What is the acceptable range for electron beam flatness?

The acceptable range for electron beam flatness is typically within 3%. This standard is crucial for ensuring uniform dose distribution in treatment areas during radiation therapy. Flatness refers to the variation in dose across the treatment field; thus, a 3% tolerance allows for minimal deviations, ensuring that the patient receives a consistent and predictable dose of radiation throughout the targeted area.

Maintaining this level of flatness is essential because even small inconsistencies can significantly affect treatment outcomes. If the flatness were allowed to be greater, such as 5% or more, it could lead to underdosing or overdosing certain areas, which could potentially compromise treatment efficacy or increase side effects. Hence, a 3% tolerance strikes a balance between practical measurement capabilities and the clinical necessity for dose precision.