Methods of Assessing Serial Films of the Pneumoconioses: a Review

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Abstract
This is a review of all known studies of methods of reading serial postero-anterior chest X-rays to obtain measures of change from one film to the next. Only those trials reported since 1965 are relevant: in 7 of them (involving some 17 readers and a total of nearly 4000 films) reading side-by-side in known chronological sequence was compared with independent randomized reading. In side-by-side reading, disguise of temporal order has been attempted, and various methods of assessing change have been tried. Other relevant information is discussed. On the evidence from British and Canadian sources, side-by-side reading is the method of choice, although how to record change will depend on the objective. The American evidence indicates little difference between methods, but side-by-side reading is still preferred if only because of its relative simplicity.

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