The advantages of direct systems over the phosphor-imaging systems are that a direct image takes just a few seconds to be generated. There is no intervening step between exposure and reading the image. The sensor can be left in place while waiting for the results. As the size of the imaging plate is very similar to conventional film, there is no learning curve for plate placement. The disadvantage of these systems is that they require the extra developing step.
Studies comparing the different technologies and conventional film are ongoing.
This Update concentrates on direct systems for intraoral radiography. Image Enhancement Features Digital radiographs have some advantages over conventional radiographs. Most systems have a zoom feature to increase the size of the image. They have a measuring feature to evaluate distances. Most systems allow the image to be inverted from negative to positive and vice versa.