ABSTRACT
Positioning for postero-anterior mandible projection. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315382210/8ca82e7c-bd07-4171-b4f5-ebaded57b5b3/content/fig2_55a.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>
The patient sits erect facing the vertical Bucky/receptor (in the case of trauma, the projection may be taken anteroposteriorly).
The patient’s median sagittal plane should be coincident with the midline of the Bucky/receptor, and the patient’s head is then adjusted to bring the orbito-meatal baseline perpendicular to the Bucky/receptor.
The median sagittal plane should be perpendicular to the receptor. Check the external auditory meatuses are equidistant from the Bucky/receptor.
An 18 cm × 24 cm CR cassette, if used, should be positioned such that, when placed longitudinally in the Bucky, it is centred at the level of the angles of the mandible.
