Five fast screen-film combinations were tested and compared with a conventional high-definition system. A phantom head was radiographed using different tube voltages. One linear distance and four angles were measured on films with the same density. All the combinations were subjectively judged to be qualitatively inferior to the reference system. The loss in definition had little influence on the reliability of the cephalometric measurements as estimated from duplicate readings on identical films. The exposure required to obtain adequate film density was low, especially for the systems based on salts of rare earth metals.
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