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Where is the IR centered for a lateral projection of the facial bones?
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For a lateral projection of the facial bones, what line is perpendicular to the front edge of the IR?
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Facial Bones-MV
Chapter 21- Test Prep from Class
| Question | Answer |
|---|---|
| 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