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 118
NOTICE
Equipment
Damage
Possible
Failure to provide a tip relief will cause the rail
assembly to bend when the bolts are tightened
.
There should be at least 0.001" clearance at the tip
end
.
If you have to shim the stage, re-check the stage
tilt mechanically using the 9" Square.
Repeat steps 5 to 13 until the values are
or - 2 pixels.
VERIFY STAGE TIP (SIDE-TO-SIDE MOVEMENT):
1. Move the ball toward the X-Ray Source ( 140mm right ).
2. Elevate and rotate the tool until the top bebe appears in the centre of the screen.
3. Use the mouse pointer window as a reference guide and rotate the bebe 180°.
The goal here is to have the bebe return to the same x axis after the 180° rotation.
4. Continue to reposition the bebe until it is close to returning to the same x axis.
It may be necessary to rotate the bebe less than 0.1 degree to get it in the exact centre. To
make movements that are finer than 0.1 degree, access the
X-Ray and Motor Controller and
adjust the Steps to Travel field (e.g. 50) which are steps in the stepper motor. Adjust the
Direction and press the Start Motor button.
The next goal is to confirm that, at the X-Ray Source end, the y values at 0 and 180 degree
rotation are within 2 pixels of each other AND within 2 pixels of the Central Slice, AND the
y axis at the Detector end is within 2 pixels of the Central Slice.
5. Once the bebe is properly positioned in the x direction, capture the image, correct and unwarp
it. Open the image in
MicroView and determine the y axis of the bebe using the Region Grow
tool in MicroView . Record it in the Worksheet. This y axis must be the same as the Central
Slice value (within 2 pixels) that was calculated earlier.
If the y axis is not the same value as the Central Slice (within 2 pixels):
6. Continue to adjust the elevation - capturing, correcting, unwarping, and viewing the images in
MicroView - until the y axis is within 2 pixels of the Central Slice value. Use the Steps to Travel
field within X-Ray and Motor Controller to make movements finer than 1mm.
tip relief
no tip relief
shims
0.001"
after 180° rotation after 180° rotation