b. Select the most commonly used tomographic motion, exposure angle, and
c. Place the x-ray tube perpendicular to the table.
d. Position the tomographic test wedge in the center of the field.
You want a 15-centimeter (cm) scale aligned with the central ray.
For even density, position the Plexiglas attenuators on both sides of the
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.