GE Healthcare eXplore Locus SP, Руководство по обслуживанию

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GE H
EALTHCARE
D
IRECTION
5158821-100, R
EVISION
3
E
X
PLORE
L
OCUS
SP S
ERVICE
G
UIDE
Page 180
c. Manually
adjust the
stage using the
stage’s
adjustment
wheel (see
Note below).
This moves the
stage
perpendicular
to the rail as
shown here in
the diagram.
d. Continue to
determine the
value of the
ball’s
geometric
centre at both the detector end and the X-Ray Source end - manually adjusting the stage’s
adjustment wheel in between - until the values are equal, plus or minus 1 pixel.
Note: The adjustment will change the ball’s geometric centre value 3 times faster when the stage is
at the X-Ray Source end compared to an adjustment when the stage is at the detector end.
If the value at the X-Ray Source is larger than the value at the detector end, turning the
adjustment wheel clockwise reduces the values. Small movements of the adjustment wheel
are required. One pixel will equal a few (1 to 5 degrees) turn of the wheel.
Once confirmed (i.e. the values of the 2 geometric centres are the same + or - 1 pixel):
15. Carefully tighten the 4 bolts (snug only) once the values are close. Make the bolts sufficiently
tight so that the adjustment wheel will operate but is difficult to turn. Tightening the bolts may
change the value of the geometric centres.
16. Complete the tightening of the 4 bolts and then verify the results at both ends. The bolts may
need to be loosened and retightened as you use the adjustment wheel to align the 2 values.
Once the 2 figures are again within 1 pixel of each other, the geometric centre of the ball (the value
of its x axis) is now the CENTRE OF ROTATION. Make note of this value in the Worksheet.
17. Save a captured image at both the detector end and the X-Ray Source end. Name the image
closest to the detector smallball.vff and the image closest to the X-Ray Source largeball.vff .