QTPS1	For workstations: On rebooting the system, onscreen messages must be checked for indications of possible system malfunction (see more information in International Atomic Energy Agency [IAEA] Technical Reports Series No. 430 section 10.2.19). The system should be checked if error message is displayed during the rebooting process. Document the error message and fix. For a multiple‐user TPS running on a server(s), rebooting may not be recommended. However, server log files shall be reviewed and error messages investigated and fixed as required. After a software or hardware upgrade of the workstations or server(s) associated with the TPS, a quarterly quality control shall be performed. Revalidation is required for a major upgrade (e.g., involving a new operating system or a new user‐server(s) communication platform)
QTPS2	Using the onscreen ruler, check that a known contour has been digitized accurately (see more information in IAEA Technical Reports Series No. 430 section 10.2.29)
QTPS3	Using a standard set of at least three clinical plans covering a range of treatment configurations (photons and electrons), confirm that the data are accurately transferred from the TPS to the therapy machine (see more information in IAEA Technical Reports Series No. 430 section 10.2.119)
QTPS4	Using a standard set of at least three clinical plans covering a range of treatment configurations, confirm that the data are accurately transferred from the TPS to hard copy, or digital copy for paperless environments (see more information in IAEA Technical Reports Series No. 430 section 10.2.109)
QTPS5	Check the dimensions on the printout against the inputted contour and previous plots. The tolerance of 2 mm and action level of 3 mm do not apply to instances where the printout is used for patient/beam setup verification (i.e., stereotactic radiosurgery where significantly more stringent criteria are required) (see more information in IAEA Technical Reports Series No. 430 section 10.2.39)
QTPS6	Check the integrity of data restored from recently backed up files (see more information in IAEA Technical Reports Series No. 430 section 10.2.49). If this test requires a parallel TPS to be safely conducted and such parallel system is not available, a set of patient files from the clinical TPS shall be compared to the corresponding backup patient files
QTPS7	Check that the CT geometry and the relationship between CT number and density have not changed. Tolerances and action levels are specified in millimeters/relative electron density. Under some circumstances, for example, volumes in close proximity to the optic nerve, tighter performance criteria may be necessary (see more information in IAEA Technical Reports Series No. 430 section 10.2.69)