a. Implementation of a quality assurance program.
b. Installation of new equipment.
c. Service work has been performed on fluoroscopic beam restriction.
d. Replacement of the fluoroscopic x-ray tube.
e. Routinely at six-month intervals.
5-12. CORRECTIVE MAINTENANCE
If your test results exceed the established standards, you must do the following.
a. Verify your first test results by retesting. If the second test shows the beam
restriction accuracy to be all right, possibly you made an error in performing the first
test. If the retest results match the first test results, you may be sure that something
needs adjustment.
b. Call the manufacturer's representative or the service engineer.
Section III. FOCUSING AND RESOLUTION OF THE IMAGING SYSTEM
5-13. PURPOSE
This focusing and resolution of the imaging system test ensures that the
fluoroscopic unit has acceptable focusing and resolution (detail).
5-14. EQUIPMENT/MATERIAL
a. Image intensifier resolution test pattern.
b. Twelve-inch spacer assembly (can be plexiglas cylinder 12 inches high or
may be sponges).
c. Aluminum attenuated (attenuation is the proportion of radiation that is
absorbed by the item being measured) block that is 8 x 8 x 0.5 inches (see figure 5-7).
5-15. PROCEDURE
a. Place fluoroscopic imaging assembly at maximum height above the tabletop.
b. Place attenuated block on the tabletop.
c. Place 12-inch spacer on top of the attenuated block.
d. Place the test pattern on top of the spacer.
MD0062
5-10
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