Section IV. CUT THICKNESS TEST
6-19. PURPOSE
The cut thickness test determines the thickness of the tomographic cut.
6-20. EQUIPMENT/MATERIAL
a. A 45 degree tomographic wedge with a centimeter scale.
b. Plexiglas attenuator blocks 3/4-inch thick.
c. Recording data form.
d. A 10- x 12-inch cassette.
6-21. PROCEDURE
a. Prepare the system to be tested.
b. Insert the 10- x 12-inch cassette into the Bucky tray.
c. Place the x-ray tube in a position perpendicular to the tabletop.
d. Use the system's centering light to:
(1)
Position the tomographic test tool.
(2)
Align the 12.5 cm mark on the scale to be coincident with the central ray.
NOTE:
For linear systems, the test tool should be oriented so that the scale is parallel
to the direction of the tube travel (see figure 6-8).
e. Select the most commonly used:
(1)
Tomographic motion.
(2)
Sweep speed.
(3)
Exposure angle.
f. Select a cut level of 12.5 cm.
g. Record the information on the data form.
MD0062
6-14