What is the main application of electronic portal imaging in radiation therapy?

Electronic portal imaging in radiation therapy is primarily used for evaluating setup errors. The main function of this technology is to provide real-time imaging of the patient's anatomy as it is positioned for treatment. By comparing these images against reference images or treatment plans, clinicians can identify any discrepancies in patient positioning before the radiation treatment is delivered. This capability is essential for ensuring that the radiation beams accurately target the intended area and minimize exposure to surrounding healthy tissue.

By effectively detecting and correcting setup errors, electronic portal imaging enhances the precision of radiation therapy, thereby improving treatment efficacy and reducing the risk of complications. This role in error evaluation is fundamental to the overall quality assurance process in radiation therapy. Other applications, while important, do not capture the primary function of electronic portal imaging as accurately as evaluating setup errors does.