Skull

A PA cranial projection with accurate positioning demonstrates

1. equal distances from the lateral orbital margin to the lateral cranial cortices on each side.
2. the anterior clinoids and dorsum sellae superior to the ethmoid sinuses.
3. the petrous ridges horizontally through the lowest third of the orbits.
4. the internal acoustic meatus horizontally through the orbital center.

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Terms in this set (20)

1, 2, and 4 only

A poorly positioned SMV cranial projection (Schueller method) demonstrates the mandibular mentum too far anterior to the ethmoid sinuses. How was the positioning setup mispositioned for such a projection to be obtained?

1. The patient's neck was overextended.
2. The IOML was not aligned parallel with the IR.
3. The central ray was angled too caudally.
4. The patient's head was tilted toward the right side.

1 and 2 only

For a PA axial cranial projection (Caldwell method), the

1. midsagittal plane is aligned perpendicular to the IR.
2. central ray is angled 15 degrees caudally.
3. OML is aligned perpendicular to the IR.
4. central ray is centered to exit the nasion.

1, 2, 3, and 4

For a submentovertex (SMV) cranial projection (Schueller method), the

1. central ray is aligned perpendicular to the IR.
2. central ray is centered to the midsagittal plane at a level 0.75 inch (2 cm) anterior to the level of the EAM.
3. IOML is parallel with the IR.
4. midsagittal plane is perpendicular to the IR.

1, 2, 3, and 4

A optimally positioned AP axial cranium projection (Towne method) demonstrates all the following except

the posteror clinoids superior to the foramen magnum.

A lateral cranial projection with accurate positioning demonstrates the

1. sella turcica in profile.
2. right orbital roof slightly superior to the left orbital roof.
3. dorsum sellae within the foramen magnum.
4. mandibular rami superimposed.

1 and 4 only

A poorly positioned AP axial cranial projection (Caldwell method) demonstrates the petrous ridges inferior to the infraorbital margins. How could the positioning setup be adjusted to obtain an optimal projection?

1. Rotate the patient's face toward the left side.
2. Adjust the central ray angulation caudally.
3. Tuck the patient's chin until the OML is perpendicular to the IR.
4. Elevate the patient's chin until the OML is perpendicular to the IR.

2 and 3 only

A poorly positioned parietoacanthial facial bone projection (Waters method) demonstrates the petrous ridges within the maxillary sinuses. How was the positioning setup mispositioned for such a projection to be obtained?

1. The MML was not aligned perpendicular to the IR.
2. The patient's head was rotated toward the left side.
3. The patient's chin was tucked more than needed.
4. The central ray was angled too cephalically.

1, 3, and 4 only

For an AP axial cranial projection (Towne method), the

1. midsagittal plane is aligned with the long axis of the image receptor's longitudinal axis.
2. midsagittal plane is positioned parallel with the IR.
3. midcoronal plane is positioned parallel with the IR.
4. OML is aligned perpendicular to the IR.

1, 3, and 4 only

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 central ray.

1, 2, 3, and 4