Question 1

For the tangential projection of the zygomatic arch, the head is positioned so that the midsagittal plane is _____ degrees _____ the side being examined.

Accepted Answer

The answer of For the tangential projection of the zygomatic...

Question 2

Trauma patients may arrive in the radiology department with their head immobilized. A reverse Waters method can always be performed on these patients by adjusting the central ray parallel to the _____ line.

Accepted Answer

The answer of Trauma patients may arrive in the radiology...

Question 3

For the submentovertical projection of the zygomatic arches, the central ray is directed perpendicular to the _____ line.

Accepted Answer

The answer of For the submentovertical projection of the zygomatic...

Question 4

For a lateral projection of the facial bones, the central ray will enter:

Accepted Answer

For a lateral projection of the facial bones, the central ray should enter halfway between the outer canthus and the EAM. This will ensure that the facial bones are projected laterally without any overlapping or distortion. Entering at the TMJ or EAM or outer canthus individually, will not provide the desired lateral projection of the facial bones.

Question 5

For the Waters method for the facial bones, the orbitomeatal line is placed at what angle to the IR?

Accepted Answer

The orbitomeatal line is placed at a 37 degree angle to the IR for the Waters method of the facial bones.

Question 6

Letter C in the image below used to evaluate the cranium labels the:

Accepted Answer

The petrous ridge is a bony ridge located on the temporal bone of the skull. It is commonly used as a landmark on brain imaging studies to help identify specific regions of the brain.

Question 7

The lateral projection of the facial bones clearly demonstrates:

Accepted Answer

The answer of The lateral projection of the facial bones...

Question 8

Which facial bones are clearly demonstrated on the parietoacanthial projection (Waters method)?
1)Orbits
2)Maxillae
3)Zygomatic arches

Accepted Answer

The parietoacanthial projection (Waters method) is designed to clearly demonstrate the orbits, maxillae, and zygomatic arches.

Question 9

Which of the following is placed perpendicular to the image receptor for the acanthoparietal projection (reverse Waters method) of the facial bones?

Accepted Answer

The answer of Which of the following is placed perpendicular...

Question 10

Which of the following is true regarding the lateral projection of the nasal bones?
1)MSP is parallel with the tabletop.
2)Both sides are done for comparison.
3)The interpupillary line is perpendicular to the tabletop.

Accepted Answer

The answer of Which of the following is true regarding...

Question 11

Which of the following is(are) true regarding positioning for the Waters method for the facial bones?
1)The orbitomeatal line forms a 37-degree angle with the plane of the IR.
2)The mentomeatal line is perpendicular to the IR plane.
3)The coronal plane is perpendicular to the IR plane.

Accepted Answer

In the Waters method, the orbitomeatal line forms a 37-degree angle with the IR, and the mentomeatal line is perpendicular to the IR. The coronal plane is not perpendicular to the IR in this method.

Question 12

The parietoacanthial projection of the facial bones is commonly called the _____ method.

Accepted Answer

The parietoacanthial projection of the facial bones is commonly called the Waters method. The other projections listed are used for different views of the skull. The Towne method is used for an AP projection of the cranium, the Caldwell method is used for a PA projection of the skull, and the Rhese method is used for a projection of the petrous ridges.

Question 13

Both zygomatic arches can be demonstrated on one projection for which of the following projections?
1)Tangential
2)SMV
3)AP axial

Accepted Answer

The SMV (Submentovertical) and AP axial projections can demonstrate both zygomatic arches on one projection. The tangential projection is typically used to demonstrate one zygomatic arch at a time.

Question 14

For a lateral projection of the facial bones, the image receptor is centered to the:

Accepted Answer

The answer of For a lateral projection of the facial...

Question 15

Which of the following is placed perpendicular to the front edge of the IR for a lateral projection of the facial bones?

Accepted Answer

The infraorbitomeatal line is placed perpendicular to the front edge of the IR for a lateral projection of the facial bones. The other lines listed are used for different projections or orientations. The mentomeatal line is used for AP projections of the skull and facial bones, the acanthiomeatal line is used for lateral projections of the skull, and the orbitomeatal line is used for various CT scans and measurements.

Question 16

Letter D in the image below used to evaluate the cranium labels the:

Accepted Answer

The answer of Letter D in the image below used...

Question 17

The figure below demonstrates the _____ method.

Accepted Answer

The figure demonstrates the Waters method, which is used to visualize the maxillary sinuses.

Question 18

The central-ray angulation for the reverse Waters method is:

Accepted Answer

The reverse Waters method, also known as the acanthioparietal projection, typically uses a central ray that is perpendicular to the image receptor, which means 0 degrees of angulation.

Question 19

The parietoacanthial projection (Waters method) of the facial bones is often modified so that there is less angulation of the facial bones. For this modification, the orbitomeatal line is adjusted to _____ degrees.

Accepted Answer

The answer of The parietoacanthial projection (Waters method) of the...

Question 20

Which of the following is centered to the image receptor for a parietoacanthial projection of the facial bones?

Accepted Answer

The acanthion is centered to the image receptor for a parietoacanthial projection of the facial bones. The na-mento (pronasale) line passes through the acanthion and is perpendicular to the image receptor. The glabella is a point on the forehead between the eyebrows and the mental point is on the mandible, neither of which are used for centering the image receptor in this projection.

Quiz 20: Skull, Facial Bones, and Paranasal Sinuses

For the tangential projection of the zygomatic arch, the head is positioned so that the midsagittal plane is _ degrees _ the side being examined.