A Trivia Quiz On Skull Positioning!
Questions and Answers
- 1.
What anatomical position would be used on a Towne method?
- A.
AP
- B.
PA
Correct Answer
A. APExplanation
The anatomical position used on a Towne method is AP, which stands for anteroposterior. This means that the x-ray beam is directed from the front of the patient towards the back, capturing an image of the skull in this position. This is commonly used for imaging the base of the skull and is often used to assess fractures or abnormalities in this area.Rate this question:
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- 2.
An AP Towne using the IOML would use a tube angulation of____ degrees ______
- A.
37 degrees cephalic
- B.
30 degrees cephalic
- C.
37 degrees caudal
- D.
30 degrees caudal
Correct Answer
C. 37 degrees caudalExplanation
pg 411Rate this question:
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- 3.
What must be visualized inside the foramen magnum of an AP Towne projection?
- A.
Mastoid
- B.
Dorsum sellae
- C.
Dens/ Odontoid process
- D.
Lamda
Correct Answer
B. Dorsum sellaeExplanation
The correct answer is Dorsum sellae. The foramen magnum is a large opening at the base of the skull through which the spinal cord passes. In an AP Towne projection, the Dorsum sellae, which is a bony ridge on the inside of the skull, should be visualized within the foramen magnum. This projection is commonly used to visualize the posterior fossa and structures within it, such as the brainstem and cerebellum. The other options mentioned are not typically visualized within the foramen magnum in this projection.Rate this question:
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- 4.
On the lateral skull, the IOML is perpendicular to the____
- A.
IR
- B.
Front edge of the IR
- C.
Floor
- D.
Top edge of IR
Correct Answer
B. Front edge of the IRExplanation
The IOML (infraorbital-meatal line) is a reference line used in radiology to position the skull correctly. In a lateral skull X-ray, the IOML should be perpendicular to the front edge of the image receptor (IR). This means that the IOML should be aligned at a 90-degree angle with the front edge of the IR. This positioning ensures accurate and consistent imaging of the skull structures.Rate this question:
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- 5.
On a lateral skull, the centering is___ the EAM.
- A.
2 inches above
- B.
2 inches below
- C.
1 inch above
- D.
1 inch below
Correct Answer
A. 2 inches aboveExplanation
The correct answer is 2 inches above. This means that when taking a lateral skull X-ray, the centering point should be positioned 2 inches above the external auditory meatus (EAM). This positioning ensures that the X-ray captures the desired area of the skull.Rate this question:
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- 6.
On a PA Caldwell, where does the CR exit?
- A.
Nasion
- B.
Glabella
- C.
Acanthion
- D.
Mental point
Correct Answer
A. NasionExplanation
pg 413Rate this question:
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- 7.
Where are the petrous ridges on a PA Caldwell with a 15 degree caudal angulation?
- A.
Lower 1/3 of orbits
- B.
Fully inside orbits
- C.
Above orbits
- D.
Below orbits
Correct Answer
A. Lower 1/3 of orbitsExplanation
pg 413Rate this question:
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- 8.
What line is perpendicular to the IR in a PA skull with 0 degree angulation?
- A.
OML
- B.
IOML
- C.
MML
- D.
LDL
Correct Answer
A. OMLExplanation
pg 414Rate this question:
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- 9.
The Dens/ Odontoid process is seen inside the foramen magnum on an SMV?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
pg 415Rate this question:
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- 10.
On lateral fascial bones, the CR is centered to halfway between the outer cants and TEA
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the CR (central ray) is not centered halfway between the outer cants (the outer corners of the eyes) and TEA (top of external auditory meatus) on lateral facial bones. The correct positioning for a lateral facial bone x-ray is to place the CR perpendicular to the IR (image receptor) and centered to the midline of the skull. This ensures that the entire facial bone structure is captured in the image.Rate this question:
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- 11.
Check all that are demonstrated on a waters view.
- A.
IOM's
- B.
Nasal septum
- C.
EAM
- D.
Mastoid processes
Correct Answer(s)
A. IOM's
B. Nasal septum
D. Mastoid processesExplanation
A waters view is a radiographic imaging technique used to visualize the facial bones and sinuses. In this view, the IOM's (infraorbital margins), nasal septum, and mastoid processes are demonstrated. The IOM's refer to the bony ridges located below the eyes, the nasal septum is the cartilaginous structure that separates the nostrils, and the mastoid processes are the bony protuberances behind the ears. Therefore, all three structures are visible on a waters view.Rate this question:
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- 12.
Which line is perpendicular to the IR in a waters view?
