4-15. PROCEDURE
a. Place the cardboard film holder on the x-ray table.
(1)
Use two lead sheets.
(2)
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
table.
e. Set the SID at 24 inches.
f. Collimate the x-ray beam to the exposed fourth of the film holder.
NOTE:
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
being used.
h. Set the machine factors.
(1)
80 kVp.
(2)
10 mAs.
(3)
Small focal spot (see figure 4-11).
NOTE:
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.).
NOTE:
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).
MD0062
4-14