Facial Bones Flashcards
Parietoacanthial view (Waters); OML is ___ degrees to IR
37
CR centering for lateral facial bones
Zygoma, midway between outer canthus and EAM
Parietoacanthial view (Waters); ____ is perpendicular to IR
MML
Parietoacanthial view (Waters); CR exits at:
the acanthion
_____ below maxillary sinuses on Waters view
Petrous ridges
OML ___ degrees to IR for modified Waters
55
Modified parietoacanthial view (Waters); ____ is perpendicular to IR
LML
___ perpendicular to IR for PA axial (Caldwell)
OML
CR ___ degrees ___ for PA axial (Caldwell)
15; caudal
Reverse Caldwell: CR is __ degrees ____
15; cephalic
CR 15 degrees cephalic to OML
AP Axial (reverse Caldwell)
Routine projections for nasal bones
Both laterals, Waters
CR centering for lateral nasal bones
1/2 inch inferior to nasion
Tangential nasal bones: center CR to ____ and angle as needed to ensure that it is parallel to ____.
Nasion; GAL
Routine projections for zygomatic arches
SMV, oblique inferosuperior, AP axial (modified Townes)
Rhese method: head rotated ___ degrees toward side of interest
37
CR centering for Rhese method
midpoint of downside orbit
Rotate head ___ degrees toward IR for axiolateral/oblique mandible for BODY
30
Rotate head ___ degrees toward IR for axiolateral/oblique mandible for SYMPHYSIS
45
Rotate head ___ degrees toward IR for axiolateral/oblique mandible for General Survey
10-15
CR angle/head tilt to equal ___ degrees for axiolateral/oblique mandible
25
How many facial bones make up the bony orbit?
4
What primary type of joint movement occurs with the temporomandibular joint?
Bicondylar
The posterior aspect of the orbit is termed the
Apex
Which sinus often produces an air/fluid level indicating a basilar skull fracture?
Sphenoid
Where is the CR centered for a lateral projection of the facial bones?
Zygoma, midway between EAM and outer canthus
Which of the following technical factors do NOT apply to lateral nasal bone projections?
the technologist should not use AEC
the technologist should use a small focal spot
the technologist should use low to medium kVp
all of the above apply
all of the above apply
Which projection best demonstrates the floor of the orbits with minimal distortion?
Modified waters
Why is the chin extended for an axiolateral projection of the mandible?
to prevent superimposition of the cervical spine
A patient enters the ED with a possible fracture of the right zygomatic arch. Which of the following routines would best diagnose a possible fracture of this structure?
Submentovertical, oblique inferosuperior (tangential), and AP axial (Towne method) projections
A patient enters the ED with a possible nasal bone fracture. The physician is concerned about a possible bony nasal septum deviation and fractured nasal bones. Which of the following routines would best diagnose these injuries?
Parietoacanthial, lateral nasal bone, and superoinferior (axial) projections
The Rhese is referred to as a three-point landing. The three points are the:
chin, cheek and nose
The patient is positioned with the IOML perpendicular to the IR. The CR is angled 37 degrees caudal and enters 2.5” superior to the glabella. What projection of the skull is being imaged?
AP axial
The respiration phase for all projections of the skull is
Suspended
What is the angle between the OML and the plane of the image receptor for the parietoacanthial projection for facial bones?
37 degrees
What is the name of the articulation between the frontal bone and the parietal bone?
Coronal suture
What is the name of the articulation between the parietal bones?
Sagittal suture
Which skull projection best demonstrates the occipital bone?
AP axial
