Essay On Panoramic Radiographs

963 Words4 Pages
POSITIONING ERRORS IN ORTHOPANTOMOGRAPHS [OPG]
TAKEN FOR ORTHODONTIC ASSESSMENT
-A RETROSPECTIVE STUDY
Introduction
An ideal radiograph is the one which has high diagnostic quality. To obtain diagnostically useful panoramic radiographs, it is necessary to properly prepare and position the patients in the focal trough [1]. The value of a radiograph is reduced when it is of poor diagnostic quality. Improper positioning leads to an image of low diagnostic value. Such non diagnostic image requires repetition leading to increased risk of radiation induced cancer which has been estimated as 0.21 or 1.9 per million examinations [1].
Panoramic imaging ( orthopantomography) is an imaging technique that is employed for producing facial structures including both maxillary and mandibular dental arches and their supporting structures in a single image. In
…show more content…
In panoramic imaging , an X ray source and an image receptor rotates opposite to each other around the patients head creating a focal trough. The objects that lie within the focal trough are displayed clearly while the objects in front or behind the focal trough are blurred. Thus the panaromic machine creates a focal trough through the dentition and adjacent structures.
Paatero and Numata were the first to describe the principles of panaromic radiography. An X ray source and an image receptor rotate around the patients head and create a curved focal trough. The objects that lie within the focal trough are displayed clearly while the objects in front or behind the focal trough are

More about Essay On Panoramic Radiographs

Open Document