LRA 226 Final Test Questions with
Complete Solutions5
How is rotation evident on a lateral projection of the skull? - ANSWERS-Anterior and posterior
separation of symmetric vertical bilateral structures.
Where is the CR centered for a lateral projection of the cranium? - ANSWERS-Two inches (5 cm)
superior to EAM
What is the difference, in degrees, between the infraorbitomeatal and orbitomeatal lines? -
ANSWERS-7-8 degrees
Which one of the following technical considerations is most critical for demonstrating air and/or
fluid levels within the cranium? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-PA with no CR angulation to OML
The submentovertex projection requires that the inferior OML (IOML) is placed parallel to the
image receptor. - ANSWERS-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. - ANSWERS-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? - ANSWERS-None,
positioning was correct
Which one of the following cranial projections will best demonstrate a possible basilar fracture?
- ANSWERS-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? - ANSWERS-IOML
Which bone is involved with a tripod fracture? - ANSWERS-Zygomatic
A fracture involving the facial bones where a blow to one side causes a fracture to the opposite
side is termed a ____ fracture. - ANSWERS-Contrecoup
Complete Solutions5
How is rotation evident on a lateral projection of the skull? - ANSWERS-Anterior and posterior
separation of symmetric vertical bilateral structures.
Where is the CR centered for a lateral projection of the cranium? - ANSWERS-Two inches (5 cm)
superior to EAM
What is the difference, in degrees, between the infraorbitomeatal and orbitomeatal lines? -
ANSWERS-7-8 degrees
Which one of the following technical considerations is most critical for demonstrating air and/or
fluid levels within the cranium? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-PA with no CR angulation to OML
The submentovertex projection requires that the inferior OML (IOML) is placed parallel to the
image receptor. - ANSWERS-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. - ANSWERS-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? - ANSWERS-None,
positioning was correct
Which one of the following cranial projections will best demonstrate a possible basilar fracture?
- ANSWERS-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? - ANSWERS-IOML
Which bone is involved with a tripod fracture? - ANSWERS-Zygomatic
A fracture involving the facial bones where a blow to one side causes a fracture to the opposite
side is termed a ____ fracture. - ANSWERS-Contrecoup
