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RAD 2 > Sinus Positioning > Flashcards

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 IR is used for sinus views?

A

10x12

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4
Q

What breathing technique are sinus views taken on?

A

Suspended respiration

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5
Q

What SID is used for sinus views?

A

40”

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6
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 thrid of orbits
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7
Q

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

A

Exits at the nasion

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8
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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9
Q

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

A

Perpendicular to IR

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10
Q

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

A

At 15 degrees with the CR

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11
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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12
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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13
Q

What is another name for a parietoacanthial sinus?

A

Waters method

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14
Q

What is another name for the waters method?

A

Parietoacanthial sinus

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15
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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16
Q

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

A

Exits the acanthion

17
Q

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

A

Patient is upright PA with the chin on the bucky/table and the nose is 3/4” from the bucky/table

18
Q

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

A

Perpendicular to IR

19
Q

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

A

37 degrees with plane of IR

20
Q

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

A

Approx. perpendicular to the plane of the IR

21
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

22
Q

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

A

The patient is instructed to open their mouth

23
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
24
Q

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

A

1/2” to 1” posterior to outer canthus

25
Q

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

A

Patient is upright in a RAO/LAO position with head in true lateral position

26
Q

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

A

Parallel to IR

27
Q

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

A

Perpendicular to IR

28
Q

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

A

Perpendicular to the front edge of the IR

29
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
30
Q

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

A

Perpendicular to IOML, entering at MSP and 3/4” anterior to the level of the EAM

31
Q

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

A

Perpendicular to IR

32
Q

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

A

Patient is upright with head tilted back (vertex on upright bucky)

33
Q

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

A

Parallel with IR

34
Q

What might you have to do to the CR that it enters perpendicular to the IOML?

A

Angle it

35
Q

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

A

So that it enters perpendicular to the IOML

RAD 2 (34 decks)

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