Panoramic Anatomy

Question 1

What is the focal trough?

Answer 1

Structures within the focal trough will appear clear on image.
Structures outwith will appear faint and spread out.

Thinner in incisor region- why anteriors are often blurry on image

Question 2

How do structures bucal to the focal trough appear?

Answer 2

Smaller and narrower

Question 3

What is the result of patient being too far back in machine?

Answer 3

Incisors now lingual to focal trough - appear larger and wider

Question 4

What is the result of pt chin pointing down?

Answer 4

“Smiling” occlusal plane

Question 5

What is the result of pt chin up?

Answer 5

Flat occlusal plane

Question 6

What causes distortion of one side?

Answer 6

Mid sagital plane not centred

Question 7

What is the result of patient being slumped?

Answer 7

Excessive cervical spine shadow

Question 8

What is the result of the patient being too far forward in the machine?

Answer 8

Incisors now bucal to focal trough - appear smaller and narrower

Question 9

What are features of a ghost image?

Answer 9

Eg earring

Appears more superior on contra lateral side of image
Horizontally magnified