How frequently must the constancy of linac output for photon and electron beams be checked?

The constancy of linear accelerator (linac) output for photon and electron beams must be checked daily to ensure accurate and consistent delivery of radiation to patients. This daily quality assurance process is crucial because any variations in output can directly affect treatment efficacy, patient safety, and treatment planning.

Frequent checks, such as daily evaluations, help identify any changes or malfunctions in the equipment early on, allowing for prompt corrective action. Such regular monitoring ensures that the radiation dose delivered to the patient meets the prescribed levels, ultimately enhancing treatment safety and effectiveness. Compliance with these daily checks is often guided by protocols established by regional or national standards in radiation therapy.