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26. Fast tessellated solid navigation in GEANT4

Author

Poole, Christopher M, Cornelius, Iwan, Trapp, Jamie, Langton, C M, Poole, Christopher M, Cornelius, Iwan, Trapp, Jamie, and Langton, C M

Abstract

Navigation through tessellated solids in GEANT4 can degrade computational performance, especially if the tessellated solid is large and is comprised of many facets. Redefining a tessellated solid as a mesh of tetrahedra is common in other computational techniques such as finite element analysis as computations need only consider local tetrahedrons rather than the tessellated solid as a whole. Here within we describe a technique that allows for automatic tetrahedral meshing of tessellated solids in GEANT4 and the subsequent loading of these meshes as assembly volumes; loading nested tessellated solids and tetrahedral meshes is also examined. As the technique makes the geometry suitable for automatic optimization using smartvoxels, navigation through a simple tessellated volume has been found to be more than two orders of magnitude faster than that through the equivalent tessellated solid. Speed increases of more than two orders of magnitude were also observed for a more complex tessellated solid with voids and concavities. The technique was benchmarked for geometry load time, simulation run time and memory usage. Source code enabling the described functionality in GEANT4 has been made freely available on the Internet. 2012 IEEE.

Published
2012

27. Prediction of adjacent vertebral fracture risk associated with vertebroplasty : a computer-based simulation study

Author

Langton, C. M., Ahwal, F., Langton, C. M., and Ahwal, F.

Abstract

Vertebrplasty involved injecting cement into a fractured vertebra to provide stabilisation. There is clinical evidence to suggest however that vertebroplasty may be assocated with a higher risk of adjacent vertebral fracture; which may be due to the change in material properties of the post-procedure vertebra modifying the transmission of mechanical stresses to adjacent vertebrae.

Published
2009

32. The physical measurement of bone

Author

Langton, C. M. (Christian M.), Njeh, Christopher F., Langton, C. M. (Christian M.), and Njeh, Christopher F.

Published
2004

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