Sinus Positioning Flashcards

1
Q

What’s another name for the PA sinus view?

A

Modified Caldwell method

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2
Q

What another name for the modified Caldwell method?

A

PA sinus

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3
Q

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

A
  • Demonstrates the frontal sinuses and anterior ethmoidal air cells
  • Symmetric petrous ridges, lying in lower 1/3 of orbits
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4
Q

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

A

Exits at the nasion

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5
Q

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

A

Upright PA with nose resting on grid

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6
Q

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

A

Perpendicular to IR

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7
Q

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

A

At 15 degrees with the CR

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8
Q

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

A

A horizontal CR

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9
Q

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

A

To improve detail of air/fluid levels

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10
Q

What is another name for a parietoacanthial sinus?

A

Waters method

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11
Q

What is another name for the waters method?

A

Parietoacanthial sinus

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12
Q

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

A
  • 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
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13
Q

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

A

Exits the acanthion

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14
Q

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

A
  • Patient is upright PA
  • Chin on the bucky/table
  • Nose is 3/4” from the bucky/table
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15
Q

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

A

Perpendicular to IR

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16
Q

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

A

37 degrees with plane of IR

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17
Q

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

A

Approx. perpendicular to the plane of the IR

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18
Q

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

A

When doing the open mouth waters method

19
Q

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

A

The patient is instructed to open their mouth

20
Q

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

A
  • Demonstrates all sinus groups
  • No rotation of sella turcica
  • Superimposed orbital roofs and mandibular rami
21
Q

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

A

1/2” to 1” posterior to outer canthus

22
Q

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

A
  • Patient is upright in a RAO/LAO position
  • Head in true lateral position
23
Q

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

A

Parallel to IR

24
Q

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

A

Perpendicular to IR

25
Q

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

A

Perpendicular to the front edge of the IR

26
Q

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

A
  • 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
27
Q

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

A
  • Perpendicular to IOML
  • Entering at MSP
  • 3/4” anterior to the level of the EAM
28
Q

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

A

Perpendicular to IR

29
Q

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

A
  • Patient is upright
  • Head tilted back (vertex on upright bucky)
30
Q

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

A

Parallel with IR

31
Q

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

32
Q

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

A

So that it enters perpendicular to the IOML

33
Q

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

A

10x12 portrait

34
Q

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

A

40” upright bucky

35
Q

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

A

Suspended respiration

36
Q

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

A

40” upright bucky

37
Q

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

A

10x12 portrait

38
Q

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

A

Suspended respiration

39
Q

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

A

40” upright bucky

40
Q

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

A

10x12 portrait

41
Q

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

A

Suspended respiration

42
Q

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

A

10x12 transverse

43
Q

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

A

40” upright bucky

44
Q

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

A

Suspended respiration