The usefulness of TV techniques fur transmission of chest radiographs has been investigated. Diagnostic accuracy has been evaluated by means of a test series of radiographs containing normal and abnormal films. This series was presented to a number of observers in various display modes and their responses scored. Transmission via microwave links over a 3-mile distance was evaluated by comparing observer performances with those obtained via closed circuit television and direct viewbox viewing. Our findings show that with suitable electronic processing closed circuit television yields error rates comparable with direct viewing but that the microwave link used yields a degraded performance even with processing. This indicates that remote viewing without loss of diagnostic accuracy is feasible using closed circuit television but further electronic processing methods need yet to be developed to bring microwave transmission up to par. A technique for the remote selection of multiple views has also been developed to enable film reading with the use of a single monitor. Television techniques may thus yield methods for the remote display of radiographs both for diagnostic and consultative purposes.
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