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Facial Bones-MV

Chapter 21- Test Prep from Class

QuestionAnswer
Where is the IR centered for a lateral projection of the facial bones? Lateral surface of the zygomatic bone midway between the outer canthus and the EAM.
For a lateral projection of the facial bones, what line is perpendicular to the front edge of the IR? IOML
Where is the CR directed for a lateral projection of the facial bones? Lateral surface of the zygomatic bone midway between the outer canthus and the EAM
The Parietoacanthial projection of the facial bones is commonly called? Waters Method
For the Waters Method, the OML forms an angle of ____________ to the plane of the IR? 37 degrees
For the Waters method of the facial bones, what line is perpendicular to the plane of the IR? MML
What is centered to the IR for a Waters Method projection of the facial bones? Acanthion
The Waters Method of the facial bones clearly demonstrates what? Orbits, Maxillae and the Zygomatic Arches
Where will the Petrous Ridges be projected for a Waters Method projection of the facial bones? Immediately below the Maxillary Sinuses
For a Modified Waters method of the facial bones the OML will form an angle of ___________ to the plane of the IR. 55 Degrees
The Reverse Waters method is called a _________________________ projection. Acanthioparietal projection
The Modified Waters Method for the facial bones is a good projection to demonstrate what? Blowout fractures
How will the Petrous Ridges appear in a Modified Waters projection of the facial bones? Petrous Ridges projected immediately below the inferior border of the orbits midway through the maxillary sinuses.
What line is perpendicular to the plane of the IR for a Reverse Waters projection? MML
What is the CR angle for a Reverse Waters projection of the facial bones? 0 degrees or perpendicular
For a trauma patient with the head immobilized the Central Ray is parallel to what line for a Reverse Waters projection? Parallel to the MML
A lateral projection of the facial bones will clearly demonstrate what? All facial bones in their entirety with the zygomatic bones in the center and all left and right side bones superimposed
For a lateral projection of the Nasal bones, what line is parallel to the IR? IOML
Which side should be placed against the IR for a lateral projection of the nasal bones? Both sides for comparison
What line should be perpendicular to the IR for a lateral projection of the Nasal bones? Interpupillary line
The PA Axial projection of the facial bones is also called what method? Caldwell
What line is perpendicular with the IR for a Caldwell projection of the facial bones? OML
How is the Central Ray directed for a Caldwell method of the facial bones? 15 Degrees Caudad to exit the nasion
The central ray is perpendicular to what line for the SMV projection of the Zygomatic Arches? IOML
Which projection(s) will demonstrate BOTH Zygomatic Arches? SMV and AP Axial (Modified Townes)
For the Tangential projection of the zygomatic arches how is the head positioned? MSP 15 degrees toward the side of interest
What line should be parallel to the IR for a Tangential projection of the Zygomatic Arches? IOML
For the Tangential projection of the Zygomatic Arches how should the top of the head be positioned? Top of the head tilted 15 degrees AWAY from the side of interest.
For the Tangential projection of the zygomatic arches the CR is perpendicular to what line and enters where? Perpendicular to the IOML (and zygomatic arch) entering 1" posterior to the outer canthus
For the AP Axial projection of the Zygomatic Arches, what line is perpendicular to the IR? OML
For the AP Axial projection of the Zygomatic arches, the CR enters where? Glabella (1" above the nasion)
The AP Axial projection of the Zygomatic Arches has a CR angle of what? 30 degrees Caudad
What is centered to the IR for a PA projection of the Mandibular Rami? Acanthion
Which projections will clearly demonstrate any medial or lateral displacement fractures of the mandibular rami? PA/PA Axial
What is the CR angle for a PA Axial projection of the mandibular rami? 20 to 25 degrees Cephalad to exit the acanthion
What part of the patient's face will touch the IR for a PA or PA Axial projection of the Mandibular Rami? Nose and Forehead
What is the Central Ray angle for an Axiolateral Oblique projection of the Mandible? 25 degrees Cephalad
What line is perpendicular to the IR for an AP Axial projection for the TMJ? OML (& MSP)
What is the CR angle for an AP Axial projection of the TMJ? 35 Degrees Caudad (Centered between the TMJ's and entering 3" above the nasion)
How is the Head positioned to demonstrate the Ramus of the Mandible? True Lateral
How is the Head positioned to demonstrate the Body of the Mandible? Rotate the Head 30 Degrees toward the IR
How is the Head positioned to demonstrate the Symphysis of the Mandible? Rotate the Head 45 degrees toward the IR
What projection will best demonstrate the Condyle and Neck of the Mandible? Axiolateral Oblique projection for the TMJ
The MSP of the head is rotated how much for an Axiolateral Oblique projection of the TMJ? 15 Degrees toward the IR
What is the Central Ray angle for an Axiolateral Oblique projection of the TMJ? 15 Caudad (entering 1.5" superior to the upside EAM)
What should be touching the bucky for a Waters projection? Chin
What line should be as parallel as possible to the plane of the IR for the SMV projection of the zygomatic arches? IOML
The Central Ray should enter at what level for the SMV projection of the Zygomatic Arches? At a level approximately 1" posterior to the Outer Canthus
The Central Ray should enter at what level for the Tangential projection of the Zygomatic Arches? Perpendicular to the IOML and entering at a level approximately 1" posterior to the outer canthus of the side of interest
What line is perpendicular to the IR for the PA and PA Axial projection of the Mandibular Rami? OML
Created by: foster1317
 

 



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