Handling Density Conversion in TPS.

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiotherapy Technology

Background:

• Accurate conversion of CT values to material densities is fundamental for radiation therapy planning.
• Current methods primarily use electron density for photon therapy, relying on Compton scattering principles.
• Particle therapy requires CT-to-stopping power conversion, directly linked to electron density.

Purpose of the Study:

• To evaluate a novel method converting CT values to physical density for radiation therapy.
• To compare the proposed physical density method with the conventional electron density approach.
• To highlight the importance of CT value conversion for both photon and particle therapy.

Main Methods:

• Investigated the conversion of CT values to physical density.
• Compared this new method with the established electron density conversion.
• Analyzed the impact on dose calculation in photon and particle therapy planning systems.

Main Results:

• The physical density conversion method shows potential for increased speed and accuracy.
• Electron density remains critical for TERMA and kernel calculations in photon therapy.
• CT-to-stopping power conversion is essential for accurate dose distribution in particle therapy.

Conclusions:

• Conversion to physical density presents a promising advancement for radiation therapy planning.
• Accurate density conversion is vital for precise dose calculations in photon and particle therapy.
• Further research into physical density methods could enhance treatment efficacy and safety.