... Quality control for the dental field ...

Introduction Not only in mammography or conventional radiology it is essential to maintain a constant quality. This is also the case in dental radiology. Therefore we have developed a unique phantom, based on our contrast-detail phantoms: the Artinis CDDENT 1.0 phantom. In this phantom objects with very small contrast and diameter are used. By using this phantom quality can be maintained through the years, and radiation dose- image quality can be optimized.

Construction The phantom consists of an aluminum base with various cylindrical objects of different depth and diameter. The aluminum base is covered with Plexiglas (PMMA). Under normal dental-radiation conditions the aluminum base and PMMA cover have an equivalent of an average tooth. The thickness of the phantom is 3.0 mm, the overall size is 40 by 30 mm. The effective area is 25 by 16 mm, which makes the phantom suitable for almost every image sensor on the market.

The objects differ in depth from 0.04 mm to 0.70 mm, in 10 exponential steps. The diameter of the objects also varies in 10 exponential steps from 0.10 mm to 1.00 mm.

The phantom is prepared for to be used in conjunction with an automatic analyser program.

Evaluation  After having made an x-ray image the phantom is evaluated by indicating which objects are visible. The line connecting the spots with the smallest visible diameter and depth (or contrast) is the contrast-detail curve. This is explained in more detail on the pages of for example the CDRAD phantom.

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