Quiz 5 Flashcards
A PA cranial projection obtained with the patient’s face rotated toward the right side demonstrates a greater distance from the
lateral orbital margin to the lateral cranial cortex on the left side than on the right side.
A PA cranial projection with poor positioning demonstrates the petrous ridges too superior to the supraorbital margins. How was the patient positioned for such a projection to be obtained?
1. The patient’s chin was inadequately tucked.
2. The OML was not positioned perpendicular to the IR.
3. The patient’s face was rotated toward the right side.
4. The patient’s head was tilted.
2 only
A patient requires a trauma AP axial cranial projection (Caldwell method). When the central ray is aligned with the OML, the tube angle reads 13 degrees caudad. What central ray angle should be used?
2 degrees cephalad
When the central ray is aligned with a patient’s OML, the tube angle reads 25 degrees caudad. What angulation would you use for this patient for a trauma AP axial (Towne method) cranial projection?
55 degrees caudad
Which of the following pertains to an AP axial (Towne method) cranial projection obtained with the patient’s face rotated toward the left side?
The distance from the dorsum sellae to the posterior clinoid process on the patient’s left side is narrower than on the right side.
A lateral cranial projection demonstrates the EAM and inferior cranial cortices without superimposition. One of each corresponding structure is demonstrated inferior to the other. How was the patient mispositioned for such a projection to be obtained?
The patient’s head was tilted.
A lateral cranial projection with poor positioning demonstrates the greater wings of the sphenoid and anterior cranial cortices without superimposition. One of each of the corresponding structures is demonstrated posterior to the other. How was the patient mispositioned for such a projection to be obtained?
The patient’s head was rotated.
A patient is unable to hyperextend the neck enough for an SMV cranial projection (Schueller method). How should the positioning setup be adjusted for an optimal projection to be obtained?
Align the central ray perpendicular to the IOML.
Which of the following is true of an SMV cranial projection (Schueller method) obtained with the vertex of the patient’s head tilted toward the right side?
The distance from the right mandibular ramus to the lateral cranial cortex is greater than the distance from the left ramus to the lateral cranial cortex.
For a parietoacanthial sinus projection (Waters method), the
1. patient is positioned upright to demonstrate air-fluid levels within the maxillary sinuses.
2. MML is aligned perpendicular to the IR.
3. central ray is centered to the acanthion.
4. OML is at a 37-degree angle with the IR.
1, 2, 3, and 4
A patient is unable to elevate the chin enough for a parietoacanthial facial bone projection (Waters method). How could the positioning setup be adjusted for an optimal projection to be obtained?
Align the central ray parallel with the MML.
An optimal PA cranium projection demonstrates all of the following except
anterior clinoids and dorsum sellae seen inferior to the ethmoid sinuses.
A PA cranium projection demonstrating the petrous ridges superior to the supraorbital margins
was obtained with the patient’s chin tucked more than the required amount.
A less than optimal PA axial cranium projection (Caldwell method) that requires the chin to be elevated to obtain optimal positioning will
demonstrate the petrous ridges and pyramids in the superior half of the orbits.
A optimally positioned AP axial cranium projection (Towne method) demonstrates all of the following except
the posterior clinoids superior to the foramen magnum.
An AP axial cranium projection (Towne method) demonstrating the dorsum sellae superimposing the atlas’s posterior arch
will require the central ray angle to be adjusted caudally until it forms a 30-degree angle with the OML.
The distance from the posterior clinoid process to the lateral foramen magnum is less on the patient’s left side than on the right side on an AP axial cranium projection (Towne method). To obtain an optimal projection,
rotate the patient’s face toward the right side until the midsagittal plane is perpendicular to the IR.
An optimally positioned lateral cranium projection demonstrates all of the following except
the sella turcica on end.
A lateral cranium projection obtained with the top of the patient’s head tilted away from the IR will demonstrate all of the following except the
left side greater wing of the sphenoid inferior to the right side greater wing.
Which of the following statements is not true about an SMV cranium projection (Schueller method)?
If the resulting image demonstrates the mandibular mentum posterior to the ethmoid sinuses, the central ray can be angled caudally to obtain an optimal projection.
A parietoacanthial facial bone projection (Waters method) demonstrating the petrous ridges within the maxillary sinuses
would have been obtained with the patient’s chin insufficiently elevated to align the MML perpendicular to the IR.