- A.
MML
- B.
IOML
- C.
OML
- D.
GML
Correct Answer
A. MMLExplanation
The line MML is perpendicular to the IR in a waters view.Rate this question:
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- 13.
In the modified Waters view, which line is perpendicular to the IR?
- A.
IOML
- B.
MSP
- C.
OML
- D.
AML
Correct Answer
B. MSPExplanation
In the modified Waters view, the line that is perpendicular to the IR is the MSP (Mid-Sagittal Plane). This is because the MSP is a vertical line that passes through the midline of the skull and is perpendicular to the IR (Image Receptor). The other lines mentioned, IOML (Infraorbital-Meatal Line), OML (Orbitomeatal Line), and AML (Acanthiomeatal Line), are not perpendicular to the IR in the modified Waters view.Rate this question:
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- 14.
Which facial reference line does not use the EAM?
- A.
GAL
- B.
MML
- C.
GOL
- D.
AML
Correct Answer
A. GALExplanation
The GAL (Glabella to Ala) facial reference line does not use the EAM (External Auditory Meatus). This line is drawn from the glabella (the space between the eyebrows) to the ala (the wing of the nose). The EAM is not included in this reference line as it is not relevant to the measurement or analysis being performed.Rate this question:
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- 15.
What Anatomy is demonstrated on a modified Towne view?
- A.
Zygomatic arches
- B.
Foramen magnum
- C.
Nasal septum
- D.
Orbits
Correct Answer
A. Zygomatic archesExplanation
A modified Towne view is an X-ray imaging technique that allows visualization of the skull. It is commonly used to assess fractures and abnormalities in the cranial region. The zygomatic arches, also known as the cheekbones, are clearly visible in this view. Therefore, the correct answer is zygomatic arches.Rate this question:
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- 16.
Which sinuses are visualized on a lateral sinus view?
- A.
Frontal sinuses
- B.
Ethmoid sinuses
- C.
Maxillary sinuses
- D.
Sphenoid sinuses
Correct Answer(s)
A. Frontal sinuses
B. Ethmoid sinuses
C. Maxillary sinuses
D. Sphenoid sinusesExplanation
pg 436Rate this question:
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- 17.
On a PA Caldwell of the sinuses, the OML is tilted ______
- A.
15 degrees
- B.
30 degrees
- C.
20 degrees
- D.
10 degrees
Correct Answer
A. 15 degreesExplanation
On a PA Caldwell of the sinuses, the OML (Orbitomeatal Line) is tilted 15 degrees. The OML is an imaginary line that connects the external auditory meatus (ear canal) to the infraorbital rim (lower margin of the eye socket). In a PA Caldwell view, the patient's head is tilted backwards, and the X-ray beam is directed from below the patient's skull. This angulation of 15 degrees allows for better visualization of the frontal sinuses and reduces the superimposition of other structures in the image.Rate this question:
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- 18.
Where is the CR centered for an SMV of the skull?
- A.
1 1/2 inches below mandibular symphysis
- B.
2 inches below mandibular symphysis
- C.
1 1/2 inches below EAM
- D.
2 inches below EAM
Correct Answer
A. 1 1/2 inches below mandibular symphysisExplanation
The CR is centered 1 1/2 inches below the mandibular symphysis. This means that the center of the X-ray beam is positioned 1 1/2 inches below the point where the two halves of the lower jaw meet. This is an important landmark for positioning the X-ray beam correctly for imaging the skull.Rate this question:
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- 19.
Where does the CR exit for a open mouth waters view?
- A.
Acanthion
- B.
Nasion
- C.
Glabella
- D.
LML
Correct Answer
A. AcanthionExplanation
The CR exits for an open mouth waters view at the acanthion. The acanthion is the midpoint between the base of the nose and the upper lip. This position allows for visualization of the maxillary sinuses and the surrounding structures.Rate this question:
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- 20.
On the open mouth waters view, the OML forms a ____ degree angle to the IR.
- A.
37
- B.
30
- C.
25
- D.
40
Correct Answer
A. 37Explanation
On the open mouth waters view, the OML (Open Mouth Line) is an imaginary line drawn from the lower border of the upper incisors to the base of the skull. In this view, the OML forms a 37-degree angle to the IR (Image Receptor). This angle is important for proper positioning and alignment of the patient's head during the imaging procedure, ensuring accurate and clear images of the oral cavity and surrounding structures.Rate this question:
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Current Version
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Aug 21, 2023Quiz Edited by
ProProfs Editorial Team -
Aug 15, 2017Quiz Created by
Ryan Emerson
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