CPQR

Question 1

CPU/server test frequency

Answer 1

quarterly

Question 2

digitizer test

Answer 2

2 mm tolerance, 3 mm fail
quaterly

Question 3

plan transfer test frequency

Answer 3

quaterly

-to machine
-to other systems

Question 4

plotter/printer test

Answer 4

Check the dimensions on the printout against the inputted contour and previous plot
-2mm/3mm
-more stringent if being used for patient setup
-quaterly

Question 5

back-up recovery test

Answer 5

-check integrity of backed up files
-quaterly

Question 6

CT geometry/density test

Answer 6

-2mm/0.2 and 3mm/0.3
-Check that the CT geometry and the relationship between CT number and density have not changed. Tolerances and action levels are specified in millimetres/relative electron density

Question 7

annual TPS tests

Answer 7

revalidate data (check standar set of at least 4 plans)
independent quality control review

Question 8

what does revalidating data consist of?

Answer 8

-check constancy of standard set of plans
-check repeatability of DVH
-check constancy of PDD with TMR data (TPS vs measured)
-E2E test