What is a Portal Film?
X-Ray films are periodically taken during the course of radiation therapy treatments. The therapist will be taking verification x-rays or portal films once a week as part of our quality assurance program. These films are necessary to check treatment alignment. The films simply verify that the markings that have been placed on you or on your immobilatization device, used during your treatment have not shifted from their original placement. It is critical that your treatment positions are reproduced on a daily basis in order to have the best results. The films do not give us information about tumor response during radiation therapy.
