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Bush__The_Essential_Physics_for_Medical_Imaging - Biomedical ...

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TABLE 21-3. THE EFFECT OF INCREASING COLLIMATOR-TO-OBJECT DISTANCEON COLLIMATOR PERFORMANCE PARAMETERSCollimator Spatial resolution" Efficiency Field size MagnificationParallel hole Decreases Approximately Constant Constant (m = 1.0)constantConverging Decreases Increases Decreases Increases (m >1 atcollimator surface)Diverging Decreases Decreases Increases Decreases (m

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