6-23. PREVENTIVE MAINTENANCE
The cut thickness test should be performed:
a. At six-month intervals.
b. After any service work on the tomographic drive mechanism.
c. When you need to know the thickness of the tomographic cut.
6-24. CORRECTIVE MAINTENANCE
a. Call the equipment manufacturer.
b. Discuss questions about the thickness of the cut plane with the equipment
manufacturer.
Section V. FLATNESS OF PLANE
6-25. PURPOSE
This test determines the flatness of the tomographic plane.
6-26. EQUIPMENT/MATERIAL
a. One 45 degree tomographic wedge with a centimeter scale.
b. Plexiglas attenuator blocks, 3/4 inch.
c. One 14- x 17-inch cassette.
d. Recording data forms.
6-27. PROCEDURE
a. Prepare the equipment to be tested.
b. Place the 14- x 17-inch cassette lengthwise in the Bucky tray (see figure 6-
10).
c. Place the x-ray beam perpendicular to the tabletop and adjust the
beam restriction system to provide a 14- x 17-inch radiation field (see figure 6-11).
d. Position the 45 degree test wedge in the center (approximately) of the upper
left quadrant of the light field with 12 cm point of scale (see figure 6-12.
MD0062
6-17