Radiation dose assessement on dual and 16 slices MDCT using Monte Carlo simulation

Computed Tomography Dose Index (CTDI) is an important factor to estimate effective dose using the conversion factors. In this work, we estimated CTDI with Monte Carlo simulation using the (GATE/GEANT4) code. Two PMMA phantom diameters, 16 cm and 32 cm, have been used to simulate, respectively, the patient's head and body. The simulation was made at various kVp and mAs levels for dual and 16 slices Multi Detector Computed Tomography MDCT. Experimental CTDI measurements were performed with a calibrated pencil ion chamber and the two PMMAs. the comparison results between the simulated, measured and displayed values show slight differences. Indeed, a difference of less than 4% is noticed for the 2 slices and less than 2% for the 16 slices. The effectiveness of our method shows that GATE can be used to optimize the effective dose to reduce radiological risks in CT clinical applications.