Canon CXDI-40G COMPACT Service Manual page 129

(10) Check that the "AG" value on the screen is ± 1.0 or less.
AG: Grid installation angle (deg)
+ indicator: Tilt in the clockwise direction (CW)
- indicator: Tilt in the counter-clockwise direction (CCW)
Note that when the AG value is more than ± 1.0, the grid stripe reduction process
does not function.
(11) Press the Enter key to exit the screen.
(12) Perform steps (8) to (11) on the remaining two images, and check the grid installation
angle.
(13) If any of the three images has a grid installation angle of more than ± 1.0, correct the
grid installation position, and take the images again.
(14) The procedure is complete when the grid installation angle of the three images is ± 1.0
or less.
The "audit_grid.exe" file that was copied to the CCR folder does not need to be deleted.
*Definition of Grid Installation Angle
The grid installation angle that is output is defined as the angle made from the X-ray focal point
during X-ray exposure when viewing the grid or imaging unit as shown in the figure below. The
angle is expressed as a positive value for clockwise rotation and as a negative value for
counter-clockwise rotation. The expression of this angle is not dependent on the grid stripe
direction.
X ü Å " _
X-ray focal point
2. Installation
Grid
X-ray sensor
ƒ O ƒ Š ƒ b ƒ h
X ü ƒ Z ƒ " ƒ T
+
- 109 -
ƒ O ƒ Š ƒ b ƒ h ‰ " Š p " x
Angle of Grid
(AG)
i A G)