Skull Views And Radiograpic Anatomy

Question 1

Main types of skull radiograph?

Answer 1

Occipitomental

Postero-anterior mandible

Reverse Towne’s

True lateral skull - same as lateral ceph but no cephalostat

Question 2

Name and Main use of this radiograph?

Answer 2

Occipitomental

• fractures of midface
• le fort fractures
• orbital blow out
• coronoid process

Question 3

Name and main use of this radiograph?

Answer 3

Postero-anterior mandible

• Fractures of posterior third of body
• angles
• rami
• low condylar necks
• mandibular hypo/hyperplasia

Question 4

Name and main use of this radiograph?

Answer 4

Reverse Towne’s

• Fractures of mandibular condyle
• intracapsular TMJ fracture
• condylar hyper/hypoplasia

Question 5

What line is used for most skull radiographs?

Answer 5

Orbitomeatal line

• outer canthus of the eye
• centre of EAM

Question 6

What radiograph is mainly used for middle third facial fractures?

Answer 6

Occipitomental

• taken at two different angles usually
• between 10 and 40 degrees

Question 7

How is pt positioned for a PA mandible?

Answer 7

Head tilted forward to receptor so orbitomeatal line is parallel to floor

Question 8

Why is the x-ray beam projected from posterior side?

Answer 8

Reduced magnification of the face
- so less distortion of relevant structures

Reduced effective dose
- x-ray beam partly attenuated by back of skull, so less dose to radiosensitive tissues such as lens of the eye