Performance evaluation of online imaging systems attached to medical linear accelerator

During fractionated radiotherapy, it is essential to account for inter and intra fraction movements. Quantification of such variations are done using sophisticated linacs equipped with online imaging during radiotherapy. This technology necessitates a comprehensive Quality Assurance (QA) program to maintain and monitor the system performance characteristics, which was established at the time of commissioning. The objective of this study is to perform periodic QA on imaging systems as per various protocols and to verify the functionality, accuracy, stability and image quality of the radiographic and CBCT mode