Multiple scattering theory for total skin electron beam design

Area of Science:

• Medical Physics
• Radiation Oncology
• Beam Design

Background:

• Total skin electron irradiation (TSEI) requires precisely designed electron beams.
• Optimizing TSEI beam parameters is crucial for effective patient treatment.
• Current methods for beam design can be time-consuming and resource-intensive.

Purpose of the Study:

• To present a theoretical model for designing broad electron beams for TSEI.
• To accurately predict electron beam fluence and profile using Fermi-Eyges theory.
• To facilitate efficient design and optimization of TSEI clinical beams.

Main Methods:

• Developed a theoretical model based on Fermi-Eyges theory for electron beam transport.
• Incorporated beam tail removal through primary x-ray jaws into the model.
• Calculated planar fluence profiles for normally and obliquely incident beams.
• Validated the model using experimental measurements with ion chambers, film, and TLDs.

Main Results:

• The theoretical model accurately predicts electron beam energy and planar fluence at normal incidence.
• The model shows sufficient accuracy for oblique incidence, aiding in optimal angle selection.
• Experimental data confirm the model's predictive capabilities for TSEI beam design.

Conclusions:

• The developed theoretical model offers an efficient method for designing TSEI electron beams.
• This approach allows for rapid testing of multiple beam configurations, minimizing experimental effort.
• The model provides a valuable tool for optimizing clinical TSEI beam parameters, ensuring patient safety and treatment efficacy.