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~RADT 133 - Positioning 3 > Paranasal Sinuses > Flashcards

Paranasal Sinuses Flashcards

1
Q

2 sinuses present at birth:

A

Maxillary and ethmoid

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2
Q

4 groups of paranasal sinuses:

A

Frontal, maxillary, ethmoid, sphenoid

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3
Q

Passageways and connections of all the sinuses

A

Osteomeatal complex

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4
Q

CR centering for lateral sinuses

A

midway between outer canthus and EAM

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5
Q

____ perpendicular to IR for lateral sinuses

A

IPL

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6
Q

___ perpendicular to front edge of IR for lateral sinuses

A

IOML

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7
Q

OML aligned ___ degrees from horizontal for PA (Caldwell) sinuses

A

15

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8
Q

CR exits at ____ for PA (Caldwell) sinuses

A

nasion

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9
Q

_____ perpendicular to IR for parietoacanthial (waters) sinuses

A

MML

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10
Q

CR exists at ____ for parietoacanthial (waters) sinuses

A

acanthion

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11
Q

Alternative for SMV to visualize sphenoid sinuses

A

Open mouth Waters

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12
Q

____ parallel to IR for SMV sinuses

A

IOML

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13
Q

CR centering for SMV sinuses

A

2 inches inferior to mandibular symphysis

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14
Q

Chin elevation moves the maxillary sinuses _____ to the petrous ridges.

A

superior

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15
Q

A patient comes to radiology for a sinus series on a cart (gurney). She is unable to stand or sit erect for any of the projections. Which of the following projections will best detect any air/fluid levels present in the maxillary sinuses?

A

Horizontal beam lateral

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16
Q

A patient comes to radiology for a sinus series. She cannot fully extend her head and neck for the submentovertical projection. What else can the technologist do to produce a diagnostic submentovertical projection?

A

Angle the CR to place it perpendicular to IOML.

17
Q

A radiograph of a PA projection of the sinuses reveals that the petrous ridges are projected over the ethmoid sinuses. Which of the following modifications will eliminate this superimposition while not compromising diagnostic quality of the study?

A

Increase extension of the head and neck slightly.

18
Q

A radiograph of a parietoacanthial (Waters method) projection reveals that the petrous ridges are superimposed over the lower 30% of the maxillary sinuses. What specific positioning error (if any) led to this radiographic finding?

A

Insufficient extension of skull and neck

19
Q

T/F: All of the sinuses intercommunicate with each other and with the nasal cavity.

A

True

20
Q

Along with the use of erect positions, what other technical factor is important to demonstrate air/fluid levels in paranasal sinuses?

A

Horizontal CR

21
Q

T/F: Both CT (computed tomography) and MRI (magnetic resonance imaging) can provide reconstructed images in three planes: axial, sagittal, and coronal.

A

True

22
Q

T/F: Infections involving the upper teeth may involve the frontal sinuses.

A

False

23
Q

The ____ sinuses develop last and are not fully developed until the teenage years.

A

Ethmoid

24
Q
A

~RADT 133 - Positioning 3 (6 decks)

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