GB/T 17006.7-2003

Evaluation and routine testing in medical imaging departments--Part 2-7: Constancy tests--Equipment for intra-oral dental radiography excluding dental panoramic equipment (TEXT OF DOCUMENT IS IN CHINESE)

1.1 Scope - This part of GB/T 17006 applies to diagnostic X-ray system radiological equipment with films for intra-oral dental radiography or with electronic devices (sensors) excluding dental panoramic equipment.

This part of standard is part of special publication (standards and technical reports) series. It provides test methods for constancy of subsystems of diagnostic X-ray equipment.

This part of GB/T 17006 applies to equipment for intra-oral dental radiography without digital imaging device.

1.2 purpose - This part of standard describes through functional parameters the test methods for imaging quality of intra-oral dental X-ray equipment after their installation, calibration and modulation.

This part of standard establishes:

- functional parameters to describe the performance of X-ray equipment pertaining to intra-oral dental radiography checking;

- test methods considering whether the changes of tested functional parameters satisfy established standards to ensure the maintaining of proper imaging performance conditions so as to avoid unnecessary radiation to patients.

These methods are established on the basis of evaluation of radiography information by using proper devices.

The purpose of these methods is:

- to establish a performance benchmark level according to acceptance tests and initial constancy tests;

- to find and to verify any significant changes of functional parameters that correcting measures may need to be taken.

Because there is big difference among radioactive equipment, it is impossible to define a target value or an error value of parameters to be applied to acceptance as a performance standard. However, this part of standard provides guide to the degree of changes of single parameter measuring value where proper measures may need to be taken,.

This part of standard provides test methods for performance constancy of diagnostic X-ray equipment as stated in GB/T 17006.1 (see chapter 2).

This part of standard does not pertain to:

- mechanical and electrical safety;

- testing for validity of direct protection methods against X-ray radiation;

- optimizing of imaging performance.

Generally, densitometers are recommended in measuring image density. However, to make it predigested, this part of standard only uses simple devices with reference of initial constancy test films to visualized compare symmetrical constancy test films, which is deemed to be enough.

On the measurement aspect, methods described in relevant publications can be used as reference. But for practical uses, application to methods described in special publications should be applied priorly (see chapter 2).