What radiographic device reduces scattered radiation in the patient and improves image quality but increases patient dose?

• A. Grid
• B. Collimator
• C. Filtration
• D. Cassette

Answer: (A)

The device described is a grid. Its job is to reject scattered photons before they reach the image receptor, which improves image contrast and overall image quality. However, because the grid absorbs some of the primary beam as well, you have to increase the exposure to maintain receptor density, which means the patient receives a higher dose.

Collimators limit the exposed area, reducing scatter production and patient dose, but they don’t selectively remove scatter to the same extent as a grid. Filtration lowers patient dose by removing low-energy photons and improving beam quality, but it doesn’t increase dose. The cassette is just the receptor and doesn’t affect scatter or dose.