Varex Imaging 2315NDT, Руководство пользователя

Страница: 32 / 60

USER
MANUAL
18 www.vareximaging.com
2315NDT v2 CMOS X-ray Detector User Manual
4
An image similar to Figure 3 should be visible. Position an X-ray opaque object (such as a
metallic pen or phantom test piece) diagonally on the detector surface, near the center.
Figure 3 Dark Image
5
Set the generator to 50 kV, 32 mA (with an SID of 60 cm).
6
Use the Configuration menu to set the detector exposure window to 50 ms .
7
With the X-ray beam on, capture a single image by clicking Snap .
8
An uncorrected image, similar to Figure 4 , should be visible.
Figure 4 Raw X-ray Image
9
The image may appear too dark or too bright. Move the cursor over the displayed image, and
note the pixel value that is displayed to the right of the image.
•
If it is above 16,000, the image is overexposed, and the X-ray mA should be reduced.
•
If it is below 2,000, the image is underexposed, and the tube mA should be increased. If
the mA cannot be increased, the exposure window can be increased instead.
10
When you have determined the right combination of mA and exposure time, which gives an
open-field pixel value of around 12,000 – 14,000, note this combination. You will need it for
the next procedure.