4-33. EVALUATION AND INTERPRETATION
a. Measure the density of all the test films at the reference marker.
b. Record the density readings on the form.
c. Calculate the average exposure time for each field test.
d. Record the calculations on the appropriate section of the form.
e. Compare the results on individual field measurements. They should be within
ten percent of the average measurements.
4-34. DENSITY CONTROL FUNCTION TEST
a. Maintain the same geometry and set up as in the reproducibility test (see
b. Select the sensing fields that you used in the reproducibility test.
c. Insert a cassette into the Bucky tray and close the Bucky tray.
d. Place a lead number on the phantom for identification.
e. Select a density control station (plus or minus one or plus or minus two) (see
f. Record the appropriate data on the proper section of the form.
g. Make the exposure (see figure 4-28).
h. Repeat steps a through g until all the density control stations have been
Process the films.