Three Simple Rules
All positioning errors involve the three parameters of tube angulation, tube position and film position. Three simple rules serve to identify and correct any errors.
- If the image is foreshortened or elongated, adjust the tube angle. To make the roots longer, move the tube head more laterally.
- If you cut the target off at the edge of the beam (cone cut), simply move the beam over toward the area of cone cut.
- If you cut the target off at the edge of the film, move the film over toward the area you cut off.