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Today, modern CT systems are equipped with routine quality control tests which are performed daily following x-ray tube warmup and calibration of detectors as well as monthly or at pre-set time intervals according to manufacturers’ specifications. Nevertheless, it is vital that radiographers/radiological technologists performing such quality control testing procedures are acquainted with the aim, the technical aspects of measurements, the level of acceptance and the impact on image quality for each quality control test.
The standard image quality tests included in the following table and the frequency of testing is indicative and may not be based on CT relative performance but vary depending on manufacturers’ quantitative acceptance criteria and national requirements. Hence the following table should serve as a guidance chart on CT quality control