In panoramic radiography, the ____ is a theoretical concept used to determine where the dental arches must be positioned to achieve the clearest image.

Question

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The focal trough, also known as the image layer or image plane, is a 3-dimensional curved zone where the dental arches should be positioned in order to produce the sharpest image on a panoramic radiograph. It is determined by the shape and size of the x-ray machine's collimator, and is a theoretical concept rather than a physical structure.

In Panoramic Radiography, the ____ Is a Theoretical Concept Used