31: Radiographic Faults

Radiographic Faults

A radiograph is considered ideal when it is dimensionally accurate, covers the area of interest completely and has optimum density and contrast. When the above criteria are not met the radiograph is termed faulty. A faulty radiograph is non-diagnostic and necessitates retaking the radiograph which leads to unnecessary patient exposure.

Errors in Film Storage and Handling

These can occur prior to the radiographic exposure and after the processing especially before the film is completely dry.

Film Fog

The overall appearance of the radiograph is dark. The radiographic image will show decreased image contrast and detail and as some authors believe they appear as though the radiographs are being viewed through a fog thereby obscuring the image (Figure 1).

Emulsion Peel and Scratched Film

Emulsion is coated onto the plastic supportive base of the film and it adheres to the base via a coat of adhesive agent. However, during the developing process, the emulsion is rendered soft to aid in the rapid diffusion of the developing agents into the emulsion and reacts with the silver halide grains. However, the hardeners in the fixing solution shrink and harden the gelatin to prevent its damage. White lines appear when the soft film emulsion is removed from the film base by sharp objects.

Jan 12, 2015 | Posted by in Oral and Maxillofacial Radiology | Comments Off on 31: Radiographic Faults
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