Monte Carlo simulation of a cone-beam CT system for lightweight casts

Cone-beam computed tomography (CBCT), a modern technique with many applications, is becoming increasingly important and essential in many areas of economics and life. CBCT equipment has been commercialized in both hardware and software. However, having a device system suitable for a specific group of objects will be the best. This work used Monte Carlo simulation to optimize the design of a Cone-beam Computed Tomography (CBCT) for lightweight and small-size casts. Factors affecting image quality such as radiation-source, flat-panel detector, and geometrical distance were investigated. Simulation results indicate that an X-ray generator with a focal spot size of 4 × 4 μm², high voltage of 240 kV, and a radiation intensity of 10^13 photon/s with a flat panel CsI (Tl) detector of 0.3 mm thickness and a pixel size of 0.1-0.2 mm, is suitable for a CBCT to inspect small objects in industry. The Monte Carlo model was validated against experiments and to evaluate some characteristics of the existing system.