Abstract
Grids can significantly increase the contrast of diagnostic radiologic images, but they increase the dose to the patient and staff by a factor of 2 or more. Image quality with and without grids for fluoroscopic and photofluoro spot imaging of lower gastrointestinal studies has been examined. Dose reductions of 1/3-1/2 can be obtained with little or no degradation in contrast and diagnostic image quality if grids are not used for gastrointestinal examinations involving image intensifiers.

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