Question 1

All of the following statements about the panoramic tubehead are true except the

Accepted Answer

A)  tubehead rotates the film behind the patient's head.
B)  tubehead rotates behind the patient's head.
C)  vertical angulation of the tubehead is not adjustable.
D)  tubehead houses the filament that produces electrons and target that produces radiographs.

Question 2

Which of the following is not true of a panoramic tubehead?

Accepted Answer

A)  It has a filament that produces electrons and a target that produces radiographs.
B)  The vertical angulation is adjustable.
C)  It always rotates behind the patient's head.
D)  The collimator is a lead plate with an opening shaped like a narrow vertical slit.

Question 3

When a dark radiolucent shadow obscures the apices of the maxillary teeth,the:

Accepted Answer

A)  patient's lips were not closed on the bite-block during the exposure.
B)  patient's tongue was not in contact with the palate during the exposure.
C)  patient's head was posterior to the focal trough.
D)  patient needed to swallow.

Question 4

In panoramic imaging,_____ rotate(s) around the patient.

Accepted Answer

A)  the film/sensor
B)  the tubehead
C)  both the film/sensor and the tubehead
D)  neither the film/sensor nor the tubehead

Question 5

A ghost image will appear _____ than normal and on the _____ side of the image.

Accepted Answer

A)  larger; opposite
B)  larger; same
C)  smaller; opposite
D)  smaller; same

Question 6

A panoramic image allows the dentist to:

Accepted Answer

A)  detect caries.
B)  view the entire dentition and related structures in one film.
C)  view all of the sinus cavities.
D)  do both a and b

Question 7

When a patient does not stand or sit with a straight spine:

Accepted Answer

A)  the panoramic image will be blurred.
B)  an "exaggerated smile line" or curved downward smile line will appear.
C)  detail of the apical regions of the teeth will be lost.
D)  the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information.

Question 8

The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit,to accommodate patients of different sizes.

Accepted Answer

A)  exposure time
B)  vertical angulation
C)  horizontal angulation
D)  milliamperage and kilovoltage

Question 9

A grid:

Accepted Answer

A)  reduces the amount of scatter radiation that reaches the patient.
B)  decreases the contrast of the radiographic image.
C)  decreases the film fog, increasing the contrast of the image.
D)  accomplishes both a and c

Question 10

The skull view that shows the bones of the face and skull and the soft tissue profile is the _____ projection.

Accepted Answer

A)  lateral cephalometric
B)  posteroanterior
C)  magnetic resonance
D)  temporomandibular

Question 11

A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient's:

Accepted Answer

A)  chin was too low.
B)  head was posterior to the focal trough.
C)  lips were not closed on the bite-block during the exposure.
D)  tongue was not in contact with the palate during the exposure. C

Question 12

The main components of the panoramic unit include exposure controls and the:

Accepted Answer

A)  x-ray tubehead.
B)  x-ray tubehead, position-indicator device.
C)  x-ray tubehead, head positioner.
D)  position-indicator device, head positioner.

Question 13

The lead plate in the panoramic tubehead with an opening shaped like a narrow vertical slit is the:

Accepted Answer

A)  exposure control.
B)  cephalostat.
C)  focal trough.
D)  collimator. D

Question 14

A radiopaque,cone-shaped artifact on a panoramic image that interferes with the diagnostic information is caused by the:

Accepted Answer

A)  patient's chin was too high during the procedure.
B)  patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used.
C)  patient's head was posterior to the focal trough.
D)  patient moved during the procedure.

Question 15

When a patient's teeth are not positioned in the groove of the bite-block,the teeth will appear:

Accepted Answer

A)  fat.
B)  skinny.
C)  tall.
D)  short.

Question 16

When a patient's chin is too high during the panoramic exposure:

Accepted Answer

A)  the maxillary premolars will be blurred.
B)  the floor of the nasal cavity will be superimposed over the roots of the mandibular teeth.
C)  a "reverse smile line" will appear on the radiograph.
D)  detail of the mandibular region will be lost.

Question 17

When a patient's chin is positioned too low during the panoramic exposure:

Accepted Answer

A)  the mandibular incisors will appear blurred.
B)  the condyles will not be visible.
C)  detail in the posterior apical regions will be lost.
D)  both a and b occur. D

Question 18

Advantages of panoramic imaging,when contrasted with intraoral imaging,include:

Accepted Answer

A)  less radiation exposure.
B)  no focal trough limitations.
C)  lower equipment cost.
D)  both a and c

Question 19

What new feature of the panoramic unit has allowed better resolution to show better details?

Accepted Answer

A)  Cephalostat
B)  Focal trough
C)  Digital technology
D)  Magnetic resonance

Question 20

A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise,a _____ will appear on the image.

Accepted Answer

A)  dark area
B)  blurred area
C)  ghost image
D)  blurred area and a ghost image

Exam 42: Extraoral Imaging

All of the following statements about the panoramic tubehead are true except the

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Which of the following is not true of a panoramic tubehead?

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When a dark radiolucent shadow obscures the apices of the maxillary teeth,the:

Correct AnswerverifiedShow Answer

In panoramic imaging,_____ rotate(s) around the patient.

Correct AnswerverifiedShow Answer

A ghost image will appear _____ than normal and on the _____ side of the image.

Correct AnswerverifiedShow Answer

A panoramic image allows the dentist to:

Correct AnswerverifiedShow Answer

When a patient does not stand or sit with a straight spine:

Correct AnswerverifiedShow Answer

The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit,to accommodate patients of different sizes.

Correct AnswerverifiedShow Answer

A grid:

Correct AnswerverifiedShow Answer

The skull view that shows the bones of the face and skull and the soft tissue profile is the _____ projection.

Correct AnswerverifiedShow Answer

A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient's:

Correct AnswerverifiedC

The main components of the panoramic unit include exposure controls and the:

Correct AnswerverifiedShow Answer

The lead plate in the panoramic tubehead with an opening shaped like a narrow vertical slit is the:

Correct AnswerverifiedD

A radiopaque,cone-shaped artifact on a panoramic image that interferes with the diagnostic information is caused by the:

Correct AnswerverifiedShow Answer

When a patient's teeth are not positioned in the groove of the bite-block,the teeth will appear:

Correct AnswerverifiedShow Answer

When a patient's chin is too high during the panoramic exposure:

Correct AnswerverifiedShow Answer

When a patient's chin is positioned too low during the panoramic exposure:

Correct AnswerverifiedD

Advantages of panoramic imaging,when contrasted with intraoral imaging,include:

Correct AnswerverifiedShow Answer

What new feature of the panoramic unit has allowed better resolution to show better details?

Correct AnswerverifiedShow Answer

A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise,a _____ will appear on the image.

Correct AnswerverifiedShow Answer

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A ghost image will appear _ than normal and on the _ side of the image.

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C

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D

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D

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