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Graded A+
How is rotation evident on a lateral projection of the skull?
Anterior and posterior separation of symmetric vertical bilateral structures.
Where is the CR centered for a lateral projection of the cranium?
Two inches (5 cm) superior to EAM
What is the difference, in degrees, between the infraorbitomeatal and orbitomeatal lines?
7-8 degrees
Which one of the following 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
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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?
nothinng, all anatomy needed was demonstrated
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?
USE IOML increase angulation by 7 degrees
A patient enters the emergency department (ED) with a possible basilar skull fracture. Which of the
following skull projections would best demonstrate any blood present in the sphenoid sinus?
Horizontal Beam Lateral
A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone.
Which of the following projections would best demonstrate this region with a minimal amount of
distortion of the frontal bone?
PA with no CR angulation to OML
The submentovertex projection requires that the inferior OML (IOML) is placed parallel to the image
receptor.
True
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? Anterior and posterior separation of symmetric vertical
bilateral structures.
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Lateral
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?
None, positioning was correct
Which one of the following cranial projections will best demonstrate a possible basilar fracture?
Horizontal beam lateral
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
Which bone is involved with a tripod fracture?
Zygomatic
A fracture involving the facial bones where a blow to one side causes a fracture to the opposite side is
termed a ____ fracture.
Contrecoup
The lateral projection of the facial bones is typically a unilateral projection.
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True
For a lateral facial bones projection, the chin should be adjusted so the IOML is perpendicular to the
front edge of the IR.
True
Where is the CR centered for a lateral projection of the facial bones?
Zygoma, midway between the EAM and the outer canthus
What is the angle between the OML and the plane of the IR for the parietoacanthial (Waters)
projection?
37 degrees
Which is the only movable joint in the skull?
Temporomandibular Ioint
The modified parietoacanthial (modified Waters) projection requires more extension of the head and
neck as compared with the parietoacanthial (Waters) projection.
False
The 15° PA axial (Caldwell) projection produces an unobstructed view of the maxilla.
False
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Graded A
LRA 226 Final Exam Latest 2025 Update
Real Questions with Verified Answers
Graded A+
How is rotation evident on a lateral projection of the skull?
Anterior and posterior separation of symmetric vertical bilateral structures.
Where is the CR centered for a lateral projection of the cranium?
Two inches (5 cm) superior to EAM
What is the difference, in degrees, between the infraorbitomeatal and orbitomeatal lines?
7-8 degrees
Which one of the following 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
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Graded A
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?
nothinng, all anatomy needed was demonstrated
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?
USE IOML increase angulation by 7 degrees
A patient enters the emergency department (ED) with a possible basilar skull fracture. Which of the
following skull projections would best demonstrate any blood present in the sphenoid sinus?
Horizontal Beam Lateral
A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone.
Which of the following projections would best demonstrate this region with a minimal amount of
distortion of the frontal bone?
PA with no CR angulation to OML
The submentovertex projection requires that the inferior OML (IOML) is placed parallel to the image
receptor.
True
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? Anterior and posterior separation of symmetric vertical
bilateral structures.
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Graded A
Lateral
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?
None, positioning was correct
Which one of the following cranial projections will best demonstrate a possible basilar fracture?
Horizontal beam lateral
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
Which bone is involved with a tripod fracture?
Zygomatic
A fracture involving the facial bones where a blow to one side causes a fracture to the opposite side is
termed a ____ fracture.
Contrecoup
The lateral projection of the facial bones is typically a unilateral projection.
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Graded A
True
For a lateral facial bones projection, the chin should be adjusted so the IOML is perpendicular to the
front edge of the IR.
True
Where is the CR centered for a lateral projection of the facial bones?
Zygoma, midway between the EAM and the outer canthus
What is the angle between the OML and the plane of the IR for the parietoacanthial (Waters)
projection?
37 degrees
Which is the only movable joint in the skull?
Temporomandibular Ioint
The modified parietoacanthial (modified Waters) projection requires more extension of the head and
neck as compared with the parietoacanthial (Waters) projection.
False
The 15° PA axial (Caldwell) projection produces an unobstructed view of the maxilla.
False
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