The preferred tomographic x-ray systems are the ones that allow flexible imaging and easy patient transfer.
Facilities should consider the radiographic-tomographic table system manufacturer's reputation for long-term availability of replacement parts and service support before making a purchase.
To avoid movement during procedures, the patient table movement must allow for easy patient positioning.
To prevent vibration interference and to ensure accuracy of tomograms, electronic clutching is recommended for all linear tomographic units.
For a direct interface of the collimator on the tomographic x-ray tube with the Bucky tray, linear x-ray unit devices should have positive beam-limiting equipment.
Positive beam limitation is designed mainly for patient safety and is expensive to implement. The maximum field size depends on the size of the cassette in the Bucky tray.
Users of tomographic x-ray systems should be able to easily reach the controls at tableside.
Facilities need to assess their need for a dedicated system, since computed tomography procedures have largely replaced many tomographic procedures.
Many options are available from different manufacturers. These may include the type of x-ray generator and output kV and mA; floor, table, or wall-mounted cassette holders; ceiling-mounted x-ray tube supports; and anatomic programming options.
Only qualified personnel should perform calibration of linear x-ray units and they should comply with manufacturer specifications.

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