Application of repeat image analysis to radiation therapy imaging modalities as a quality improvement tool for image guided radiotherapy.

Background: Repeat images contribute to excess patient dose and workflow inefficiencies and can be analyzed to identify potential areas for improvement within a program. Although routinely used in diagnostic imaging, repeat image analysis is not widely used in radiation therapy imaging, despite the role of imaging in the delivery of precise radiation treatments.

Purpose: Repeat image analysis was performed for on-board cone beam CT imagers and CT simulators within a radiation therapy department.