Radiation dose in diagnostic radiology: Monte Carlo simulation studies

Area of Science:

• Medical Physics
• Radiological Physics

Background:

• Accurate estimation of radiation dose is crucial for patient safety in medical imaging.
• Understanding energy absorption and dose distribution in tissues is fundamental to radiological protection.

Purpose of the Study:

• To determine the radiation dose absorbed in water phantoms using Monte Carlo simulations.
• To calculate key dosimetric quantities including spatial energy absorption, rad/R conversion factors, and scatter-to-primary ratios.
• To compare relative absorbed doses under different radiographic imaging conditions.

Main Methods:

• Application of Monte Carlo calculations for radiation transport simulation.
• Modeling of monoenergetic incident x-ray beams with energies ranging from 15 to 100 keV.
• Inclusion of water phantom thicknesses from 5 to 20 cm in the simulation setup.

Main Results:

• Detailed spatial distributions of energy absorption within the water phantoms were computed.
• Rad/R conversion factors and average rad/R conversion factors were determined.
• Scatter-to-primary ratios of absorbed dose were calculated for various scenarios.
• Relative absorbed doses were compared based on achieving specific optical densities on radiographic film.

Conclusions:

• The study provides valuable data for the precise estimation of radiation doses in diverse radiographic procedures.
• The calculated dosimetric quantities can aid in optimizing imaging parameters to minimize patient exposure.
• Findings contribute to improved radiation safety protocols in diagnostic radiology.