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The air gap technique for chest radiography seems two violate two basic principles of good radiographic technique: First, that the body second, that the contrast decreases as the kilovoltage involves the use of fixed high kilovoltage (120 K.V.P or higher), increased object-film and focal-film distances, and variable milliampere seconds. The loss of contrast usually associated with high kilovoltage techniques is not a great problem, in heavy patients, the contrast is increased by the removal of secondary radiation, while in thin patients, the contrast changes affect the image of the ribs rather than the lungs. Although a little more efforts is needed for this method, its advantages would seem to surpass its disadvantages and justify its use, at least as a supplemental technique.
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