Abstract
In this study, the principles of Peircean semiotics are used to elucidate the interpretive process for Roentgen signs. We begin with the identification of terminological, propositional, and argumental interpretants in the context of Roentgen diagnosis. We examine the contributions of collateral knowledge and principles of inference, both associational and logical, to the formation of diagnostic interpretants. The Peircean modes of logical inference are then adapted to represent their use in clinical practice by a solitary interpreter. It is suggested that this semiotic model of Roentgen diagnosis may also apply to the interpretation of visual signs in other diagnostic domains.
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