AP axial cervical

Question 1

How is the chin positioned in this image?

Answer 1

Raised up until occlusial plane is lined up with the base of skull, perpendicular to IR

Question 2

What is the central ray angle and direction?

Answer 2

15-20 degrees cephalic

Question 3

Why is this central ray angle used?

Answer 3

The cervical bodies are slightly angled and we need tube angle to correct it

Question 4

If a PA axial projection is done instead, how should the central ray be adjusted?

Answer 4

15-20 caudad

Question 5

What cervical structures are best demonstrated in this image?

Answer 5

c3 without superimpostion
If the mandible is cover c3, chin is tucked too much

Question 6

How many cervical vertebrae should be demonstrated?

Answer 6

c3-t2

Question 7

How can you determine if there is rotation in this image?

Answer 7

Spinous process should run down middle. Spinous process goes in opposite direction of rotation

Question 8

If the intervertebral disk spaces are closed, what error occurred?

Answer 8

Not enough angle or no angle at all

Question 9

What is the central ray location?

Answer 9

MSP, c4