 mm VIP-Man: PA Source U N C L A S S I F I E D Slide 26
27 Voxelized 4 mm VIP-Man: PA Source U N C L A S S I F I E D Slide 27
28 Voxelized XCAT Phantom: 6.25 mm resolution U N C L A S S I F I E D Slide 28
29 Unstructured Mesh Lungs Model U N C L A S S I F I E D Slide 29
30 Future Work Testing full body unstructured mesh human phantoms Currently only UM sections and voxelized mesh models Dose conversion factors Dose calculations with neutrons Include other particles Limited to neutrons and photons U N C L A S S I F I E D Slide 30
31 Conclusion The unstructured mesh capability in MCNP6 allows generation of complex geometries, improved 3D visualization capabilities, and multi-physics analysis Detailed computational phantoms with unstructured mesh can be generated and used for dose assessment Anatomically detailed, patient specific Dose calculation results compared well for simple iodine thyroid source Abaqus/CAE is a useful tool for generating complex geometries, meshing for particle transport, multi-physics analysis, and visualization U N C L A S S I F I E D Slide 31
32 Acknowledgments Karen Kelley Tim Goorley Steve McCready Chelsea D'Angelo David Crane Roger Martz George Xu (Rensselear Polytechnic Institute) Paul Segars (John Hopkins / Duke University) George Zubal (Yale University) U N C L A S S I F I E D Slide 32
33 LAUR Mesh Human Phantoms with MCNP Casey Anderson Karen Kelley, Tim Goorley Los Alamos National Laboratory U N C L A S S I F I E D Slide 33
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