b. Select the most commonly used tomographic motion, exposure angle, and
sweep speed.
c. Place the x-ray tube perpendicular to the table.
d. Position the tomographic test wedge in the center of the field.
(1)
You want a 15-centimeter (cm) scale aligned with the central ray.
(2)
For even density, position the Plexiglas attenuators on both sides of the
test tool.
NOTE:
For linear systems, position the test wedge so that the number scale is
perpendicular to the direction of motion.
e. Place the 10- x 12-inch cassette lengthwise in the Bucky tray and lock the
Bucky tray (see figure 6-2).
Figure 6-2. Placing the cassette in the Bucky tray.
MD0062
6-3