Abstract
A practical application of impedance changes in the chest during respiration has resulted in an insturment which can control the time of x-ray exposure during chest roentgenography at any desired period of respiration. The instrument,* designed by North American Aviation Space and Information Systems Division, is a by-product of the Space program, contributing a useful medical device as applied to chest roentgenography.
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More From: The American journal of roentgenology, radium therapy, and nuclear medicine
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