focal trough


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Related to focal trough: panoramic radiography

focal trough

A three-dimensional area within which structures are accurately reproduced on a panoramic radiograph. Positioning the patient within the focal trough is critical to producing a panoramic radiograph that clearly reproduces oral structures.
See also: trough
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Only the anterior dentition and its corresponding tissues will be distorted; the rest of the anatomy is typically within the focal trough and appears with no abnormal distortion on the image.