Which statement about the air gap technique is true?

Which statement about the air gap technique is true?

• A. It increases scatter
• B. It reduces scatter
• C. It reduces image sharpness
• D. It increases exposure time

Answer: (B)

Air gap technique works by increasing the distance between the patient and the image receptor. This extra distance reduces the number of scattered photons that can reach the detector, so image contrast improves because scatter contributes to fog on the image. That direct effect—reducing scatter—is the reason this statement is true. The approach does not increase scatter, and exposure time isn’t the primary outcome of using an air gap. Keep in mind there are trade-offs: increasing the distance causes magnification and can reduce sharpness, so the technique isn’t universally used in every situation.

Air gap technique works by increasing the distance between the patient and the image receptor. This extra distance reduces the number of scattered photons that can reach the detector, so image contrast improves because scatter contributes to fog on the image. That direct effect—reducing scatter—is the reason this statement is true. The approach does not increase scatter, and exposure time isn’t the primary outcome of using an air gap. Keep in mind there are trade-offs: increasing the distance causes magnification and can reduce sharpness, so the technique isn’t universally used in every situation.