Figure 4-28. Density control station minus two (-2) being tested.
4-35. EVALUATION AND INTERPRETATION
a. Measure each film at the reference point.
b. Record the data on the appropriate area of the form.
c. If the kVp is constant, the exposure time should increase with the increased
d. If the phantom thickness is the same, the exposure time should decrease with
the increased kVp.
Densities should be in the range of 0.4 optical density over the kVp for
phantom thickness above 4 inches.
4-36. RESPONSE CAPABILITY TEST
This test ensures that the automatic exposure control responds to different
patient thicknesses with both exposure time and an increase or decrease of kVp.
a. Maintain basic setup for reproducibility test.
b. Remove two sections of the phantom; only the base section of two inches
remains (see figure 4-29).