Operator control panel

Figure 1-50.—Operator control panel. discussed (e.g., incorrect horizontal angulation produces superimposed radiographic images, and incorrect vertical angulation produces images that may be foreshortened or elongated.) The following are additional causes of faulty radiographs: No image (fig. 1-51): The film was immersed in the fixer before the developer. If the film is completely clear, it was never exposed. Very light image (fig. 1-52): The film was underexposed (kilovoltage too low); the developer was Figure 1-51.—No image. Figure 1-53.—Partial image (cone cutting). Figure 1-52.—Very light image. weak; or the film was not left in the developer long enough. Very dark image: The film was over-exposed (kilovoltage too high); the developer was too warm; or the film was left in the developer too long. Partial image (fig. 1-53): The film was not completely immersed in the developer; the film came into contact with other film or the side of the tank while in the developer; or the film or tube head was incorrectly positioned (cone cutting). Blurred image: The patient or tube head moved during the exposure. Fogged film: The film was outdated or contaminated; the film was overexposed by being held too close to the safelight; the film was exposed to stray radiation, excessive heat, chemical fumes, or lightleaks in the darkroom; the developer was improperly mixed, contaminated, or too hot. Streaked or stained film: The film was insufficiently washed or fixed; the processing solutions were dirty; or the film hanger was dirty. 1-35