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Glossary 106
4 Glossary
Q/A check
In softcopy diagnostic systems, displays are used to judge medical
images and to take conclusions about patients’ physical condition.
It is obvious that the image quality is of the utmost importance.
Therefore it is necessary to check the quality of the system, and
especially the displays’ image quality, on a regular basis.
A Q/A check tests the image quality of all the displays on a medical
viewing station. It consists of a number of Q/A tasks.
Some Q/A tasks have target values and tolerances that can be set
to generate a warning or an error. For other tasks, the user must
judge if the result is OK or not.
When an error occurs, measures must be taken immediately to
restore the image quality.
In the intervention-free concept of MediCal, tasks can be
scheduled to start automatically, running in background. Some of
the tasks do not require any user interaction at all. The tasks are
executed and the results are immediately sent to MediCal
Administrator, if installed.
Conformance (conformity)
When the system is installed, a Preset is defined for each display
in the viewing station. This Preset is the reference for the display’s
visual behavior. When the display image quality is good, the
display is conform to the defined Preset.
Consistency
Due to aging and other external conditions, the display image
quality is not constant. If the change in image quality is still within
the tolerances defined in the task properties, the display is still
consistent.
Calibration
In many cases, calibration is the remedy for a display that is no
longer conform to its Preset.
The calibration routine restores the black luminance, the white
luminance and the display function.