Scatter rejection by air gaps: An empirical model

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Abstract
Scatter rejection by air gaps was analyzed in the context of a model in which scattered radiation was treated as if it originated from an effective scatter point source (ESPS), located between the focal spot of the X-ray tube and the exit surface of the phantom or patient. Excellent agreement was found between the ESPS model and scatter measurements performed on phantoms for a variety of experimental conditions. Values for Xs (distance from phantom exit surface to effective scatter point source) were consistently in the range 15-20 cm. Applications of the model for predictions of scatter rejection by air gaps and comparisons to other scatter rejection methods are presented.

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