Video board: Good viewing of the radiography image requires a video mode of
at least 800x600 pixels x 16 million colours, corresponding to a scale of 256 shades
of grey. This requires a S-VGA video board with at least 2 MB RAM, requiring instal-
lation and use of video software drivers supplied with the video board installed
or supplied by Microsoft ® Windows®. Selection of S-VGA 1024x728 mode is useful
for displaying multiple images simultaneously. In this case, an S-VGA video board
with at least 8 MB of video RAM memory is recommended.
Monitor: To guarantee that images are displayed correctly, use of a multisync
colour monitor with a resolution in S-VGA mode of 1024x768 pixels is highly recom-
mended. Resolution depends on the video mode selected in the video board. A 15
or 17 inch screen with a dot-pitch less than or equal to 0.28 mm is recommended.
Make sure you have adjusted the contrast and brightness correctly.
Hard disk: The choice of hard disk capacity depends on the number and size of
images to be stored. Intra-oral images vary in size from 4.7 Mb (uncompressed
TIFF images with a type 2 sensor) to 100 Kb (JPEG/JFIF with 50% compression). A
20 Gb hard disk is normally capable of satisfying the requirements of the average
user. To guarantee data security, however, it is preferable to allow for duplication
to provide back-ups of les containing diagnostic images and information.
Back up (spare copy to permit recovery of data if lost): The database of patients
and images should be copied frequently (e.g. as once a week) onto a removable
mass memory support (removable hard disk, CD-Rom, Pen-drive etc.). You may
use the back-up functions oered by Microsoft® software or directly copy les of
data and images onto a removable support.
Application Software: Some diagnostic imaging software, practice management
software or other purpose software may need dierent minimal system require-
ments. Refer to the requirements of the specic software in its User Manual.
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