Application of Image Plate in Quality Assurance of Medical Accelerator

Objective To explore the value of Computed Radiography(CR) in quality control for the medical linear accelerator. Methods By using both CR and autoradiography film respectively, we tested the alignment of light fields with radiation fields, collimator rotation with center, couch rotation with center and multi-leave collimators(MLC) position accuracy of medical linear accelerator. Each tests were carried out ten times repetitive collection. Then compared the differences between this two methods. Results There were no significant difference between CR and autoradiography film in the same grup(P>0.05). Conclusion CR can be used in quality control for the medical linear accelerator since it can meet quality control requirements of radiotherapy.