A major function of filtration in radiography is to

A major function of filtration in radiography is to

• A. Reduce patient dose
• B. Increase image noise
• C. Increase exposure latitude
• D. Increase grid efficiency

Answer: (A)

Filtration works by removing the softer, low-energy photons from the x-ray beam. These low-energy photons would deposit most of their energy in superficial tissues, increasing patient skin dose without significantly contributing to image formation. By absorbing them, the beam becomes “harder” (higher average energy), which lowers the dose to the patient and maintains or even improves image quality because the photons that reach the detector are more penetrating and useful for imaging. Filtration doesn’t purposefully raise image noise, nor does it increase exposure latitude or grid efficiency—those are not its primary effects and are handled by other aspects of technique and equipment.

Filtration works by removing the softer, low-energy photons from the x-ray beam. These low-energy photons would deposit most of their energy in superficial tissues, increasing patient skin dose without significantly contributing to image formation. By absorbing them, the beam becomes “harder” (higher average energy), which lowers the dose to the patient and maintains or even improves image quality because the photons that reach the detector are more penetrating and useful for imaging. Filtration doesn’t purposefully raise image noise, nor does it increase exposure latitude or grid efficiency—those are not its primary effects and are handled by other aspects of technique and equipment.