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Radiology, Vol 139, 234-235, Copyright © 1981 by Radiological Society of North America

ARTICLES

Grid selection for oral cholecystography

RE Miller and MJ Besozzi

A radiographic and fluoroscopic unit was modified to image without a grid, with one 6:1 grid, and with two crossed 6:1 grids, placed with the strips at right angles (equivalent to a 12:1 grid). Fifty patients were studied in all three modes in both horizontal and upright positions. The crossed 6:1 grids were superior in 80% of cases. In those cases where no grid or one grid was superior, there was a shorter exposure time or no movement by the patient. High-ratio grids should be used for routine cholecystography combined with shorter exposure times for the initial procedure.




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