Flashcards in test 4 skull positioning Deck (53)
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How can you tell this is a PA skull?
Petrous ridges fill orbits
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PA SKULL: OML is ______ to IR.
Perpendicular
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PA SKULL: MSP is _______ to IR
Perpendicular
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In a PA skull what is touching the IR
Forehead and nose
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Where does the cr enter or exit on a PA skull?
Exits nasion
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Do you angle on a PA skull?
No angle
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What structures do you see on the PA skull?
⚫️petrous ridges fill orbits
⚫️cristi galli
⚫️frontal bone
⚫️frontal sinuses
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How can you tell this is a PA axial skull?
Petrous ridges in lower third of orbits
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In a PA axial skull: OML is ______ to IR
Perpendicular
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In PA axial skull: MSP is _______ to IR
Perpendicular
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In a PA axial skull what is touching the IR?
Forehead and nose
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In a PA axial skull where the CR enter or exit?
Exits nasion
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Do you angle the CR on a PA axial skull, how much and what direction?
15 degree caudal
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What structures do you see on a PA axial skull?
⚫️petrous ridges in bottom 1/3 of orbits
⚫️cristi galli
⚫️frontal bone
⚫️frontal sinuses
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AP AXIAL SKULL(Townes method) : OML IS _____ To IR.
Or
IOML is ______ to IR
Perpendicular
Perpendicular
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AP AXIAL SKULL (TOWNES METHOD): MSP is ________ to IR.
Perpendicular
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on an AP Axial Skull (Townes) what is touching the IR?
Back of head
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On an AP Axial skull/Townes where do you put the top of the IR?
Skull vertex
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On an AP Axial Skull/Townes where does the CR enter or exit?
Enters 2 1/2 inches above glabella aka the hairline of normal pt
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On an AP axial skull/Townes if using OML then CR angle will be
30 degree caudal
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On an AP Axial Skull/Townes if using an IOML then CR angle will be
37 caudal
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In a AP axial skull/Townes what structures do you see?
⚫️symmetrical petrous ridges
⚫️posterior portion if foramen magnum
⚫️dorsum sellae and posterior clinoid process projected within the foramen magnum
⚫️occipital bone
⚫️posterior portion of parietal bones
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For a trauma AP axial Townes what will the angle be? Direction?
40-60 caudal
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On a SMV (Submentovertical) Schuller Method: IOML ______ with IR
Parallel
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SMV (Submentovertical) Schuller Method: MSP _____ to IR
Perpendicular
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On SMV (Submentovertical) Schuller Method what is touching the IR
Top of head
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On SMV (Submentovertical) Schuller Method where does the CR enter or exit? Need both entrance and exit
Enters MSP of throat between angles of mandible
Exits through a point ¾ inch anterior to level of EAM
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In SMV (Submentovertical) Schuller Method the CR should pass through what structure within the skull?
Sella turcia
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On SMV (Submentovertical) Schuller Method the CR should pass ____ inch anterior the EAM
3/4
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On SMV (Submentovertical) Schuller Method preferably do this with the patient upright or supine?
Upright
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On SMV (Submentovertical) Schuller Method what structures do you see on this image?
•SMV of the cranial base demonstrates symmetrical petrous portions, the mastoid processes
•Ethmoid and sphenoid sinuses
•Mandible
•Nasal Septum
•Dens
•Occipital Bone
•Mandibular condyles anterior to petrous pyramids.
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lateral skull: can you do this image upright or lying on the table?
Seated upright or semi prone
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If you do a lateral skull on the table what position will the patients body be in?
Anterior oblique position
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Lateral skull: MSP is ____ to the IR when doing a lateral skull.
Parallel
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Lateral skull: the interpupillary line is ____ to the IR when doing a lateral skull.
Perpendicular
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The IOML is ____ to the IR when doing a lateral skull.
Parallel
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On a lateral skull the film is LW or CW for this image?
Crosswise
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A right lateral demonstrates____ side and a left lateral demonstrates____ side.
-right
-left
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What Is seen in profile on a lateral skull?
Sella turcia
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What is superimposed on the lateral skull?
⚫️greater wings of sphenoid
⚫️orbital rods
⚫️mastoid regions and EAMs
⚫️mandibular condyles
⚫️TMJS
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On the lateral skull what is touching the IR?
Side of head/ temporAl area
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On a lateral skull where does the CR enter or exit?
Enters 2 inches above EAM
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What structures do you see on the lateral skull?
⚫️sella turcia
⚫️anterior clinoid process
⚫️dorsum sellae
⚫️posterior clinoid process
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To do a trauma lateral skull what extra piece of equipment will you need?
Film holder
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AP/AP axial skull (not Townes) what is the CR?
Axial 15 degree cephalic entering nasion
Ap enters nasion
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Why do we choose to do a PA or PA axial skull vs AP/Ap axial?
The AP is more magnified
46
What does the Haas method show the same as?
Townes method
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What's the CR of the haas method? Angle, entrance, and exit
25 cephalic entering 1 1/2 below EOP
Exiting 1 1/2 inches above nasion
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In the Haas method the OML is ____ to the IR
Perpendicular
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In the Haas method the MSP is ____ to the IR
Perpendicular
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On the haas method what part touches the IR?
Forehead and nose
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Know the structures shown in the Haas method? This is the same as Townes
⚫️occipital region with symmetrical petrous ridges
⚫️dorsum sellae
⚫️posterior clinoid processes within the foramen magnum
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