Sinuses Review

Question 1

What is different about sinus projections?

Answer 1

Always use a perpendicular horizontal beam, and have patient be upright to see air-fluid levels

Question 2

patient position for caldwell sinuses:

Answer 2

• PA upright
• adjust chin so OML forms 15 degree angle to Horizontal CR
• MSP aligned

Question 3

IR for caldwell sinus:

Answer 3

medium LW

Question 4

CR for caldwell sinus:

Answer 4

NO ANGLE, perpendicular exiting the nasion

Question 5

Collimation for caldwell sinus:

Answer 5

Lateral margins of skull crosswise, frontal sinus to upper incisors

Question 6

good OML positioning shows:

Answer 6

Petrous pyramids in lower 1/3rd of orbits
frontal sinuses above frontonasal suture and ethmoid air cells above petrous ridges

Question 7

Any corrections that need to made to reposition petrous ridges should be done by

Answer 7

moving the patient and NOT the angle of tube

Question 8

What changes to Waters projection when performing on sinuses?

Answer 8

• Collimation to lateral skull margins, frontal sinus to upper incisors

Question 9

How to check for rotation on tilt on sinus waters?

Answer 9

Orbits and maxillary sinuses should be symmetric on both sides`

Question 10

Patient position for open mouth waters sinuses:

Answer 10

Patient upright, in waters position with their jaw dropped (open)

Question 11

Collimation for open mouth waters:

Answer 11

Can be tighter than regular waters

Question 12

What can we see for open mouth waters?

Answer 12

Sphenoidal sinus seen through the mouth

Question 13

Collimation for Lateral sinus:

Answer 13

half of frontal bone/sinus to EAM, include all facial bones except mandible as it is not necessary