Final Exam Theory Only

Question 1

What is the CR for a PA projection of the mandibular rami?

Answer 1

perpendicular exiting the acanthion

Question 2

What planes of the patient’s head should be perpendicular to the bucky for a PA mandibular rami projection?

Answer 2

OML and MSP

Question 3

What is the CR for a PA Axial projection of the mandible?

Answer 3

20-25 degrees cephalad, exiting the acanthion.

Question 4

How would you position the patient for an axiolateral oblique projection of the mandible, if the the body of the mandible was of primary interest?

Answer 4

rotate head 30 degrees towards IR

Question 5

What is the CR for an axiolateral oblique projection of the mandible?

Answer 5

25 cephalad passing through region of interest

Question 6

What structure is shown on an axiolateral oblique projection of the mandible?

Answer 6

The structure that is positioned parallel to the IR

Question 7

What is the patient position for a submentovertical (SMV) projection of the zygomatic arches?

Answer 7

AP with MSP perpendicular and IOML as close to parallel with the IR.

Question 8

What is the CR for a SMV projection?

Answer 8

Perpendicular to the IOML and entering the throat midsagitally approximately 1 inch posterior to the outer canthus

Question 9

What is the CR for the modified townes projection?

Answer 9

30 degrees caudad entering the glabella if OML perpendicular. If IOML use 37 degrees.