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A comparison of 17 radiological examinations of the lacrimal pathways performed on twelve patients using digital subtraction and conventional film technique showed that digital subtraction dacryocystography yields images of superior quality. Digital subtraction makes enhanced imaging of the opacified tear duct as well as elimination of super-imposing skeletal structures possible, which with conventional techniques frequently impair diagnostic accuracy. In measurements of the radiation dose sustained by the crystalline lens, the radiation level with digital subtraction was found to be considerably lower than with the conventional method.
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