a. Place the cardboard film holder on the x-ray table.
Use two lead sheets.
Expose one-fourth of the film holder.
b. Place the test tool on the exposed portion of the film holder.
c. Place the "bar" patterns facing the x-ray tube.
d. Align the printing on the test tool parallel to the cathode-anode axis of the
e. Set the SID at 24 inches.
f. Collimate the x-ray beam to the exposed fourth of the film holder.
Four exposures will be made on the film: two of a small focal spot and two of
a large focal spot.
g. Use the lead markers to designate whether small or large focal spots are
h. Set the machine factors.
Small focal spot (see figure 4-11).
Select a mA station with a small focal spot that is commonly used.
i. Make the exposure.
j. Repeat the above procedure using another small focal spot (see figure 4-12.).
Make sure that a different mA station is used; then, a different small focal spot
will be used.
k. Repeat the procedure using two different large focal spots (see figure 4-13).