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HAPPENINGS

PRISM: A NEW SOFTWARE TOOL FOR SIMULATING REALISTIC CT DATA WITH CAD MODEL BASED OBJECTS

There is increasing desire to use simulations in the design of new X-ray systems for security applications and for characterizing the threat detection performance of existing systems and algorithms. Simulations can potentially overcome current challenges caused by limited access to raw experimental data.

To realize these potential benefits, simulations must model objects with realistic complexity. Also, simulations must correctly model system effects such as focal spot blur, detector response, beam hardening and scatter, so that the appearance of threat and non-threat features is realistically depicted in the resulting images.

We are developing a simulation tool capable of generating realistic computed tomography projection data, which overcomes current barriers presented by long processing times and high costs of full Monte Carlo simulations.

Our tool PRISM, the Particle/Ray Interaction Simulation Manager, as a simulation platform for x-ray or CT imaging in security applications is designed to be customizable and extensible and leverages existing tools such as GEANT4 for Monte Carlo simulation of photon trajectories or scatter, and TASMIP for the definition of the incident spectrum. Ray tracing can be used for accelerated calculation of the distribution of transmitted photons. Objects can be loaded from CAD models, enabling the modeling of complex objects. The detector module includes effects such as noise, crosstalk, gain, and lag.

Read more in our abstract describing our approach using PRISM to simulate the CT scan of a suitcase and present the effects of the detector model and the reconstructed CT images.

Download the full abstract here.

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