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Negative contrast media are substances used in diagnostic imaging to enhance the visibility of internal structures by creating areas of lower radiographic density compared to surrounding tissues. Unlike positive contrast agents, which appear white or radiopaque on radiographs due to high atomic number elements like iodine or barium, negative contrast media appear darker or radiolucent because they are less dense than the surrounding tissues. Their _________ ______ _______ ____ __________ _____ ___ _____ _______ ________.
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