Powerpoint quiz me Flashcards
Which cranial bone houses the organs for hearing and equilibrium?
temporal bone
The jugular foramen are located on the _____ bone.
temporal bone
which cranial bone makes up the nasal septum?
ethmoid
Which aspect of the skull is most vulnerable to fracture?
Squamous portion of occipital bone
Which landmark(s) corresponds with the level of the petrous ridge?
TEA
The pituitary gland (hypophysis cerebri) is associated with and protected by the _________ bone.
sella turcica/sphenoid
The ethmoid notch is part of which cranial bone?
frontal bone
Which cranial bone possesses the superior nasal conchae?
ethmoid bone
Which cranial bone possesses the zygomatic process?
temporal bone
How is rotation evident on a lateral projection of the skull?
when structure appears anterior or posterior
Which technical considerations is most critical for demonstrating air and/or fluid levels within the cranium?
horizontal x-ray beam
A radiograph of a lateral projection of the cranium reveals that the orbital roofs (plates) are not superimposed—one is slightly superior to the other. Which of the following positioning errors led to this radiographic outcome?
tilt
A radiograph of a lateral cranium reveals that the mentum was cut off from the bottom of the radiograph. A 24 × 30-cm (10 × 12-inch) IR was used, and it was placed crosswise. What must be altered if a repeat exposure is performed?
IR must be placed lengthwise
A patient comes to radiology for a routine study of the cranium. He is unable to flex his head and neck sufficiently to place the OML perpendicular to the IR for the AP axial projection. What should the technologist do to compensate for this problem without creating excessive magnification of the occipital bone?
Alignment must change from OML to IOML and EAM (IOML perpendicular to IR), while using a tube angle of 37 degrees caudal
A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone. Which projection(s) would best demonstrate this region with a minimal amount of distortion of the frontal bone?
PA axial with a tube angle of 15 degrees caudal
A radiograph of a posteroanterior (PA) axial projection (Caldwell method) of the cranium reveals that the petrous ridges are located at the level of the lower one third of the orbits. The technologist performed this projection with the CR angled 15° caudal to the orbitomeatal line (OML). How must positioning be altered if a repeat exposure is performed?
Nothing, the position is correct
Which cranial projection(s) will best demonstrate a possible basilar fracture?
SMV
Which positioning line should be perpendicular to the plane of the IR for the AP axial (Towne) projection with a 37° caudad CR angle?
IOML and EAM
Which positioning error most often results in a repeat exposure of a cranial position?
rotation
The anterior nasal spine is an aspect of the ____ bone
maxillary
Which cranial bone makes up an aspect of the bony nasal septum?
ethmoid
The palatine process is an aspect of the ____ bone
maxillary
The point of union between both halves of the mandible is termed
symphysis menti
Which of the following bones makes up most of the lateral wall of the orbit?
zygomatic
There is a ___ difference between the orbitomeatal and infraorbitomeatal lines
7-8 degrees
Which bones of the skull articulate with 5 cranial bones?
parietal bone
true or false: Metastatic osteoblastic lesions of the cranium are proliferative bony lesions of
increased density
true
Which projection of the skull will best demonstrate signs of a pituitary adenoma?
AP Axial Towne
How much CR angle is required for the AP axial projection of the skull if the IOML is perpendicular to the IR?
37 degrees
A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone. Which projection would best demonstrate this region with a minimal amount of distortion of the frontal bone?
PA projection of the skull
What projection of the skull requires the sagittal plane to be parallel to the image receptor (IR) and the interpupillary line to be perpendicular to the IR?
lateral
Where are the petrous ridges shown on a 0 degree PA view?
at the level of the supraorbital margin
Where are the petrous ridges shown on a 15 degree Caldwell PA view?
lower 1/3 of the orbits
Which variation of the PA (axial) projection of the skull has been performed if the petrous ridges are at the level of the supraorbital margin?
PA 0 degrees
Which positioning error is present if the mandibular condyles are seen within the petrous portion of the temporal bone on an SMV projection?
insufficient extension
A fracture of the floor of the orbit due to a direct strike to the base is termed a
blowout fracture
What is the positioning error for a parietoacanthial projection if the petrous ridges are within the maxillary sinuses?
excessive flexion
A radiograph of a PA Caldwell projection reveals that the petrous ridges are projected into the lower one third of the maxillary sinuses. Which modification(s) should be made during the repeat exposure to produce a more diagnostic image?
decrease extension of the head
The modified Law method for TMJs requires a ____ rotation of the skull and a ____ angle of the CR.
15 degree;15 degree caudad
Which skull positioning line is perpendicular to the IR for a superoinferior tangential (axial) projection of the nasal bones?
GAL
Why is the chin extended for an axiolateral oblique projection of the mandible?
to prevent superimposition of the gonion with the cervical spine
What is the angle between the MSP and the plane of the IR (from a lateral position) for the parietoorbital oblique projection for the optic foramen?
53 degrees
How much must the skull be rotated from a lateral
position to best demonstrate the body of the mandible for the axiolateral oblique projection?
30 degrees
How much is the CR angled for an AP axial projection of the mandible if the IOML is perpendicular to the IR?
42 degrees
true or false: The axiolateral oblique (modified Law) projection for TMJ requires a CR angle of 15° caudad and a 15° downward rotation of the skull from a lateral skull position.
true
Which aspect of the skull is most vulnerable to fracture?
Squamous portion of occipital bone
A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone. Which projection would best demonstrate this region with a minimal amount of distortion of the frontal bone?
PA axial with a 25 degree caudal
