GE Advantium CT9800, Технические публикации

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GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 12
Direction 18000
6-9-15
➤ 6. Be sure that no X-Ray exposures have been made for at least 5 minutes. The remainder of this procedure
must be done with a cold tube.
Enter CTDS
•
(DC) Data Collection
•
(3) X-Ray Tube Position
•
(180) 180 Degree Tube Position
•
(CR)(CR) To Down Load Position and return to Data Collection
•
(4) Stationary X-Ray ON
•
(3) Real Time Statistics
•
(D) Default Rotor Speed
•
(20) 20 mA
•
(120) 120 KV
•
(10) 10 mm Aperture
•
(A) Air Filter
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(500) X-Ray ON position
•
(2500) X-Ray OFF position
•
(500) Trigger ON position
•
(2000) Number of triggers (2 second scan)
•
(1000) Trigger Frequency
•
(2) Offset Correct & Normalize
•
(CR)(CR)(CR) Default filename & run discription. Enter to continue.
7. After the scan is completed, remove and develop the films. Be sure to mark them to remember their relative
positions.
Refer to Illustration 6-9-12. Make another line on the exposed films exactly 1.00 inch (25.4mm) from the first
line, toward the gantry.
8. The center of the X-Ray beam must be toward the gantry on the detector window. The X-Ray beam center
(CL EXPOSURE) must be within 0.020’ to 0.040’ (0.5mm to 1.0mm) of the Detector Window Center but is
placed toward the Gantry, as shown in Illustration 6-9-12.
The difference between these centerlines is measured using a Vernier caliper or pocket comparator with mm
or inch scale reticle. Measure the two edges between the exposure and the window. If these dimensions are
XF(front) and XR(rear) the centerline difference is :
XF - XR
2
To meet specification and maintain that a shift toward the table is positive;
XF - XR = 0.06 + 0.02 inches; or XF - XR = 1.50 + 0.5 mm
9. If adjustment is necessary, refer to Section 9-2 of this chapter. Always move the detector so that it remains
parallel to the Gantry.
Turning the adjusting nut 5.5 flats clockwise moves the detector 0.04” (1mm) towards the table. Retighten all
the cap screws and lock nuts before continuing.