How are electron beams of different field sizes produced?

The production of electron beams of different field sizes is primarily achieved through the use of different applicator cone attachments. Applicator cones are specifically designed to shape and direct the electron beam for various treatment areas. Each cone has a predetermined aperture size that determines the diameter of the electron field produced. By switching out these cones, practitioners can easily modify the field size to suit the needs of the treatment plan while maintaining the appropriate depth of dose distribution for the targeted area.

This method allows for precise tailoring of radiation therapy to the patient's specific tumor characteristics and treatment goals, ensuring effective treatment while sparing surrounding healthy tissue.

Other methods mentioned, such as adjusting energy levels or varying patient positioning, do not directly influence the field size of the electron beams. Manual calibration settings primarily relate to machine parameters rather than changing the physical properties of the electron beam itself.