Relative dose efficiencies of antiscatter grids and air gaps in pediatric radiography

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Abstract
The relative dose efficiencies (RDE) of various antiscatter grids and air gaps were determined for conditions simulating those found in pediatric radiography, using phantoms representing a newborn child, a 5‐yr‐old and a 10‐yr‐old child. Our data indicate than an air gap is best for the newborn, due to the low levels of scatter. The 8:1 fiber grid or 15.2‐cm air gap without a grid can improve dose efficiency (DE) for the 5‐yr‐old child by 20%–25% relative to the 3.3‐cm air gap and no‐grid technique, while for the 10‐yr‐old child, DE can be improved by 40% with an 8:1 fiber grid.

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