6-6.
CORRECTIVE MAINTENANCE
a. Perform a retest if the first test indicates that the cut level is out of the
established limits.
b. Call a service representative or engineer if the retest confirms the problem.
Section II. EXPOSURE ANGLE TEST
6-7.
PURPOSE
The exposure angle test determines the exposure angle during a tomographic
exposure compared with the indicated exposure angle.
6-8.
EQUIPMENT/MATERIAL
a. Forty-five degree tomographic wedge with a centimeter angle test tool.
b. Three-fourth-inch Plexiglas attenuator blocks.
c. Data forms.
6-9.
PROCEDURE
a. Prepare equipment to be tested.
b. Select the most commonly used tomographic motion, exposure angle, and
sweep speed.
c. Place the x-ray tube at a perpendicular angle to the table.
d. Use the equipment centering light.
(1)
Position the tomographic test wedge in the center of the field.
(2)
Align the 12.5 cm scale marker to coincide with the central ray.
NOTE:
For linear systems, orient the wedge so the scale is perpendicular to
the direction of the tube motion.
e. Place the Plexiglas attenuator blocks on the sides of the wedge.
f. Place a 10- x 12-inch cassette in the Bucky tray with the long axis
perpendicular to the long axis of the tabletop. (The 10- x 12-inch cassette will be
crosswise in the Bucky tray.
MD0062
6-5
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