User Manual

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Care Optoelectronics
4.5
Correction procedure
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Cautions
This procedure should
only be done by
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Cautions
If the exposure for the corrected images are collected by wrong exposure
setting, for example, (A). Over
object is put on the surface (C) collimator of Xray tube is not open to the full
field of FPD. I
t may lead to image artifact.
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Cautions
Do not expose to any X
-
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4.5
.1 Collect images
When the program is executed, the corrected images are collected in
sequence. First, 16 dark images were collected, then the X
to 20 uGy and the X ray window and offset window were both set to 200 ms
and collected 16 times. The LSB average of the light image is obtained. It
needs to fall within the range of 15,000 to 20,000. According to the above
image, the offset map
(D) and the gain map (G) are calculated. And use the
following algorithm to correct for raw images.
-
C = corrected image
- R = raw image
- F = flat field image
-
D = dark field or dark frame
- m = image-
averaged value of (F
- G = Gain =
Care Optoelectronics
Corporaon │ X-
Ray Products
Correction procedure
_____________________________________________________________
only be done by
suitably-trained
service engineer.
_____________________________________________________________
If the exposure for the corrected images are collected by wrong exposure
setting, for example, (A). Over
-exposure than or under-
exposure (B). Foreign
object is put on the surface (C) collimator of Xray tube is not open to the full
t may lead to image artifact.
_____________________________________________________________
-
ray during dark image collection.
_____________________________________________________________
.1 Collect images
When the program is executed, the corrected images are collected in
sequence. First, 16 dark images were collected, then the X
-
ray ener
to 20 uGy and the X ray window and offset window were both set to 200 ms
and collected 16 times. The LSB average of the light image is obtained. It
needs to fall within the range of 15,000 to 20,000. According to the above
(D) and the gain map (G) are calculated. And use the
following algorithm to correct for raw images.
C = corrected image
D = dark field or dark frame
averaged value of (F
-D)
55
Ray Products
_____________________________________________________________
service engineer.
_____________________________________________________________
If the exposure for the corrected images are collected by wrong exposure
exposure (B). Foreign
object is put on the surface (C) collimator of Xray tube is not open to the full
_____________________________________________________________
_____________________________________________________________
When the program is executed, the corrected images are collected in
ray ener
gy was set
to 20 uGy and the X ray window and offset window were both set to 200 ms
and collected 16 times. The LSB average of the light image is obtained. It
needs to fall within the range of 15,000 to 20,000. According to the above
(D) and the gain map (G) are calculated. And use the