For scatter reduction and image quality, grids are recommended when body part thickness exceeds how many centimeters?

For scatter reduction and image quality, grids are recommended when body part thickness exceeds how many centimeters?

• A. 5 cm
• B. 2 cm
• C. 10 cm
• D. 15 cm

Answer: (C)

Scatter increases with body part thickness, and when scatter rises, image contrast drops. A grid helps by absorbing scattered photons before they reach the detector, which preserves or enhances the image contrast and quality. The practical guideline is that grids are recommended when the part is about 10 cm thick or more (roughly 4 inches); thinner parts produce less scatter and may not require a grid. Keep in mind that using a grid raises the required exposure to compensate for primary photon absorption, so the decision balances scatter reduction with dose.

Scatter increases with body part thickness, and when scatter rises, image contrast drops. A grid helps by absorbing scattered photons before they reach the detector, which preserves or enhances the image contrast and quality. The practical guideline is that grids are recommended when the part is about 10 cm thick or more (roughly 4 inches); thinner parts produce less scatter and may not require a grid. Keep in mind that using a grid raises the required exposure to compensate for primary photon absorption, so the decision balances scatter reduction with dose.