What role do electronic portal images play during treatment?

Electronic portal images are primarily used to verify beam positioning during radiation therapy treatments. This imaging technique allows clinicians to ensure that the radiation beams are accurately aimed at the intended target area, which is crucial for maximizing the effectiveness of the treatment while minimizing exposure to surrounding healthy tissues. Through the use of electronic portal images, the treatment team can compare the actual positioning of the patient and the radiation fields against the planned treatment dimensions, making adjustments as necessary.

The accuracy of beam positioning is vital for treating cancer effectively, as even slight deviations can lead to suboptimal treatment outcomes or increased side effects. By confirming that the treatment setup aligns with the treatment plan, electronic portal images play a key role in enhancing the safety and efficacy of radiation therapy. This process is integral to patient care in dosimetry as it helps in achieving precise and accurate delivery of radiation doses.