Extra-Oral Views Flashcards
Which three extra-oral images relating to the mandible are regularly seen?
posterior-anterior mandible
Lateral oblique of mandible
DPT
Which three extra-oral images relating to the maxilla and cranium are regularly seen?
Lateral cephalogram (skull)
Occipito-mental views (face)
Sailography
What does an ‘oblique’ angle mean?
Neither parallel nor at right angles to a specified or implies line: slanting
What does ‘PA’ stand for?
Postero-anterior
What does ‘AP’ stand for?
Antero-posterior
What does ‘OM’ stand for?
Occipito-mental
What are positioning landmarks?
A series of imaginary lines on the side of a patient’s face which are used to help position a patient for extra-oral radiography
Name the three main positioning landmarks
Radiographic base line
Frankfort plane
Maxillary occlusal plane
Name the three main positioning landmarks
Radiographic base line
Frankfort plane
Maxillary occlusal plane
Which positioning landmark matches the description below?
Line from outer canthus of the eye to the external auditory meatus, representing the base of the skull.
Radiographic base line
Which positioning landmark matches the description below?
Line from the ala of the nose to the tragus of the ear. This landmark is used a lot in cone beam CT.
Maxillary occlusal plane
Which positioning landmark matches the description below?
Line from the inferior orbital border to the upper border of the external acoustic meatus. Can also be known as the anthropological base line.
Frankfort plane
which positioning landmark is most often used when taking a DPT?
Frankfort plane
What are the components of equipment required for an extra-oral radiograph to be taken?
Skull unit or cephalometric unit
Image receptor
Anti-scatter grid
Lateral cephalogram unit
what does scatter of x-ray photons do to the final image?
Degrade or fog the image
What is an anti-scatter grid?
A grid made up of narrow strips of lead alternating with plastic, which limits the amount of scattered radiation reaching the detector/film
Why might a PA mandible be requested?
To look for potential fractures, cysts or malignancy causing medio-lateral displacement, expansion to bone destruction.
what extra oral radiograph is a PA mandible almost always requested alongside?
A DPT