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RAD 2 > Orbits Positioning > Flashcards

Orbits Positioning Flashcards

1
Q

What IR is used for orbit views?

A

10x12

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2
Q

What breathing technique is used for orbit views?

A

Suspended respiration

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3
Q

What SID is used for orbit views?

A

40”

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4
Q

What structures are seen for a PA axial orbit view?

A
  • Symmetrical superior orbital fissures demonstrated between the greater and lesser wings of the sphenoid bone
  • Petrous pyramids below inferior margins of the orbits
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5
Q

Whats another name for the optic foramen view orbits?

A

Rhese Method

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6
Q

Whats another name for the rhese method?

A

Optic foramen

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7
Q

What SID is used for orbit views?

A

40”

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8
Q

What IR is used for orbit views?

A

10x12

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9
Q

What are the structures seen for the optic foramen (rhese method) orbits?

A
  • Optic canal and optic foramen visible at end of sphenoid ridge in inferior and lateral quadrant of orbit
  • Entire orbital rim
  • Supraorbital margins on same line
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10
Q

Where is the CR for an optic foramen (rhese method) orbits?

A
  • Enters 1” superior and posterior to the TEA (top of ear attachment)
  • Exits mid orbit on side closest to IR
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11
Q

What breathing technique is used for orbit views?

A

Suspended respiration

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12
Q

How is the patient positioned for an optic foramen (rhese method) orbits?

A

The patient is prone with chin, cheek, and nose resting against the table (3 point landing)

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13
Q

What is a 3 point landing?

A

Where the chin, cheek, and nose are pressed against a surface

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14
Q

What is it called when the chin, cheek, and nose are pressed against a surface?

A

3 point landing

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15
Q

Where is the AML for an optic foramen (rhese method) orbits?

A

Perpendicular to IR

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16
Q

Where is the MSP for an optic foramen (rhese method) orbits?

A
  • 37 degrees from vertical
  • 53 degrees from horizontal
17
Q

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

A
  • Superimposed orbital roofs
  • Demonstrates foreign body
  • Perform upright if suspected blow out fracture or another fracture is noted to rule out blood in the sinus cavity
18
Q

Where is the CR for a lateral orbit view (most affected side only)?

A

Perpendicular to IR centered to outer canthus of eye

19
Q

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

A
  • Patient in RAO or LAO
  • Adjust head to true lateral
  • Instruct patient to look straight ahead
20
Q

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

A

Parallel to plane of IR

21
Q

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

A

perpendicular to the plane of IR

22
Q

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

A

Perpendicular to the edge of IR

23
Q

Whats another name for the parietoacanthial orbits view?

A

Modified waters method

24
Q

What another name for the modified waters method orbits view?

A

parietoacanthial view

25
Q

What are the structures seen for a parietoacanthial (modified waters) orbit view?

A
  • Petrous pyramids lying low below the orbital shadows
  • Symmetrical visualization of orbits
  • Demonstrates localization of foreign body
26
Q

Where is the CR for a parietoacanthial (modified waters) orbit view?

A

Perpendicular to mid-IR exiting the orbits

27
Q

Where is the OML for a parietoacanthial (modified waters) orbit view?

A

50 degrees with IR

28
Q

Where is the MSP for a parietoacanthial (modified waters) orbit view?

A

Perpendicular to IR

29
Q

How is the patient positioned for a parietoacanthial (modified waters) orbit view?

A
  • Patient in PA/prone position
  • Head tilted back with chin resting on table/bucky
  • Patients eyes are closed
30
Q

What structures are seen for a PA axial orbit view?

A
  • Symmetrical superior orbital fissures demonstrated between the greater and lesser wings of the sphenoid bone
  • Petrous pyramids below inferior margins of the orbits
31
Q

How is the patient positioned for a PA axial orbit view?

A

Exits through the center of the orbits

32
Q

Where is the MSP & OML for a PA axial orbit view?

A

Perpendicular to IR

33
Q

How is the patient positioned for a PA axial orbit view?

A
  • Patient is prone/upright
  • Patient rests forehead and nose on table/bucky
  • Patients eyes are closed
34
Q

How much is the CR angled for a PA axial orbit view?

A

30 degrees caudal

35
Q

Whats the difference between a PA caldwell and a PA axial?

A
  • PA caldwell uses a 15 degree caudal angle
  • PA axial used 30 degrees caudal angle
36
Q

What do you do to the kVp for a PA Caldwell orbit view?

A

Increase kVP by 5 to compensate for large CR angle

RAD 2 (36 decks)

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