Image Quality Assurance; X-Ray Dose / Exposure Time Settings; X-Ray Sharpness / Contrast - KaVo Dental GXS-700 Manuel D'utilisateur

Image Quality Assurance

Image quality of the GXS-700 sensor depends on several factors:
the quality of the X-ray source (kV, focal spot size, distance)
•
the alignment of the X-ray source to the anatomic region
•
the applied X-ray dose / exposure time
•
the settings of the computer monitor
•
It is recommended that you establish a procedure for periodic review of the image
quality. If image quality is not satisfactory, or degrading, please check the
contributing system parts as outlined below:

X-ray Dose / Exposure Time Settings

The GXS-700 sensor has been designed to be used with a wide range of dose
settings between 20 uGy and 2,000 uGy, to allow adjustments of the dose to the
specific diagnostic task, and to compensate for under- and over-exposure. As
a general recommendation, start by using dose / exposure time settings
recommended by your X-ray source manufacturer for digital X-ray sensors.
The GXS-700 sensor can be used with much lower dose / exposure time
settings. Nevertheless, low dose operation of a digital sensor in general can
result in a grainy image appearance. If the image of the GXS-700 sensor
appears grainy, increase the dose settings. If you obtain good results with a
particular setting, you might try a lower dose setting to see if you still gain good
results.
The GXS-700 sensor can work at higher dose /exposure time settings, if
needed for a particular diagnostic task. At high dose / exposure time settings, it
might not be possible to distinguish air from soft tissue. Such regions may
appear overexposed. If air and soft tissue regions in the image appear
overexposed, reduce the dose settings.
Remember, as with standard film, you will need to adjust the duration setting to
compensate for tooth type (central incisor to molar) and patient body type
(larger adult to small child). Ultimately, the settings you choose should be what
you consider to be suitable for your diagnostic needs.

X-ray Sharpness / Contrast

Many parts of the X-ray imaging system contribute to the sharpness and
contrast of the image. It is recommended that you use a dental phantom for a
periodic (at least annual) assessment of the image quality by performing a side-
by-side comparison of an initial dental phantom image to a current dental
phantom image to ensure that the images have sufficient quality for diagnostic
purposes in your application.
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