Ch. 11 F.B., Nasal, and Orbits Workbook Flashcards
a radiograph of a lateral projection of the facial bones shows the mandibular rami are not superimposed. what positioning error led to this
rotation of skull
for the superoinferior projection of the nasal bones, the IR is placed perp to what line
glabelloalveolar line (GAL)
what CR angle must be used to project the petrous ridges just below the orbital floor with the PA axial (caldwell method) projection
30 degrees
what FB projection best demonstrates inferior orbital rim, maxillae, nasal septum, nasal spine, zygomatic bone and arches
parietoacanthial projection
a radiograph of a parietoacanthial (waters) projection shows the petrous ridges are projected within the maxillary sinuses. is this an acceptable image? if not, what must be done to improve the image during the repeat
no, petrous ridges should be just below the maxillary sinuses. patient’s head needs to be extended more
a radiograph of a superoinferior projection of the nasal bones shows the glabella are superimposed over the nasal bones. what positioning error led to this and how can it be corrected
excessive flexion of the head and neck or incorrect CR angle; CR must be parallel to the GAL
a radiograph of a parietoacanthial projection shows the distance between the msp and the outer orbital margin is not equal. what positioning error is present
rotation of skull
a radiograph of a 30 degree PA axial projection of the facial bones shows the petrous ridges are projected at the level of the inferior orbital margins. is this an acceptable image for this projection. if not, what must be bone to improve the quality of the image during repeat
yes, this image meets evaluation criteria for a 30 degree PA axial
list the proper method name and the common descriptive name for the parietoacanthial oblique projection for the optic foramen
- rhese method
- three-point landing
a patient comes to the radiology department with a clinical history of a deviated nasal septum. which facial bone projection best demonstrates the degree of deviation
PA, PA axial, and parietoacanthial
what are two differences between the lateral projection of the cranium and the lateral projection for the facial bones
- IR is placed in portrait for facial bones and landscape for cranium
- CR is to the zygoma for facial bones and 2” above the EAM for the cranium
what is another term for the second cranial nerve
optic nerve
as part of a study of the zygomatic arches, the tech attempts to perform the smv position, due to the size of the patients shoulders, they are unable to flex their neck adequately to place the ioml parallel to the IR. what other options does the tech have to produce an acceptable smv projection
angle CR to placer it perp to ioml. angle the IR to maintain a perp relationship
which of the following is not a facial bone
- middle nasal conchae
- vomer
- lacrimal bone
- mandible
middle nasal conchae
which facial bones are sometimes called the “cheekbones”
zygomatic or malar bones
what facial bone projection best demonstrates bilateral zygomatic arches
smv projection
which facial bone is associated with the tear ducts
lacrimal bones
which of the processes of the maxilla is considered most superior
frontal process
vertical portion of mandible
ramus
which facial bones form the posterior aspect of the hard palate
horizontal portion of the palatine bones
a ‘free-floating’ zygomatic bone is the frequent result of what fracture
tripod
which facial bone structures are best seen with a parietoacanthial projection
orbits including infraorbital rims, bony nasal septum, maxillae, zygomatic bones and arches
give 2 reasons why projections of facial bones are performed PA rather than AP when possible
- reduces OID of facial bones
- reduces exposure to anterior facial bones and neck structures such as thyroid glands
T/F - both oblique inferosuperior (tangential) projections for the zygomatic arch are generally taken for comparison
true
what is the proper method name for the parietoacanthial projection of the facial bones
waters method
which specific facial bone structures (other than the mandible) are best demonstrated with the smv projection if the correct exposure factors are used (soft tissue tech)
zygomatic arches
the modified parietoacanthial (modified waters) projections requires what line to be perp to the IR. which also places the oml at what angle to the tabletop and IR
- lips-meatal line
- 55 degrees
mandibular angle
gonion
posterior process of the upper ramus
condyloid process
T/F - the oblique inferosuperior (tangential) projection for the zygomatic arch require that the skull be rotated and tilted 15 degrees away from the affected side
false - toward
a patient with a possible fracture of the nasal bones enters the ER, the physician is concerned about deviation of the nasal septum along with possible fracture of nasal bones, what radiographic routine would be best for this
patietoacanthial and right and left lateral projections