Sinus Positioning

Question 1

What’s another name for the PA sinus view?

Answer 1

Modified Caldwell method

Question 2

What another name for the modified Caldwell method?

Answer 2

PA sinus

Question 3

What structures are seen for a PA sinus view (modified caldwell)?

Answer 3

• Demonstrates the frontal sinuses and anterior ethmoidal air cells
• Symmetric petrous ridges, lying in lower 1/3 of orbits

Question 4

Where is the CR for a PA sinus view (modified caldwell)?

Answer 4

Exits at the nasion

Question 5

How is the patient positioned for a PA sinus view (modified caldwell)?

Answer 5

Upright PA with nose resting on grid

Question 6

Where is the MSP for a PA sinus view (modified caldwell)?

Answer 6

Perpendicular to IR

Question 7

Where is the OML for a PA sinus view (modified caldwell)?

Answer 7

At 15 degrees with the CR

Question 8

When doing a PA sinus view (modified caldwell), what improves the detail of air/fluid levels?

Answer 8

A horizontal CR

Question 9

Why would you use a horizontal CR for a PA sinus view (modified caldwell)?

Answer 9

To improve detail of air/fluid levels

Question 10

What is another name for a parietoacanthial sinus?

Answer 10

Waters method

Question 11

What is another name for the waters method?

Answer 11

Parietoacanthial sinus

Question 12

What structures are seen for the Parietoacanthial sinus (waters method)?

Answer 12

• Demonstrates the maxillary sinuses best
• Distance between the lateral border of skull and orbit of skull and orbit equal on each side
• Petrous ridges below maxillary sinuses
• Open mouth= Sphenoidal sinuses projected through the open mouth

Question 13

Where is the CR for a Parietoacanthial sinus (waters method)?

Answer 13

Exits the acanthion

Question 14

How is the patient positioned for a Parietoacanthial sinus (waters method)?

Answer 14

• Patient is upright PA
• Chin on the bucky/table
• Nose is 3/4” from the bucky/table

Question 15

Where is the MSP for the Parietoacanthial sinus (waters method)?

Answer 15

Perpendicular to IR

Question 16

Where is the OML for the Parietoacanthial sinus (waters method)?

Answer 16

37 degrees with plane of IR

Question 17

Where is the MML for the Parietoacanthial sinus (waters method)?

Answer 17

Approx. perpendicular to the plane of the IR

Question 18

In what case will the MML not be perpendicular to the IR for a Parietoacanthial sinus (waters method)?

Answer 18

When doing the open mouth waters method

Question 19

What does the patient do for an open-mouth waters method?

Answer 19

The patient is instructed to open their mouth

Question 20

What are the structures seen for a lateral sinus (most affected side only)?

Answer 20

• Demonstrates all sinus groups
• No rotation of sella turcica
• Superimposed orbital roofs and mandibular rami

Question 21

Where is the CR for the lateral sinus (most affected side only)?

Answer 21

1/2” to 1” posterior to outer canthus

Question 22

How is the patient positioned for a lateral sinus (most affected side only)?

Answer 22

• Patient is upright in a RAO/LAO position
• Head in true lateral position

Question 23

Where is the MSP for a lateral sinus (most affected side only)?

Answer 23

Parallel to IR

Question 24

Where is the IP line for a lateral sinus (most affected side only)?

Answer 24

Perpendicular to IR

Question 25

Where is the IOML for a lateral sinus (most affected side only)?

Answer 25

Perpendicular to the front edge of the IR

Question 26

What are the structures seen in a Submentovertical sinus (SMV)?

Answer 26

- Demonstrates the sphenoid and ethmoid sinuses - Anterior frontal bone superimposed by mental protuberance (chin) - Mandibular condyles anterior to petrous pyramids - No rotation of the head

Question 27

Where is the CR for a Submentovertical sinus (SMV)?

Answer 27

- Perpendicular to IOML - Entering at MSP - 3/4" anterior to the level of the EAM

Question 28

Where is the MSP for a Submentovertical sinus (SMV)?

Answer 28

Perpendicular to IR

Question 29

How is the patient positioned for a Submentovertical sinus (SMV)?

Answer 29

- Patient is upright - Head tilted back (vertex on upright bucky)

Question 30

Where is the IOML for a Submentovertical sinus (SMV)?

Answer 30

Parallel with IR

Question 31

What might you have to do to the CR that it enters perpendicular to the IOML for an SMV view?

Answer 31

Angle it

Question 32

Why would you have to angle the CR for a Submentovertical sinus (SMV)?

Answer 32

So that it enters perpendicular to the IOML

Question 33

What IR is used for a PA sinus view (modified caldwell)?

Answer 33

10x12 portrait

Question 34

What SID do you use for a PA sinus view (modified caldwell)?

Answer 34

40" upright bucky

Question 35

What breathing technique is used for a PA sinus view (modified caldwell)?

Answer 35

Suspended respiration

Question 36

What SID is used for the Parietoacanthial sinus (waters method)?

Answer 36

40" upright bucky

Question 37

What IR is used for the Parietoacanthial sinus (waters method)?

Answer 37

10x12 portrait

Question 38

What breathing technique is used for the Parietoacanthial sinus (waters method)?

Answer 38

Suspended respiration

Question 39

What SID us used for a lateral sinus (most affected side only)?

Answer 39

40" upright bucky

Question 40

What IR is used for a lateral sinus (most affected side only)?

Answer 40

10x12 portrait

Question 41

What breathing technique is used for a lateral sinus (most affected side only)?

Answer 41

Suspended respiration

Question 42

What IR is used for a Submentovertical sinus (SMV)?

Answer 42

10x12 transverse

Question 43

What SID is used for a Submentovertical sinus (SMV)?

Answer 43

40" upright bucky

Question 44

What breathing technique is used for a Submentovertical sinus (SMV)?

Answer 44

Suspended respiration